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HomeMy WebLinkAboutSD-23-10 - Supplemental - 0255 Kennedy Drive (42)WQv Grass Channels, Pond A, Infiltration A Unchanged Infiltration Trenches Unchanged 34S SWMA38S GCA1 39S GCA2 40S GCA3 75S CB63/64 76S CB65/66 77S CB66/67 78S CB65A/66A 103S SWMB 128S SWMC 35R GC-A1 36R GC-A2 37R GC-A3 37P Pond A 38P Infiltration A 79P Infiltration Trench63 80P Infiltration Trench65 81P Infiltration Trench67 82P Infiltration Trench65A 127P GravelWet1 129P GravelWet2 49L Study2 67L SN4 Routing Diagram for Hillside2020-postPrepared by Krebs & Lansing Consulting Engineers, Inc., Printed 9/15/2021 HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 2HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Project Notes Hillside @ O'Brien Farm Eldredge Street, Kennedy Drive, Old Farm Road South Burlington, Vermont Post Development Stormwater Model Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 3HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 6.330 39 >75% Grass cover, Good, HSG A (34S, 38S, 39S, 40S, 75S, 76S, 77S, 78S) 0.370 61 >75% Grass cover, Good, HSG B (34S) 3.520 74 >75% Grass cover, Good, HSG C (34S) 4.160 80 >75% Grass cover, Good, HSG D (34S, 38S, 39S) 4.670 98 Paved parking, HSG A (34S, 75S, 76S, 77S, 78S) 3.810 98 Roofs, HSG A (34S, 38S, 39S, 40S) 0.200 98 Water Surface, 0% imp, HSG A (34S) 0.730 30 Woods, Good, HSG A (34S, 38S, 39S) 0.910 77 Woods, Good, HSG D (34S, 38S, 39S) 9.120 96 Workbook (103S, 128S) 33.820 79 TOTAL AREA Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 4HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Time span=0.00-128.00 hrs, dt=0.01 hrs, 12801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=20.360 ac Runoff Depth=0.30"Subcatchment 34S: SWMA Flow Length=1,465' Tc=6.8 min CN=74 Runoff=9.48 cfs 0.515 af Runoff Area=1.940 ac Runoff Depth=0.15"Subcatchment 38S: GCA1 Flow Length=168' Tc=4.5 min CN=67 Runoff=0.42 cfs 0.024 af Runoff Area=1.200 ac Runoff Depth=0.14"Subcatchment 39S: GCA2 Flow Length=138' Tc=4.5 min CN=51 Runoff=0.28 cfs 0.014 af Runoff Area=0.650 ac Runoff Depth=0.54"Subcatchment 40S: GCA3 Tc=1.0 min CN=79 Runoff=0.67 cfs 0.029 af Runoff Area=0.170 ac Runoff Depth=0.65"Subcatchment 75S: CB63/64 Tc=1.0 min CN=88 Runoff=0.21 cfs 0.009 af Runoff Area=0.100 ac Runoff Depth=0.63"Subcatchment 76S: CB65/66 Tc=1.0 min CN=86 Runoff=0.12 cfs 0.005 af Runoff Area=0.170 ac Runoff Depth=0.65"Subcatchment 77S: CB66/67 Tc=1.0 min CN=88 Runoff=0.21 cfs 0.009 af Runoff Area=0.110 ac Runoff Depth=0.65"Subcatchment 78S: CB65A/66A Tc=1.0 min CN=87 Runoff=0.14 cfs 0.006 af Runoff Area=2.060 ac Runoff Depth=0.63"Subcatchment 103S: SWMB Tc=4.1 min CN=96 Runoff=2.42 cfs 0.108 af Runoff Area=7.060 ac Runoff Depth=0.63"Subcatchment 128S: SWMC Tc=4.3 min CN=96 Runoff=8.25 cfs 0.371 af Avg. Flow Depth=0.12' Max Vel=0.30 fps Inflow=0.42 cfs 0.024 afReach 35R: GC-A1 n=0.120 L=440.0' S=0.0107 '/' Capacity=9.42 cfs Outflow=0.19 cfs 0.024 af Avg. Flow Depth=0.11' Max Vel=0.39 fps Inflow=0.28 cfs 0.014 afReach 36R: GC-A2 n=0.150 L=252.0' S=0.0321 '/' Capacity=9.60 cfs Outflow=0.19 cfs 0.014 af Avg. Flow Depth=0.21' Max Vel=0.41 fps Inflow=0.67 cfs 0.029 afReach 37R: GC-A3 n=0.125 L=520.0' S=0.0121 '/' Capacity=5.84 cfs Outflow=0.31 cfs 0.029 af Peak Elev=332.01' Storage=34,201 cf Inflow=9.60 cfs 0.582 afPond 37P: Pond A Outflow=1.91 cfs 0.582 af Peak Elev=331.01' Storage=62 cf Inflow=1.91 cfs 0.582 afPond 38P: Infiltration A Discarded=1.91 cfs 0.582 af Primary=0.00 cfs 0.000 af Outflow=1.91 cfs 0.582 af Peak Elev=347.67' Storage=82 cf Inflow=0.21 cfs 0.009 afPond 79P: Infiltration Trench63 Discarded=0.06 cfs 0.009 af Primary=0.00 cfs 0.000 af Outflow=0.06 cfs 0.009 af Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 5HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Peak Elev=334.52' Storage=36 cf Inflow=0.12 cfs 0.005 afPond 80P: Infiltration Trench65 Discarded=0.04 cfs 0.005 af Primary=0.00 cfs 0.000 af Outflow=0.04 cfs 0.005 af Peak Elev=29.21' Storage=90 cf Inflow=0.21 cfs 0.009 afPond 81P: Infiltration Trench67 Discarded=0.06 cfs 0.009 af Primary=0.00 cfs 0.000 af Outflow=0.06 cfs 0.009 af Peak Elev=341.54' Storage=52 cf Inflow=0.14 cfs 0.006 afPond 82P: Infiltration Trench65A Discarded=0.04 cfs 0.006 af Primary=0.00 cfs 0.000 af Outflow=0.04 cfs 0.006 af Peak Elev=327.23' Storage=4,903 cf Inflow=2.42 cfs 0.108 afPond 127P: GravelWet1 Outflow=0.06 cfs 0.108 af Peak Elev=332.00' Storage=17,429 cf Inflow=8.25 cfs 0.371 afPond 129P: GravelWet2 Outflow=0.18 cfs 0.371 af Inflow=0.24 cfs 0.479 afLink 49L: Study2 Primary=0.24 cfs 0.479 af Inflow=0.24 cfs 0.479 afLink 67L: SN4 Primary=0.24 cfs 0.479 af Total Runoff Area = 33.820 ac Runoff Volume = 1.090 af Average Runoff Depth = 0.39" Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 6HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 34S: SWMA Runoff = 9.48 cfs @ 11.98 hrs, Volume= 0.515 af, Depth= 0.30" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr WQv-1inch Rainfall=1.00" Area (ac) CN Description 2.880 98 Roofs, HSG A 4.220 98 Paved parking, HSG A 0.200 98 Water Surface, 0% imp, HSG A 5.250 39 >75% Grass cover, Good, HSG A 0.370 61 >75% Grass cover, Good, HSG B 3.520 74 >75% Grass cover, Good, HSG C 3.770 80 >75% Grass cover, Good, HSG D 0.020 30 Woods, Good, HSG A 0.130 77 Woods, Good, HSG D 20.360 74 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.2 20 0.0500 0.10 Sheet Flow, yard Grass: Dense n= 0.240 P2= 2.30" 1.8 220 0.0160 2.04 Shallow Concentrated Flow, swale Unpaved Kv= 16.1 fps 1.8 1,225 0.0450 11.17 13.70 Pipe Channel, Piped 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 6.8 1,465 Total Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 7HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcatchment 34S: SWMA Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr WQv-1inch Rainfall=1.00" Runoff Area=20.360 ac Runoff Volume=0.515 af Runoff Depth=0.30" Flow Length=1,465' Tc=6.8 min CN=74 9.48 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 8HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 38S: GCA1 Runoff = 0.42 cfs @ 11.96 hrs, Volume= 0.024 af, Depth= 0.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr WQv-1inch Rainfall=1.00" Area (ac) CN Description 0.290 98 Roofs, HSG A 0.320 30 Woods, Good, HSG A 0.680 77 Woods, Good, HSG D 0.320 39 >75% Grass cover, Good, HSG A 0.330 80 >75% Grass cover, Good, HSG D 1.940 67 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 140 0.2000 7.20 Shallow Concentrated Flow, shallow Unpaved Kv= 16.1 fps 4.5 168 Total Subcatchment 38S: GCA1 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr WQv-1inch Rainfall=1.00" Runoff Area=1.940 ac Runoff Volume=0.024 af Runoff Depth=0.15" Flow Length=168' Tc=4.5 min CN=67 0.42 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 9HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 39S: GCA2 Runoff = 0.28 cfs @ 11.95 hrs, Volume= 0.014 af, Depth= 0.14" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr WQv-1inch Rainfall=1.00" Area (ac) CN Description 0.200 98 Roofs, HSG A 0.390 30 Woods, Good, HSG A 0.100 77 Woods, Good, HSG D 0.450 39 >75% Grass cover, Good, HSG A 0.060 80 >75% Grass cover, Good, HSG D 1.200 51 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 110 0.1090 5.32 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.5 138 Total Subcatchment 39S: GCA2 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr WQv-1inch Rainfall=1.00" Runoff Area=1.200 ac Runoff Volume=0.014 af Runoff Depth=0.14" Flow Length=138' Tc=4.5 min CN=51 0.28 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 10HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 40S: GCA3 Runoff = 0.67 cfs @ 11.91 hrs, Volume= 0.029 af, Depth= 0.54" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr WQv-1inch Rainfall=1.00" Area (ac) CN Description 0.440 98 Roofs, HSG A 0.210 39 >75% Grass cover, Good, HSG A 0.650 79 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 40S: GCA3 Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr WQv-1inch Rainfall=1.00" Runoff Area=0.650 ac Runoff Volume=0.029 af Runoff Depth=0.54" Tc=1.0 min CN=79 0.67 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 11HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 75S: CB63/64 Undeveloped area draining to Pond 2 Runoff = 0.21 cfs @ 11.91 hrs, Volume= 0.009 af, Depth= 0.65" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr WQv-1inch Rainfall=1.00" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 75S: CB63/64 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr WQv-1inch Rainfall=1.00" Runoff Area=0.170 ac Runoff Volume=0.009 af Runoff Depth=0.65" Tc=1.0 min CN=88 0.21 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 12HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 76S: CB65/66 Undeveloped area draining to Pond 2 Runoff = 0.12 cfs @ 11.91 hrs, Volume= 0.005 af, Depth= 0.63" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr WQv-1inch Rainfall=1.00" Area (ac) CN Description 0.080 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.100 86 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 76S: CB65/66 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr WQv-1inch Rainfall=1.00" Runoff Area=0.100 ac Runoff Volume=0.005 af Runoff Depth=0.63" Tc=1.0 min CN=86 0.12 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 13HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 77S: CB66/67 Undeveloped area draining to Pond 2 Runoff = 0.21 cfs @ 11.91 hrs, Volume= 0.009 af, Depth= 0.65" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr WQv-1inch Rainfall=1.00" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 77S: CB66/67 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr WQv-1inch Rainfall=1.00" Runoff Area=0.170 ac Runoff Volume=0.009 af Runoff Depth=0.65" Tc=1.0 min CN=88 0.21 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 14HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 78S: CB65A/66A Undeveloped area draining to Pond 2 Runoff = 0.14 cfs @ 11.91 hrs, Volume= 0.006 af, Depth= 0.65" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr WQv-1inch Rainfall=1.00" Area (ac) CN Description 0.090 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.110 87 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 78S: CB65A/66A Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Type II 24-hr WQv-1inch Rainfall=1.00" Runoff Area=0.110 ac Runoff Volume=0.006 af Runoff Depth=0.65" Tc=1.0 min CN=87 0.14 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 15HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 103S: SWMB Runoff = 2.42 cfs @ 11.95 hrs, Volume= 0.108 af, Depth= 0.63" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr WQv-1inch Rainfall=1.00" Area (ac) CN Description * 2.060 96 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.1 Direct Entry, Workbook- Lag Subcatchment 103S: SWMB Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)2 1 0 Type II 24-hr WQv-1inch Rainfall=1.00" Runoff Area=2.060 ac Runoff Volume=0.108 af Runoff Depth=0.63" Tc=4.1 min CN=96 2.42 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 16HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 128S: SWMC Runoff = 8.25 cfs @ 11.95 hrs, Volume= 0.371 af, Depth= 0.63" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr WQv-1inch Rainfall=1.00" Area (ac) CN Description * 7.060 96 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.3 Direct Entry, Workbook-Lag Subcatchment 128S: SWMC Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)9 8 7 6 5 4 3 2 1 0 Type II 24-hr WQv-1inch Rainfall=1.00" Runoff Area=7.060 ac Runoff Volume=0.371 af Runoff Depth=0.63" Tc=4.3 min CN=96 8.25 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 17HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 35R: GC-A1 Inflow Area = 1.940 ac, Inflow Depth = 0.15" for WQv-1inch event Inflow = 0.42 cfs @ 11.96 hrs, Volume= 0.024 af Outflow = 0.19 cfs @ 12.45 hrs, Volume= 0.024 af, Atten= 54%, Lag= 29.8 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.30 fps, Min. Travel Time= 24.6 min Avg. Velocity = 0.08 fps, Avg. Travel Time= 88.0 min Peak Storage= 285 cf @ 12.04 hrs Average Depth at Peak Storage= 0.12' Bank-Full Depth= 1.08' Flow Area= 8.9 sf, Capacity= 9.42 cfs 5.00' x 1.08' deep channel, n= 0.120 Side Slope Z-value= 3.0 '/' Top Width= 11.48' Length= 440.0' Slope= 0.0107 '/' Inlet Invert= 361.70', Outlet Invert= 357.00' ‡ Reach 35R: GC-A1 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=1.940 ac Avg. Flow Depth=0.12' Max Vel=0.30 fps n=0.120 L=440.0' S=0.0107 '/' Capacity=9.42 cfs 0.42 cfs 0.19 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 18HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 36R: GC-A2 Inflow Area = 1.200 ac, Inflow Depth = 0.14" for WQv-1inch event Inflow = 0.28 cfs @ 11.95 hrs, Volume= 0.014 af Outflow = 0.19 cfs @ 12.19 hrs, Volume= 0.014 af, Atten= 30%, Lag= 14.2 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.39 fps, Min. Travel Time= 10.6 min Avg. Velocity = 0.10 fps, Avg. Travel Time= 42.0 min Peak Storage= 124 cf @ 12.01 hrs Average Depth at Peak Storage= 0.11' Bank-Full Depth= 1.00' Flow Area= 7.0 sf, Capacity= 9.60 cfs 4.00' x 1.00' deep channel, n= 0.150 Side Slope Z-value= 3.0 '/' Top Width= 10.00' Length= 252.0' Slope= 0.0321 '/' Inlet Invert= 365.10', Outlet Invert= 357.00' ‡ Reach 36R: GC-A2 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=1.200 ac Avg. Flow Depth=0.11' Max Vel=0.39 fps n=0.150 L=252.0' S=0.0321 '/' Capacity=9.60 cfs 0.28 cfs 0.19 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 19HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 37R: GC-A3 Inflow Area = 0.650 ac, Inflow Depth = 0.54" for WQv-1inch event Inflow = 0.67 cfs @ 11.91 hrs, Volume= 0.029 af Outflow = 0.31 cfs @ 12.33 hrs, Volume= 0.029 af, Atten= 54%, Lag= 25.2 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.41 fps, Min. Travel Time= 21.1 min Avg. Velocity = 0.09 fps, Avg. Travel Time= 93.1 min Peak Storage= 396 cf @ 11.98 hrs Average Depth at Peak Storage= 0.21' Bank-Full Depth= 1.00' Flow Area= 6.0 sf, Capacity= 5.84 cfs 3.00' x 1.00' deep channel, n= 0.125 Side Slope Z-value= 3.0 '/' Top Width= 9.00' Length= 520.0' Slope= 0.0121 '/' Inlet Invert= 342.67', Outlet Invert= 336.40' ‡ Reach 37R: GC-A3 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.650 ac Avg. Flow Depth=0.21' Max Vel=0.41 fps n=0.125 L=520.0' S=0.0121 '/' Capacity=5.84 cfs 0.67 cfs 0.31 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 20HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 37P: Pond A Inflow Area = 24.150 ac, Inflow Depth = 0.29" for WQv-1inch event Inflow = 9.60 cfs @ 11.98 hrs, Volume= 0.582 af Outflow = 1.91 cfs @ 12.21 hrs, Volume= 0.582 af, Atten= 80%, Lag= 13.7 min Primary = 1.91 cfs @ 12.21 hrs, Volume= 0.582 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 331.25' Surf.Area= 13,348 sf Storage= 23,564 cf Peak Elev= 332.01' @ 12.21 hrs Surf.Area= 14,589 sf Storage= 34,201 cf (10,638 cf above start) Plug-Flow detention time= 1,642.7 min calculated for 0.041 af (7% of inflow) Center-of-Mass det. time= 193.2 min ( 998.8 - 805.6 ) Volume Invert Avail.Storage Storage Description #1 327.25' 120,624 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 327.25 37 0 0 327.75 2,014 513 513 328.00 2,516 566 1,079 329.00 4,793 3,655 4,734 330.00 6,677 5,735 10,469 331.00 12,941 9,809 20,278 332.00 14,567 13,754 34,032 333.00 16,466 15,517 49,548 334.00 18,587 17,527 67,075 335.00 20,824 19,706 86,780 336.00 23,135 21,980 108,760 336.50 24,321 11,864 120,624 Device Routing Invert Outlet Devices #1 Primary 331.15'15.0" Round Culvert L= 20.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 331.15' / 331.00' S= 0.0075 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 331.25'12.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 332.75'48.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 #4 Primary 335.75'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Primary OutFlow Max=1.91 cfs @ 12.21 hrs HW=332.01' (Free Discharge) 1=Culvert (Passes 1.91 cfs of 2.02 cfs potential flow) 2=Orifice/Grate (Orifice Controls 1.91 cfs @ 2.97 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 21HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 37P: Pond A Inflow Primary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)10 9 8 7 6 5 4 3 2 1 0 Inflow Area=24.150 ac Peak Elev=332.01' Storage=34,201 cf 9.60 cfs 1.91 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 22HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 38P: Infiltration A Inflow Area = 24.150 ac, Inflow Depth = 0.29" for WQv-1inch event Inflow = 1.91 cfs @ 12.21 hrs, Volume= 0.582 af Outflow = 1.91 cfs @ 12.22 hrs, Volume= 0.582 af, Atten= 0%, Lag= 0.6 min Discarded = 1.91 cfs @ 12.22 hrs, Volume= 0.582 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 331.01' @ 12.22 hrs Surf.Area= 7,025 sf Storage= 62 cf Plug-Flow detention time= 0.5 min calculated for 0.582 af (100% of inflow) Center-of-Mass det. time= 0.5 min ( 999.3 - 998.8 ) Volume Invert Avail.Storage Storage Description #1 331.00' 27,230 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 331.00 7,013 0 0 332.00 8,357 7,685 7,685 333.00 9,758 9,058 16,743 334.00 11,216 10,487 27,230 Device Routing Invert Outlet Devices #1 Discarded 331.00'40.000 in/hr Exfiltration over Surface area below 331.01' #2 Primary 331.75'6.0" Vert. Orifice/Grate C= 0.600 #3 Primary 333.25'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Discarded OutFlow Max=6.50 cfs @ 12.22 hrs HW=331.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 6.50 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=331.00' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 23HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 38P: Infiltration A Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)2 1 0 Inflow Area=24.150 ac Peak Elev=331.01' Storage=62 cf 1.91 cfs1.91 cfs1.91 cfs 0.00 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 24HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 79P: Infiltration Trench63 Inflow Area = 0.170 ac, Inflow Depth = 0.65" for WQv-1inch event Inflow = 0.21 cfs @ 11.91 hrs, Volume= 0.009 af Outflow = 0.06 cfs @ 11.70 hrs, Volume= 0.009 af, Atten= 72%, Lag= 0.0 min Discarded = 0.06 cfs @ 11.70 hrs, Volume= 0.009 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 347.67' @ 12.00 hrs Surf.Area= 102 sf Storage= 82 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 5.8 min ( 785.7 - 780.0 ) Volume Invert Avail.Storage Storage Description #1 352.80' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 346.18' 72 cf 3.25'W x 31.50'L x 2.42'H Field A 248 cf Overall - 67 cf Embedded = 181 cf x 40.0% Voids #3A 346.51' 54 cf ADS N-12 18 x 2 Inside #2 Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= -10.00' x 1.80 sf x 1 rows 156 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 352.80 20 0 0 353.30 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 346.18'25.000 in/hr Exfiltration over Surface area below 346.19' #2 Primary 348.09'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.06 cfs @ 11.70 hrs HW=346.26' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.06 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=346.18' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 25HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 79P: Infiltration Trench63 - Chamber Wizard Field A Chamber Model = ADS N-12 18 (ADS N-12® Pipe) Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= -10.00' x 1.80 sf x 1 rows 2 Chambers/Row x 20.00' Long -10.00' Row Adjustment = 30.00' Row Length +9.0" End Stone x 2 = 31.50' Base Length 1 Rows x 21.0" Wide + 9.0" Side Stone x 2 = 3.25' Base Width 4.0" Base + 21.0" Chamber Height + 4.0" Cover = 2.42' Field Height 2 Chambers x 36.0 cf -10.00' Row Adjustment x 1.80 sf x 1 Rows = 54.0 cf Chamber Storage 2 Chambers x 44.5 cf -10.00' Row Adjustment x 2.23 sf x 1 Rows = 66.8 cf Displacement 247.5 cf Field - 66.8 cf Chambers = 180.7 cf Stone x 40.0% Voids = 72.3 cf Stone Storage Chamber Storage + Stone Storage = 126.3 cf = 0.003 af Overall Storage Efficiency = 51.0% 2 Chambers 9.2 cy Field 6.7 cy Stone Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 26HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 79P: Infiltration Trench63 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.170 ac Peak Elev=347.67' Storage=82 cf 0.21 cfs 0.06 cfs0.06 cfs 0.00 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 27HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 80P: Infiltration Trench65 Inflow Area = 0.100 ac, Inflow Depth = 0.63" for WQv-1inch event Inflow = 0.12 cfs @ 11.91 hrs, Volume= 0.005 af Outflow = 0.04 cfs @ 11.75 hrs, Volume= 0.005 af, Atten= 64%, Lag= 0.0 min Discarded = 0.04 cfs @ 11.75 hrs, Volume= 0.005 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Peak Elev= 334.52' @ 11.99 hrs Surf.Area= 76 sf Storage= 36 cf Plug-Flow detention time= 3.2 min calculated for 0.005 af (100% of inflow) Center-of-Mass det. time= 3.2 min ( 783.2 - 780.0 ) Volume Invert Avail.Storage Storage Description #1 339.60' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 333.52' 54 cf 3.25'W x 23.50'L x 2.42'H Field A 185 cf Overall - 49 cf Embedded = 136 cf x 40.0% Voids #3A 333.85' 40 cf ADS N-12 18 Inside #2 Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= +2.00' x 1.80 sf x 1 rows 124 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 339.60 20 0 0 340.10 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 333.52'25.000 in/hr Exfiltration over Surface area below 333.53' #2 Primary 335.35'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.04 cfs @ 11.75 hrs HW=333.59' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=333.52' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 28HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 80P: Infiltration Trench65 - Chamber Wizard Field A Chamber Model = ADS N-12 18 (ADS N-12® Pipe) Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= +2.00' x 1.80 sf x 1 rows 1 Chambers/Row x 20.00' Long +2.00' Row Adjustment = 22.00' Row Length +9.0" End Stone x 2 = 23.50' Base Length 1 Rows x 21.0" Wide + 9.0" Side Stone x 2 = 3.25' Base Width 4.0" Base + 21.0" Chamber Height + 4.0" Cover = 2.42' Field Height 1 Chambers x 36.0 cf +2.00' Row Adjustment x 1.80 sf x 1 Rows = 39.6 cf Chamber Storage 1 Chambers x 44.5 cf +2.00' Row Adjustment x 2.23 sf x 1 Rows = 49.0 cf Displacement 184.6 cf Field - 49.0 cf Chambers = 135.7 cf Stone x 40.0% Voids = 54.3 cf Stone Storage Chamber Storage + Stone Storage = 93.9 cf = 0.002 af Overall Storage Efficiency = 50.8% 1 Chambers 6.8 cy Field 5.0 cy Stone Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 29HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 80P: Infiltration Trench65 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.100 ac Peak Elev=334.52' Storage=36 cf 0.12 cfs 0.04 cfs0.04 cfs 0.00 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 30HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 81P: Infiltration Trench67 Inflow Area = 0.170 ac, Inflow Depth = 0.65" for WQv-1inch event Inflow = 0.21 cfs @ 11.91 hrs, Volume= 0.009 af Outflow = 0.06 cfs @ 11.74 hrs, Volume= 0.009 af, Atten= 72%, Lag= 0.0 min Discarded = 0.06 cfs @ 11.74 hrs, Volume= 0.009 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 29.21' @ 12.00 hrs Surf.Area= 103 sf Storage= 90 cf Plug-Flow detention time= 8.5 min calculated for 0.009 af (100% of inflow) Center-of-Mass det. time= 8.5 min ( 788.5 - 780.0 ) Volume Invert Avail.Storage Storage Description #1 333.27' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 27.52' 67 cf 2.83'W x 36.33'L x 2.17'H Field A 223 cf Overall - 56 cf Embedded = 167 cf x 40.0% Voids #3A 27.85' 42 cf ADS N-12 15 x 2 Inside #2 Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= -5.00' x 1.20 sf x 1 rows 139 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 333.27 20 0 0 333.77 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 27.52'25.000 in/hr Exfiltration over Surface area below 327.53' #2 Primary 329.02'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.06 cfs @ 11.74 hrs HW=27.85' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.06 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=27.52' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 31HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 81P: Infiltration Trench67 - Chamber Wizard Field A Chamber Model = ADS N-12 15 (ADS N-12® Pipe) Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= -5.00' x 1.20 sf x 1 rows 2 Chambers/Row x 20.00' Long -5.00' Row Adjustment = 35.00' Row Length +8.0" End Stone x 2 = 36.33' Base Length 1 Rows x 18.0" Wide + 8.0" Side Stone x 2 = 2.83' Base Width 4.0" Base + 18.0" Chamber Height + 4.0" Cover = 2.17' Field Height 2 Chambers x 24.0 cf -5.00' Row Adjustment x 1.20 sf x 1 Rows = 42.0 cf Chamber Storage 2 Chambers x 31.9 cf -5.00' Row Adjustment x 1.60 sf x 1 Rows = 55.9 cf Displacement 222.9 cf Field - 55.9 cf Chambers = 167.1 cf Stone x 40.0% Voids = 66.8 cf Stone Storage Chamber Storage + Stone Storage = 108.8 cf = 0.002 af Overall Storage Efficiency = 48.8% 2 Chambers 8.3 cy Field 6.2 cy Stone Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 32HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 81P: Infiltration Trench67 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.170 ac Peak Elev=29.21' Storage=90 cf 0.21 cfs 0.06 cfs0.06 cfs 0.00 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 33HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 82P: Infiltration Trench65A Inflow Area = 0.110 ac, Inflow Depth = 0.65" for WQv-1inch event Inflow = 0.14 cfs @ 11.91 hrs, Volume= 0.006 af Outflow = 0.04 cfs @ 11.70 hrs, Volume= 0.006 af, Atten= 72%, Lag= 0.0 min Discarded = 0.04 cfs @ 11.70 hrs, Volume= 0.006 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 341.54' @ 12.00 hrs Surf.Area= 66 sf Storage= 52 cf Plug-Flow detention time= 5.7 min calculated for 0.006 af (100% of inflow) Center-of-Mass det. time= 5.6 min ( 785.6 - 780.0 ) Volume Invert Avail.Storage Storage Description #1 345.68' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 340.02' 43 cf 2.83'W x 23.33'L x 2.17'H Field A 143 cf Overall - 35 cf Embedded = 108 cf x 40.0% Voids #3A 340.35' 26 cf ADS N-12 15 Inside #2 Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= +2.00' x 1.20 sf x 1 rows 100 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 345.68 20 0 0 346.18 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 340.02'25.000 in/hr Exfiltration over Surface area below 340.03' #2 Primary 341.60'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.04 cfs @ 11.70 hrs HW=340.09' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=340.02' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 34HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 82P: Infiltration Trench65A - Chamber Wizard Field A Chamber Model = ADS N-12 15 (ADS N-12® Pipe) Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= +2.00' x 1.20 sf x 1 rows 1 Chambers/Row x 20.00' Long +2.00' Row Adjustment = 22.00' Row Length +8.0" End Stone x 2 = 23.33' Base Length 1 Rows x 18.0" Wide + 8.0" Side Stone x 2 = 2.83' Base Width 4.0" Base + 18.0" Chamber Height + 4.0" Cover = 2.17' Field Height 1 Chambers x 24.0 cf +2.00' Row Adjustment x 1.20 sf x 1 Rows = 26.4 cf Chamber Storage 1 Chambers x 31.9 cf +2.00' Row Adjustment x 1.60 sf x 1 Rows = 35.1 cf Displacement 143.2 cf Field - 35.1 cf Chambers = 108.1 cf Stone x 40.0% Voids = 43.2 cf Stone Storage Chamber Storage + Stone Storage = 69.6 cf = 0.002 af Overall Storage Efficiency = 48.6% 1 Chambers 5.3 cy Field 4.0 cy Stone Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 35HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 82P: Infiltration Trench65A Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Inflow Area=0.110 ac Peak Elev=341.54' Storage=52 cf 0.14 cfs 0.04 cfs0.04 cfs 0.00 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 36HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 127P: GravelWet1 Inflow Area = 2.610 ac, Inflow Depth = 0.50" for WQv-1inch event Inflow = 2.42 cfs @ 11.95 hrs, Volume= 0.108 af Outflow = 0.06 cfs @ 14.70 hrs, Volume= 0.108 af, Atten= 98%, Lag= 165.3 min Primary = 0.06 cfs @ 14.70 hrs, Volume= 0.108 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 326.17' Surf.Area= 4,400 sf Storage= 2,125 cf Peak Elev= 327.23' @ 14.70 hrs Surf.Area= 9,090 sf Storage= 4,903 cf (2,778 cf above start) Plug-Flow detention time= 972.9 min calculated for 0.059 af (55% of inflow) Center-of-Mass det. time= 525.3 min ( 1,334.6 - 809.3 ) Volume Invert Avail.Storage Storage Description #1 323.50' 2,050 cf Custom Stage Data (Prismatic) Listed below (Recalc) 5,126 cf Overall x 40.0% Voids #2 325.83' 147 cf Custom Stage Data (Prismatic) Listed below (Recalc) 1,474 cf Overall x 10.0% Voids #3 326.50' 20,418 cf Custom Stage Data (Prismatic) Listed below (Recalc) 22,616 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 323.50 2,200 0 0 325.83 2,200 5,126 5,126 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 325.83 2,200 0 0 326.50 2,200 1,474 1,474 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 326.50 2,200 0 0 327.00 4,413 1,653 1,653 328.00 5,610 5,012 6,665 329.00 6,862 6,236 12,901 330.00 8,172 7,517 20,418 Device Routing Invert Outlet Devices #1 Primary 326.17'18.0" Round Culvert L= 75.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 326.17' / 325.80' S= 0.0049 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Device 1 326.17'1.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 327.30'1.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 328.50'48.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 37HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Primary OutFlow Max=0.06 cfs @ 14.70 hrs HW=327.23' (Free Discharge) 1=Culvert (Passes 0.06 cfs of 3.40 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.06 cfs @ 4.81 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) Pond 127P: GravelWet1 Inflow Primary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)2 1 0 Inflow Area=2.610 ac Peak Elev=327.23' Storage=4,903 cf 2.42 cfs 0.06 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 38HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 129P: GravelWet2 Inflow Area = 7.060 ac, Inflow Depth = 0.63" for WQv-1inch event Inflow = 8.25 cfs @ 11.95 hrs, Volume= 0.371 af Outflow = 0.18 cfs @ 15.18 hrs, Volume= 0.371 af, Atten= 98%, Lag= 194.0 min Primary = 0.18 cfs @ 15.18 hrs, Volume= 0.371 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 330.67' Surf.Area= 15,488 sf Storage= 7,481 cf Peak Elev= 332.00' @ 15.18 hrs Surf.Area= 27,034 sf Storage= 17,429 cf (9,948 cf above start) Plug-Flow detention time= 1,140.0 min calculated for 0.199 af (54% of inflow) Center-of-Mass det. time= 630.3 min ( 1,439.8 - 809.5 ) Volume Invert Avail.Storage Storage Description #1 328.00' 7,217 cf Custom Stage Data (Prismatic) Listed below (Recalc) 18,044 cf Overall x 40.0% Voids #2 330.33' 519 cf Custom Stage Data (Prismatic) Listed below (Recalc) 5,188 cf Overall x 10.0% Voids #3 331.00' 44,909 cf Custom Stage Data (Prismatic) Listed below (Recalc) 52,645 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 328.00 7,744 0 0 330.33 7,744 18,044 18,044 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 330.33 7,744 0 0 331.00 7,744 5,188 5,188 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 331.00 7,744 0 0 332.00 11,537 9,641 9,641 333.00 13,558 12,548 22,188 334.00 15,674 14,616 36,804 334.50 16,744 8,105 44,909 Device Routing Invert Outlet Devices #1 Primary 330.67'18.0" Round Culvert L= 15.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 330.67' / 329.00' S= 0.1113 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Device 1 330.67'2.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 332.00'1.0" Vert. Orifice/Grate C= 0.600 #4 Primary 333.00'6.0" Vert. Orifice/Grate C= 0.600 #5 Device 1 333.50'48.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 #6 Primary 333.75'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 39HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Primary OutFlow Max=0.18 cfs @ 15.18 hrs HW=332.00' (Free Discharge) 1=Culvert (Passes 0.18 cfs of 5.16 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.18 cfs @ 5.34 fps) 3=Orifice/Grate (Orifice Controls 0.00 cfs @ 0.23 fps) 5=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 6=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Pond 129P: GravelWet2 InflowPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)9 8 7 6 5 4 3 2 1 0 Inflow Area=7.060 ac Peak Elev=332.00' Storage=17,429 cf 8.25 cfs 0.18 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 40HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 49L: Study2 Inflow Area = 33.820 ac, Inflow Depth = 0.17" for WQv-1inch event Inflow = 0.24 cfs @ 15.11 hrs, Volume= 0.479 af Primary = 0.24 cfs @ 15.11 hrs, Volume= 0.479 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 49L: Study2 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=33.820 ac 0.24 cfs0.24 cfs Type II 24-hr WQv-1inch Rainfall=1.00"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 41HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 67L: SN4 Inflow Area = 33.820 ac, Inflow Depth = 0.17" for WQv-1inch event Inflow = 0.24 cfs @ 15.11 hrs, Volume= 0.479 af Primary = 0.24 cfs @ 15.11 hrs, Volume= 0.479 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 67L: SN4 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=33.820 ac 0.24 cfs0.24 cfs CPv Grass Channels, Pond A, Infiltration A Unchanged Infiltration Trenches Unchanged 130S SWMA131S GCA1 132S GCA2 133S GCA3 134S CB63/64 135S CB65/66 136S CB66/67 137S CB65A/66A 153S SWMB 154S SWMC 140R GC-A1 141R GC-A2 142R GC-A3 143P Pond A 144P Infiltration A 145P Infiltration Trench63 146P Infiltration Trench65 147P Infiltration Trench67 148P Infiltration Trench65A149P GravelWet1 150P GravelWet2 151L Study2 152L SN4 Routing Diagram for Hillside2020-postPrepared by Krebs & Lansing Consulting Engineers, Inc., Printed 9/15/2021 HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 2HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Project Notes Hillside @ O'Brien Farm Eldredge Street, Kennedy Drive, Old Farm Road South Burlington, Vermont Post Development Stormwater Model Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 3HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 6.330 39 >75% Grass cover, Good, HSG A (130S, 131S, 132S, 133S, 134S, 135S, 136S, 137S) 0.370 61 >75% Grass cover, Good, HSG B (130S) 3.520 74 >75% Grass cover, Good, HSG C (130S) 4.160 80 >75% Grass cover, Good, HSG D (130S, 131S, 132S) 4.670 98 Paved parking, HSG A (130S, 134S, 135S, 136S, 137S) 3.810 98 Roofs, HSG A (130S, 131S, 132S, 133S) 0.200 98 Water Surface, 0% imp, HSG A (130S) 0.730 30 Woods, Good, HSG A (130S, 131S, 132S) 0.910 77 Woods, Good, HSG D (130S, 131S, 132S) 2.060 91 Workbook (153S) 7.060 90 Workbook (154S) 33.820 78 TOTAL AREA Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 4HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Time span=0.00-128.00 hrs, dt=0.01 hrs, 12801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=20.360 ac Runoff Depth=0.75"Subcatchment 130S: SWMA Flow Length=1,465' Tc=6.8 min CN=74 Runoff=23.42 cfs 1.272 af Runoff Area=1.940 ac Runoff Depth=0.47"Subcatchment 131S: GCA1 Flow Length=168' Tc=4.5 min CN=67 Runoff=1.57 cfs 0.077 af Runoff Area=1.200 ac Runoff Depth=0.34"Subcatchment 132S: GCA2 Flow Length=138' Tc=4.5 min CN=51 Runoff=0.68 cfs 0.034 af Runoff Area=0.650 ac Runoff Depth=1.13"Subcatchment 133S: GCA3 Tc=1.0 min CN=79 Runoff=1.35 cfs 0.061 af Runoff Area=0.170 ac Runoff Depth=1.38"Subcatchment 134S: CB63/64 Tc=1.0 min CN=88 Runoff=0.43 cfs 0.020 af Runoff Area=0.100 ac Runoff Depth=1.34"Subcatchment 135S: CB65/66 Tc=1.0 min CN=86 Runoff=0.25 cfs 0.011 af Runoff Area=0.170 ac Runoff Depth=1.38"Subcatchment 136S: CB66/67 Tc=1.0 min CN=88 Runoff=0.43 cfs 0.020 af Runoff Area=0.110 ac Runoff Depth=1.37"Subcatchment 137S: CB65A/66A Tc=1.0 min CN=87 Runoff=0.28 cfs 0.013 af Runoff Area=2.060 ac Runoff Depth=1.08"Subcatchment 153S: SWMB Tc=4.1 min CN=91 Runoff=4.20 cfs 0.185 af Runoff Area=7.060 ac Runoff Depth=1.01"Subcatchment 154S: SWMC Tc=4.3 min CN=90 Runoff=13.49 cfs 0.594 af Avg. Flow Depth=0.29' Max Vel=0.51 fps Inflow=1.57 cfs 0.077 afReach 140R: GC-A1 n=0.120 L=440.0' S=0.0107 '/' Capacity=9.42 cfs Outflow=0.88 cfs 0.077 af Avg. Flow Depth=0.20' Max Vel=0.56 fps Inflow=0.68 cfs 0.034 afReach 141R: GC-A2 n=0.150 L=252.0' S=0.0321 '/' Capacity=9.60 cfs Outflow=0.52 cfs 0.034 af Avg. Flow Depth=0.34' Max Vel=0.54 fps Inflow=1.35 cfs 0.061 afReach 142R: GC-A3 n=0.125 L=520.0' S=0.0121 '/' Capacity=5.84 cfs Outflow=0.73 cfs 0.061 af Peak Elev=332.92' Storage=48,172 cf Inflow=23.91 cfs 1.444 afPond 143P: Pond A Outflow=4.83 cfs 1.444 af Peak Elev=331.02' Storage=157 cf Inflow=4.83 cfs 1.444 afPond 144P: Infiltration A Discarded=4.83 cfs 1.444 af Primary=0.00 cfs 0.000 af Outflow=4.83 cfs 1.444 af Peak Elev=348.37' Storage=117 cf Inflow=0.43 cfs 0.020 afPond 145P: Infiltration Trench63 Discarded=0.06 cfs 0.016 af Primary=0.37 cfs 0.003 af Outflow=0.43 cfs 0.020 af Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 5HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Peak Elev=335.55' Storage=82 cf Inflow=0.25 cfs 0.011 afPond 146P: Infiltration Trench65 Discarded=0.04 cfs 0.010 af Primary=0.22 cfs 0.001 af Outflow=0.26 cfs 0.011 af Peak Elev=329.14' Storage=109 cf Inflow=0.43 cfs 0.020 afPond 147P: Infiltration Trench67 Discarded=0.06 cfs 0.016 af Primary=0.44 cfs 0.003 af Outflow=0.50 cfs 0.020 af Peak Elev=341.82' Storage=60 cf Inflow=0.28 cfs 0.013 afPond 148P: Infiltration Trench65A Discarded=0.04 cfs 0.010 af Primary=0.24 cfs 0.002 af Outflow=0.27 cfs 0.013 af Peak Elev=327.76' Storage=7,563 cf Inflow=5.14 cfs 0.195 afPond 149P: GravelWet1 Outflow=0.09 cfs 0.195 af Peak Elev=332.58' Storage=24,367 cf Inflow=13.49 cfs 0.594 afPond 150P: GravelWet2 Outflow=0.24 cfs 0.594 af Inflow=0.33 cfs 0.789 afLink 151L: Study2 Primary=0.33 cfs 0.789 af Inflow=0.33 cfs 0.789 afLink 152L: SN4 Primary=0.33 cfs 0.789 af Total Runoff Area = 33.820 ac Runoff Volume = 2.286 af Average Runoff Depth = 0.81" Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 6HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 130S: SWMA Runoff = 23.42 cfs @ 11.98 hrs, Volume= 1.272 af, Depth= 0.75" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 1 Year Rainfall=1.90" Area (ac) CN Description 2.880 98 Roofs, HSG A 4.220 98 Paved parking, HSG A 0.200 98 Water Surface, 0% imp, HSG A 5.250 39 >75% Grass cover, Good, HSG A 0.370 61 >75% Grass cover, Good, HSG B 3.520 74 >75% Grass cover, Good, HSG C 3.770 80 >75% Grass cover, Good, HSG D 0.020 30 Woods, Good, HSG A 0.130 77 Woods, Good, HSG D 20.360 74 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.2 20 0.0500 0.10 Sheet Flow, yard Grass: Dense n= 0.240 P2= 2.30" 1.8 220 0.0160 2.04 Shallow Concentrated Flow, swale Unpaved Kv= 16.1 fps 1.8 1,225 0.0450 11.17 13.70 Pipe Channel, Piped 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 6.8 1,465 Total Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 7HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcatchment 130S: SWMA Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 1 Year Rainfall=1.90" Runoff Area=20.360 ac Runoff Volume=1.272 af Runoff Depth=0.75" Flow Length=1,465' Tc=6.8 min CN=74 23.42 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 8HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 131S: GCA1 Runoff = 1.57 cfs @ 11.96 hrs, Volume= 0.077 af, Depth= 0.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 1 Year Rainfall=1.90" Area (ac) CN Description 0.290 98 Roofs, HSG A 0.320 30 Woods, Good, HSG A 0.680 77 Woods, Good, HSG D 0.320 39 >75% Grass cover, Good, HSG A 0.330 80 >75% Grass cover, Good, HSG D 1.940 67 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 140 0.2000 7.20 Shallow Concentrated Flow, shallow Unpaved Kv= 16.1 fps 4.5 168 Total Subcatchment 131S: GCA1 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Type II 24-hr 1 Year Rainfall=1.90" Runoff Area=1.940 ac Runoff Volume=0.077 af Runoff Depth=0.47" Flow Length=168' Tc=4.5 min CN=67 1.57 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 9HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 132S: GCA2 Runoff = 0.68 cfs @ 11.95 hrs, Volume= 0.034 af, Depth= 0.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 1 Year Rainfall=1.90" Area (ac) CN Description 0.200 98 Roofs, HSG A 0.390 30 Woods, Good, HSG A 0.100 77 Woods, Good, HSG D 0.450 39 >75% Grass cover, Good, HSG A 0.060 80 >75% Grass cover, Good, HSG D 1.200 51 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 110 0.1090 5.32 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.5 138 Total Subcatchment 132S: GCA2 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 1 Year Rainfall=1.90" Runoff Area=1.200 ac Runoff Volume=0.034 af Runoff Depth=0.34" Flow Length=138' Tc=4.5 min CN=51 0.68 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 10HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 133S: GCA3 Runoff = 1.35 cfs @ 11.91 hrs, Volume= 0.061 af, Depth= 1.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 1 Year Rainfall=1.90" Area (ac) CN Description 0.440 98 Roofs, HSG A 0.210 39 >75% Grass cover, Good, HSG A 0.650 79 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 133S: GCA3 Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Type II 24-hr 1 Year Rainfall=1.90" Runoff Area=0.650 ac Runoff Volume=0.061 af Runoff Depth=1.13" Tc=1.0 min CN=79 1.35 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 11HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 134S: CB63/64 Undeveloped area draining to Pond 2 Runoff = 0.43 cfs @ 11.91 hrs, Volume= 0.020 af, Depth= 1.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 1 Year Rainfall=1.90" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 134S: CB63/64 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 1 Year Rainfall=1.90" Runoff Area=0.170 ac Runoff Volume=0.020 af Runoff Depth=1.38" Tc=1.0 min CN=88 0.43 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 12HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 135S: CB65/66 Undeveloped area draining to Pond 2 Runoff = 0.25 cfs @ 11.91 hrs, Volume= 0.011 af, Depth= 1.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 1 Year Rainfall=1.90" Area (ac) CN Description 0.080 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.100 86 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 135S: CB65/66 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 1 Year Rainfall=1.90" Runoff Area=0.100 ac Runoff Volume=0.011 af Runoff Depth=1.34" Tc=1.0 min CN=86 0.25 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 13HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 136S: CB66/67 Undeveloped area draining to Pond 2 Runoff = 0.43 cfs @ 11.91 hrs, Volume= 0.020 af, Depth= 1.38" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 1 Year Rainfall=1.90" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 136S: CB66/67 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.48 0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 1 Year Rainfall=1.90" Runoff Area=0.170 ac Runoff Volume=0.020 af Runoff Depth=1.38" Tc=1.0 min CN=88 0.43 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 14HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 137S: CB65A/66A Undeveloped area draining to Pond 2 Runoff = 0.28 cfs @ 11.91 hrs, Volume= 0.013 af, Depth= 1.37" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 1 Year Rainfall=1.90" Area (ac) CN Description 0.090 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.110 87 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 137S: CB65A/66A Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 1 Year Rainfall=1.90" Runoff Area=0.110 ac Runoff Volume=0.013 af Runoff Depth=1.37" Tc=1.0 min CN=87 0.28 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 15HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 153S: SWMB Runoff = 4.20 cfs @ 11.95 hrs, Volume= 0.185 af, Depth= 1.08" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 1 Year Rainfall=1.90" Area (ac) CN Description * 2.060 91 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.1 Direct Entry, Workbook- Lag Subcatchment 153S: SWMB Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)4 3 2 1 0 Type II 24-hr 1 Year Rainfall=1.90" Runoff Area=2.060 ac Runoff Volume=0.185 af Runoff Depth=1.08" Tc=4.1 min CN=91 4.20 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 16HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 154S: SWMC Runoff = 13.49 cfs @ 11.95 hrs, Volume= 0.594 af, Depth= 1.01" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 1 Year Rainfall=1.90" Area (ac) CN Description * 7.060 90 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.3 Direct Entry, Workbook-Lag Subcatchment 154S: SWMC Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 1 Year Rainfall=1.90" Runoff Area=7.060 ac Runoff Volume=0.594 af Runoff Depth=1.01" Tc=4.3 min CN=90 13.49 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 17HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 140R: GC-A1 Inflow Area = 1.940 ac, Inflow Depth = 0.47" for 1 Year event Inflow = 1.57 cfs @ 11.96 hrs, Volume= 0.077 af Outflow = 0.88 cfs @ 12.27 hrs, Volume= 0.077 af, Atten= 44%, Lag= 18.7 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.51 fps, Min. Travel Time= 14.4 min Avg. Velocity = 0.11 fps, Avg. Travel Time= 68.1 min Peak Storage= 761 cf @ 12.03 hrs Average Depth at Peak Storage= 0.29' Bank-Full Depth= 1.08' Flow Area= 8.9 sf, Capacity= 9.42 cfs 5.00' x 1.08' deep channel, n= 0.120 Side Slope Z-value= 3.0 '/' Top Width= 11.48' Length= 440.0' Slope= 0.0107 '/' Inlet Invert= 361.70', Outlet Invert= 357.00' ‡ Reach 140R: GC-A1 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Inflow Area=1.940 ac Avg. Flow Depth=0.29' Max Vel=0.51 fps n=0.120 L=440.0' S=0.0107 '/' Capacity=9.42 cfs 1.57 cfs 0.88 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 18HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 141R: GC-A2 Inflow Area = 1.200 ac, Inflow Depth = 0.34" for 1 Year event Inflow = 0.68 cfs @ 11.95 hrs, Volume= 0.034 af Outflow = 0.52 cfs @ 12.13 hrs, Volume= 0.034 af, Atten= 23%, Lag= 10.4 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.56 fps, Min. Travel Time= 7.5 min Avg. Velocity = 0.12 fps, Avg. Travel Time= 33.8 min Peak Storage= 236 cf @ 12.00 hrs Average Depth at Peak Storage= 0.20' Bank-Full Depth= 1.00' Flow Area= 7.0 sf, Capacity= 9.60 cfs 4.00' x 1.00' deep channel, n= 0.150 Side Slope Z-value= 3.0 '/' Top Width= 10.00' Length= 252.0' Slope= 0.0321 '/' Inlet Invert= 365.10', Outlet Invert= 357.00' ‡ Reach 141R: GC-A2 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=1.200 ac Avg. Flow Depth=0.20' Max Vel=0.56 fps n=0.150 L=252.0' S=0.0321 '/' Capacity=9.60 cfs 0.68 cfs 0.52 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 19HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 142R: GC-A3 Inflow Area = 0.650 ac, Inflow Depth = 1.13" for 1 Year event Inflow = 1.35 cfs @ 11.91 hrs, Volume= 0.061 af Outflow = 0.73 cfs @ 12.24 hrs, Volume= 0.061 af, Atten= 46%, Lag= 19.6 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.54 fps, Min. Travel Time= 16.1 min Avg. Velocity = 0.11 fps, Avg. Travel Time= 76.7 min Peak Storage= 709 cf @ 11.97 hrs Average Depth at Peak Storage= 0.34' Bank-Full Depth= 1.00' Flow Area= 6.0 sf, Capacity= 5.84 cfs 3.00' x 1.00' deep channel, n= 0.125 Side Slope Z-value= 3.0 '/' Top Width= 9.00' Length= 520.0' Slope= 0.0121 '/' Inlet Invert= 342.67', Outlet Invert= 336.40' ‡ Reach 142R: GC-A3 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Inflow Area=0.650 ac Avg. Flow Depth=0.34' Max Vel=0.54 fps n=0.125 L=520.0' S=0.0121 '/' Capacity=5.84 cfs 1.35 cfs 0.73 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 20HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 143P: Pond A Inflow Area = 24.150 ac, Inflow Depth = 0.72" for 1 Year event Inflow = 23.91 cfs @ 11.98 hrs, Volume= 1.444 af Outflow = 4.83 cfs @ 12.29 hrs, Volume= 1.444 af, Atten= 80%, Lag= 18.2 min Primary = 4.83 cfs @ 12.29 hrs, Volume= 1.444 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 331.25' Surf.Area= 13,348 sf Storage= 23,564 cf Peak Elev= 332.92' @ 12.29 hrs Surf.Area= 16,307 sf Storage= 48,172 cf (24,609 cf above start) Plug-Flow detention time= 380.0 min calculated for 0.903 af (63% of inflow) Center-of-Mass det. time= 136.9 min ( 932.3 - 795.3 ) Volume Invert Avail.Storage Storage Description #1 327.25' 120,624 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 327.25 37 0 0 327.75 2,014 513 513 328.00 2,516 566 1,079 329.00 4,793 3,655 4,734 330.00 6,677 5,735 10,469 331.00 12,941 9,809 20,278 332.00 14,567 13,754 34,032 333.00 16,466 15,517 49,548 334.00 18,587 17,527 67,075 335.00 20,824 19,706 86,780 336.00 23,135 21,980 108,760 336.50 24,321 11,864 120,624 Device Routing Invert Outlet Devices #1 Primary 331.15'15.0" Round Culvert L= 20.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 331.15' / 331.00' S= 0.0075 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 331.25'12.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 332.75'48.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 #4 Primary 335.75'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Primary OutFlow Max=4.95 cfs @ 12.29 hrs HW=332.92' (Free Discharge) 1=Culvert (Passes 4.95 cfs of 4.98 cfs potential flow) 2=Orifice/Grate (Orifice Controls 4.08 cfs @ 5.20 fps) 3=Orifice/Grate (Orifice Controls 0.87 cfs @ 1.31 fps) 4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 21HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 143P: Pond A Inflow Primary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=24.150 ac Peak Elev=332.92' Storage=48,172 cf 23.91 cfs 4.83 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 22HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 144P: Infiltration A Inflow Area = 24.150 ac, Inflow Depth = 0.72" for 1 Year event Inflow = 4.83 cfs @ 12.29 hrs, Volume= 1.444 af Outflow = 4.83 cfs @ 12.29 hrs, Volume= 1.444 af, Atten= 0%, Lag= 0.5 min Discarded = 4.83 cfs @ 12.29 hrs, Volume= 1.444 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 331.02' @ 12.29 hrs Surf.Area= 7,043 sf Storage= 157 cf Plug-Flow detention time= 0.5 min calculated for 1.444 af (100% of inflow) Center-of-Mass det. time= 0.5 min ( 932.8 - 932.3 ) Volume Invert Avail.Storage Storage Description #1 331.00' 27,230 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 331.00 7,013 0 0 332.00 8,357 7,685 7,685 333.00 9,758 9,058 16,743 334.00 11,216 10,487 27,230 Device Routing Invert Outlet Devices #1 Discarded 331.00'40.000 in/hr Exfiltration over Surface area below 331.01' #2 Primary 331.75'6.0" Vert. Orifice/Grate C= 0.600 #3 Primary 333.25'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Discarded OutFlow Max=6.51 cfs @ 12.29 hrs HW=331.02' (Free Discharge) 1=Exfiltration (Exfiltration Controls 6.51 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=331.00' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 23HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 144P: Infiltration A Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)5 4 3 2 1 0 Inflow Area=24.150 ac Peak Elev=331.02' Storage=157 cf 4.83 cfs4.83 cfs4.83 cfs 0.00 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 24HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 145P: Infiltration Trench63 Inflow Area = 0.170 ac, Inflow Depth = 1.38" for 1 Year event Inflow = 0.43 cfs @ 11.91 hrs, Volume= 0.020 af Outflow = 0.43 cfs @ 11.91 hrs, Volume= 0.020 af, Atten= 1%, Lag= 0.3 min Discarded = 0.06 cfs @ 11.58 hrs, Volume= 0.016 af Primary = 0.37 cfs @ 11.91 hrs, Volume= 0.003 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 348.37' @ 11.91 hrs Surf.Area= 102 sf Storage= 117 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 6.9 min ( 767.4 - 760.5 ) Volume Invert Avail.Storage Storage Description #1 352.80' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 346.18' 72 cf 3.25'W x 31.50'L x 2.42'H Field A 248 cf Overall - 67 cf Embedded = 181 cf x 40.0% Voids #3A 346.51' 54 cf ADS N-12 18 x 2 Inside #2 Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= -10.00' x 1.80 sf x 1 rows 156 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 352.80 20 0 0 353.30 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 346.18'25.000 in/hr Exfiltration over Surface area below 346.19' #2 Primary 348.09'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.06 cfs @ 11.58 hrs HW=346.25' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.06 cfs) Primary OutFlow Max=0.36 cfs @ 11.91 hrs HW=348.37' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.36 cfs @ 1.79 fps) Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 25HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 145P: Infiltration Trench63 - Chamber Wizard Field A Chamber Model = ADS N-12 18 (ADS N-12® Pipe) Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= -10.00' x 1.80 sf x 1 rows 2 Chambers/Row x 20.00' Long -10.00' Row Adjustment = 30.00' Row Length +9.0" End Stone x 2 = 31.50' Base Length 1 Rows x 21.0" Wide + 9.0" Side Stone x 2 = 3.25' Base Width 4.0" Base + 21.0" Chamber Height + 4.0" Cover = 2.42' Field Height 2 Chambers x 36.0 cf -10.00' Row Adjustment x 1.80 sf x 1 Rows = 54.0 cf Chamber Storage 2 Chambers x 44.5 cf -10.00' Row Adjustment x 2.23 sf x 1 Rows = 66.8 cf Displacement 247.5 cf Field - 66.8 cf Chambers = 180.7 cf Stone x 40.0% Voids = 72.3 cf Stone Storage Chamber Storage + Stone Storage = 126.3 cf = 0.003 af Overall Storage Efficiency = 51.0% 2 Chambers 9.2 cy Field 6.7 cy Stone Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 26HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 145P: Infiltration Trench63 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.170 ac Peak Elev=348.37' Storage=117 cf 0.43 cfs0.43 cfs 0.06 cfs 0.37 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 27HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 146P: Infiltration Trench65 Inflow Area = 0.100 ac, Inflow Depth = 1.34" for 1 Year event Inflow = 0.25 cfs @ 11.91 hrs, Volume= 0.011 af Outflow = 0.26 cfs @ 11.91 hrs, Volume= 0.011 af, Atten= 0%, Lag= 0.3 min Discarded = 0.04 cfs @ 11.61 hrs, Volume= 0.010 af Primary = 0.22 cfs @ 11.91 hrs, Volume= 0.001 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Peak Elev= 335.55' @ 11.91 hrs Surf.Area= 76 sf Storage= 82 cf Plug-Flow detention time= 6.9 min calculated for 0.011 af (100% of inflow) Center-of-Mass det. time= 6.9 min ( 767.4 - 760.5 ) Volume Invert Avail.Storage Storage Description #1 339.60' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 333.52' 54 cf 3.25'W x 23.50'L x 2.42'H Field A 185 cf Overall - 49 cf Embedded = 136 cf x 40.0% Voids #3A 333.85' 40 cf ADS N-12 18 Inside #2 Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= +2.00' x 1.80 sf x 1 rows 124 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 339.60 20 0 0 340.10 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 333.52'25.000 in/hr Exfiltration over Surface area below 333.53' #2 Primary 335.35'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.04 cfs @ 11.61 hrs HW=333.59' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.20 cfs @ 11.91 hrs HW=335.55' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.20 cfs @ 1.53 fps) Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 28HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 146P: Infiltration Trench65 - Chamber Wizard Field A Chamber Model = ADS N-12 18 (ADS N-12® Pipe) Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= +2.00' x 1.80 sf x 1 rows 1 Chambers/Row x 20.00' Long +2.00' Row Adjustment = 22.00' Row Length +9.0" End Stone x 2 = 23.50' Base Length 1 Rows x 21.0" Wide + 9.0" Side Stone x 2 = 3.25' Base Width 4.0" Base + 21.0" Chamber Height + 4.0" Cover = 2.42' Field Height 1 Chambers x 36.0 cf +2.00' Row Adjustment x 1.80 sf x 1 Rows = 39.6 cf Chamber Storage 1 Chambers x 44.5 cf +2.00' Row Adjustment x 2.23 sf x 1 Rows = 49.0 cf Displacement 184.6 cf Field - 49.0 cf Chambers = 135.7 cf Stone x 40.0% Voids = 54.3 cf Stone Storage Chamber Storage + Stone Storage = 93.9 cf = 0.002 af Overall Storage Efficiency = 50.8% 1 Chambers 6.8 cy Field 5.0 cy Stone Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 29HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 146P: Infiltration Trench65 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.100 ac Peak Elev=335.55' Storage=82 cf 0.25 cfs0.26 cfs 0.04 cfs 0.22 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 30HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 147P: Infiltration Trench67 Inflow Area = 0.170 ac, Inflow Depth = 1.38" for 1 Year event Inflow = 0.43 cfs @ 11.91 hrs, Volume= 0.020 af Outflow = 0.50 cfs @ 11.91 hrs, Volume= 0.020 af, Atten= 0%, Lag= 0.0 min Discarded = 0.06 cfs @ 11.62 hrs, Volume= 0.016 af Primary = 0.44 cfs @ 11.91 hrs, Volume= 0.003 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 329.14' @ 11.91 hrs Surf.Area= 103 sf Storage= 109 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 8.4 min ( 768.9 - 760.5 ) Volume Invert Avail.Storage Storage Description #1 333.27' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 27.52' 67 cf 2.83'W x 36.33'L x 2.17'H Field A 223 cf Overall - 56 cf Embedded = 167 cf x 40.0% Voids #3A 27.85' 42 cf ADS N-12 15 x 2 Inside #2 Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= -5.00' x 1.20 sf x 1 rows 139 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 333.27 20 0 0 333.77 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 27.52'25.000 in/hr Exfiltration over Surface area below 327.53' #2 Primary 329.02'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.06 cfs @ 11.62 hrs HW=27.86' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.06 cfs) Primary OutFlow Max=0.07 cfs @ 11.91 hrs HW=329.14' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.07 cfs @ 1.19 fps) Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 31HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 147P: Infiltration Trench67 - Chamber Wizard Field A Chamber Model = ADS N-12 15 (ADS N-12® Pipe) Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= -5.00' x 1.20 sf x 1 rows 2 Chambers/Row x 20.00' Long -5.00' Row Adjustment = 35.00' Row Length +8.0" End Stone x 2 = 36.33' Base Length 1 Rows x 18.0" Wide + 8.0" Side Stone x 2 = 2.83' Base Width 4.0" Base + 18.0" Chamber Height + 4.0" Cover = 2.17' Field Height 2 Chambers x 24.0 cf -5.00' Row Adjustment x 1.20 sf x 1 Rows = 42.0 cf Chamber Storage 2 Chambers x 31.9 cf -5.00' Row Adjustment x 1.60 sf x 1 Rows = 55.9 cf Displacement 222.9 cf Field - 55.9 cf Chambers = 167.1 cf Stone x 40.0% Voids = 66.8 cf Stone Storage Chamber Storage + Stone Storage = 108.8 cf = 0.002 af Overall Storage Efficiency = 48.8% 2 Chambers 8.3 cy Field 6.2 cy Stone Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 32HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 147P: Infiltration Trench67 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.170 ac Peak Elev=329.14' Storage=109 cf 0.43 cfs 0.50 cfs 0.06 cfs 0.44 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 33HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 148P: Infiltration Trench65A Inflow Area = 0.110 ac, Inflow Depth = 1.37" for 1 Year event Inflow = 0.28 cfs @ 11.91 hrs, Volume= 0.013 af Outflow = 0.27 cfs @ 11.91 hrs, Volume= 0.013 af, Atten= 1%, Lag= 0.2 min Discarded = 0.04 cfs @ 11.58 hrs, Volume= 0.010 af Primary = 0.24 cfs @ 11.91 hrs, Volume= 0.002 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 341.82' @ 11.91 hrs Surf.Area= 66 sf Storage= 60 cf Plug-Flow detention time= 5.1 min calculated for 0.013 af (100% of inflow) Center-of-Mass det. time= 5.2 min ( 765.7 - 760.5 ) Volume Invert Avail.Storage Storage Description #1 345.68' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 340.02' 43 cf 2.83'W x 23.33'L x 2.17'H Field A 143 cf Overall - 35 cf Embedded = 108 cf x 40.0% Voids #3A 340.35' 26 cf ADS N-12 15 Inside #2 Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= +2.00' x 1.20 sf x 1 rows 100 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 345.68 20 0 0 346.18 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 340.02'25.000 in/hr Exfiltration over Surface area below 340.03' #2 Primary 341.60'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.04 cfs @ 11.58 hrs HW=340.08' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.23 cfs @ 11.91 hrs HW=341.82' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.23 cfs @ 1.60 fps) Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 34HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 148P: Infiltration Trench65A - Chamber Wizard Field A Chamber Model = ADS N-12 15 (ADS N-12® Pipe) Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= +2.00' x 1.20 sf x 1 rows 1 Chambers/Row x 20.00' Long +2.00' Row Adjustment = 22.00' Row Length +8.0" End Stone x 2 = 23.33' Base Length 1 Rows x 18.0" Wide + 8.0" Side Stone x 2 = 2.83' Base Width 4.0" Base + 18.0" Chamber Height + 4.0" Cover = 2.17' Field Height 1 Chambers x 24.0 cf +2.00' Row Adjustment x 1.20 sf x 1 Rows = 26.4 cf Chamber Storage 1 Chambers x 31.9 cf +2.00' Row Adjustment x 1.60 sf x 1 Rows = 35.1 cf Displacement 143.2 cf Field - 35.1 cf Chambers = 108.1 cf Stone x 40.0% Voids = 43.2 cf Stone Storage Chamber Storage + Stone Storage = 69.6 cf = 0.002 af Overall Storage Efficiency = 48.6% 1 Chambers 5.3 cy Field 4.0 cy Stone Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 35HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 148P: Infiltration Trench65A Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=0.110 ac Peak Elev=341.82' Storage=60 cf 0.28 cfs0.27 cfs 0.04 cfs 0.24 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 36HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 149P: GravelWet1 Inflow Area = 2.610 ac, Inflow Depth = 0.90" for 1 Year event Inflow = 5.14 cfs @ 11.93 hrs, Volume= 0.195 af Outflow = 0.09 cfs @ 15.44 hrs, Volume= 0.195 af, Atten= 98%, Lag= 210.6 min Primary = 0.09 cfs @ 15.44 hrs, Volume= 0.195 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 326.17' Surf.Area= 4,400 sf Storage= 2,125 cf Peak Elev= 327.76' @ 15.44 hrs Surf.Area= 9,726 sf Storage= 7,563 cf (5,438 cf above start) Plug-Flow detention time= 1,076.1 min calculated for 0.146 af (75% of inflow) Center-of-Mass det. time= 747.9 min ( 1,561.2 - 813.2 ) Volume Invert Avail.Storage Storage Description #1 323.50' 2,050 cf Custom Stage Data (Prismatic) Listed below (Recalc) 5,126 cf Overall x 40.0% Voids #2 325.83' 147 cf Custom Stage Data (Prismatic) Listed below (Recalc) 1,474 cf Overall x 10.0% Voids #3 326.50' 20,418 cf Custom Stage Data (Prismatic) Listed below (Recalc) 22,616 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 323.50 2,200 0 0 325.83 2,200 5,126 5,126 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 325.83 2,200 0 0 326.50 2,200 1,474 1,474 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 326.50 2,200 0 0 327.00 4,413 1,653 1,653 328.00 5,610 5,012 6,665 329.00 6,862 6,236 12,901 330.00 8,172 7,517 20,418 Device Routing Invert Outlet Devices #1 Primary 326.17'18.0" Round Culvert L= 75.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 326.17' / 325.80' S= 0.0049 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Device 1 326.17'1.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 327.30'1.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 328.50'48.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 37HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Primary OutFlow Max=0.09 cfs @ 15.44 hrs HW=327.76' (Free Discharge) 1=Culvert (Passes 0.09 cfs of 6.17 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.07 cfs @ 5.96 fps) 3=Orifice/Grate (Orifice Controls 0.02 cfs @ 3.12 fps) 4=Orifice/Grate ( Controls 0.00 cfs) Pond 149P: GravelWet1 Inflow Primary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)5 4 3 2 1 0 Inflow Area=2.610 ac Peak Elev=327.76' Storage=7,563 cf 5.14 cfs 0.09 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 38HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 150P: GravelWet2 Inflow Area = 7.060 ac, Inflow Depth = 1.01" for 1 Year event Inflow = 13.49 cfs @ 11.95 hrs, Volume= 0.594 af Outflow = 0.24 cfs @ 16.57 hrs, Volume= 0.594 af, Atten= 98%, Lag= 277.1 min Primary = 0.24 cfs @ 16.57 hrs, Volume= 0.594 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 330.67' Surf.Area= 15,488 sf Storage= 7,481 cf Peak Elev= 332.58' @ 16.57 hrs Surf.Area= 28,191 sf Storage= 24,367 cf (16,886 cf above start) Plug-Flow detention time= 1,265.1 min calculated for 0.422 af (71% of inflow) Center-of-Mass det. time= 857.3 min ( 1,681.3 - 824.0 ) Volume Invert Avail.Storage Storage Description #1 328.00' 7,217 cf Custom Stage Data (Prismatic) Listed below (Recalc) 18,044 cf Overall x 40.0% Voids #2 330.33' 519 cf Custom Stage Data (Prismatic) Listed below (Recalc) 5,188 cf Overall x 10.0% Voids #3 331.00' 44,909 cf Custom Stage Data (Prismatic) Listed below (Recalc) 52,645 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 328.00 7,744 0 0 330.33 7,744 18,044 18,044 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 330.33 7,744 0 0 331.00 7,744 5,188 5,188 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 331.00 7,744 0 0 332.00 11,537 9,641 9,641 333.00 13,558 12,548 22,188 334.00 15,674 14,616 36,804 334.50 16,744 8,105 44,909 Device Routing Invert Outlet Devices #1 Primary 330.67'18.0" Round Culvert L= 15.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 330.67' / 329.00' S= 0.1113 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Device 1 330.67'2.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 332.00'1.0" Vert. Orifice/Grate C= 0.600 #4 Primary 333.00'6.0" Vert. Orifice/Grate C= 0.600 #5 Device 1 333.50'48.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 #6 Primary 333.75'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 39HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Primary OutFlow Max=0.24 cfs @ 16.57 hrs HW=332.58' (Free Discharge) 1=Culvert (Passes 0.24 cfs of 7.22 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.22 cfs @ 6.46 fps) 3=Orifice/Grate (Orifice Controls 0.02 cfs @ 3.52 fps) 5=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 6=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Pond 150P: GravelWet2 InflowPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=7.060 ac Peak Elev=332.58' Storage=24,367 cf 13.49 cfs 0.24 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 40HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 151L: Study2 Inflow Area = 33.820 ac, Inflow Depth = 0.28" for 1 Year event Inflow = 0.33 cfs @ 16.01 hrs, Volume= 0.789 af Primary = 0.33 cfs @ 16.01 hrs, Volume= 0.789 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 151L: Study2 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=33.820 ac 0.33 cfs0.33 cfs Type II 24-hr 1 Year Rainfall=1.90"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 41HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 152L: SN4 Inflow Area = 33.820 ac, Inflow Depth = 0.28" for 1 Year event Inflow = 0.33 cfs @ 16.01 hrs, Volume= 0.789 af Primary = 0.33 cfs @ 16.01 hrs, Volume= 0.789 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 152L: SN4 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Inflow Area=33.820 ac 0.33 cfs0.33 cfs Qp10 2S Pre2 8L SN4 Routing Diagram for Hillside2020-prePrepared by Krebs & Lansing Consulting Engineers, Inc., Printed 9/15/2021 HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Hillside2020-pre Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 2HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Project Notes Hillside @ O'Brien Farm Apartments Pre Development Stormwater Model Qp10 & Qp100 Hillside2020-pre Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 3HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 19.200 58 Workbook (2S) 19.200 58 TOTAL AREA Type II 24-hr 10 Year Rainfall=3.20"Hillside2020-pre Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 4HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Time span=5.00-48.00 hrs, dt=0.05 hrs, 861 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=19.200 ac Runoff Depth=0.34"Subcatchment 2S: Pre2 Tc=23.4 min CN=58 Runoff=3.46 cfs 0.546 af Inflow=3.46 cfs 0.546 afLink 8L: SN4 Primary=3.46 cfs 0.546 af Total Runoff Area = 19.200 ac Runoff Volume = 0.546 af Average Runoff Depth = 0.34" Type II 24-hr 10 Year Rainfall=3.20"Hillside2020-pre Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 5HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 2S: Pre2 Area to 24" Culvert on Kennedy Drive east of Windridge Runoff = 3.46 cfs @ 12.25 hrs, Volume= 0.546 af, Depth= 0.34" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 10 Year Rainfall=3.20" Area (ac) CN Description * 19.200 58 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 23.4 Direct Entry, Workbook-Lag Subcatchment 2S: Pre2 Runoff Hydrograph Time (hours)48474645444342414039383736353433323130292827262524232221201918171615141312111098765Flow (cfs)3 2 1 0 Type II 24-hr 10 Year Rainfall=3.20" Runoff Area=19.200 ac Runoff Volume=0.546 af Runoff Depth=0.34" Tc=23.4 min CN=58 3.46 cfs Type II 24-hr 10 Year Rainfall=3.20"Hillside2020-pre Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 6HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 8L: SN4 Inflow Area = 19.200 ac, Inflow Depth = 0.34" for 10 Year event Inflow = 3.46 cfs @ 12.25 hrs, Volume= 0.546 af Primary = 3.46 cfs @ 12.25 hrs, Volume= 0.546 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Link 8L: SN4 Inflow Primary Hydrograph Time (hours) 484644424038363432302826242220181614121086Flow (cfs)3 2 1 0 Inflow Area=19.200 ac 3.46 cfs3.46 cfs Qp10 Grass Channels, Pond A, Infiltration A Unchanged Infiltration Trenches Unchanged 155S SWMA156S GCA1 157S GCA2 158S GCA3 159S CB63/64 160S CB65/66 161S CB66/67 162S CB65A/66A 179S SWMC 180S SWMB 165R GC-A1 166R GC-A2 167R GC-A3 168P Pond A 169P Infiltration A 170P Infiltration Trench63 171P Infiltration Trench65 172P Infiltration Trench67 173P Infiltration Trench65A 174P GravelWet1 175P GravelWet2 176L Study2 177L SN4 Routing Diagram for Hillside2020-postPrepared by Krebs & Lansing Consulting Engineers, Inc., Printed 9/15/2021 HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 2HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Project Notes Hillside @ O'Brien Farm Eldredge Street, Kennedy Drive, Old Farm Road South Burlington, Vermont Post Development Stormwater Model Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 3HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 6.330 39 >75% Grass cover, Good, HSG A (155S, 156S, 157S, 158S, 159S, 160S, 161S, 162S) 0.370 61 >75% Grass cover, Good, HSG B (155S) 3.520 74 >75% Grass cover, Good, HSG C (155S) 4.160 80 >75% Grass cover, Good, HSG D (155S, 156S, 157S) 4.670 98 Paved parking, HSG A (155S, 159S, 160S, 161S, 162S) 3.810 98 Roofs, HSG A (155S, 156S, 157S, 158S) 0.200 98 Water Surface, 0% imp, HSG A (155S) 0.730 30 Woods, Good, HSG A (155S, 156S, 157S) 0.910 77 Woods, Good, HSG D (155S, 156S, 157S) 7.060 87 Workbook (179S) 2.060 88 Workbook (180S) 33.820 77 TOTAL AREA Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 4HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Time span=0.00-128.00 hrs, dt=0.01 hrs, 12801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=20.360 ac Runoff Depth=1.55"Subcatchment 155S: SWMA Flow Length=1,465' Tc=6.8 min CN=74 Runoff=49.02 cfs 2.630 af Runoff Area=1.940 ac Runoff Depth=1.13"Subcatchment 156S: GCA1 Flow Length=168' Tc=4.5 min CN=67 Runoff=3.90 cfs 0.183 af Runoff Area=1.200 ac Runoff Depth=0.68"Subcatchment 157S: GCA2 Flow Length=138' Tc=4.5 min CN=51 Runoff=1.36 cfs 0.068 af Runoff Area=0.650 ac Runoff Depth=2.04"Subcatchment 158S: GCA3 Tc=1.0 min CN=79 Runoff=2.35 cfs 0.111 af Runoff Area=0.170 ac Runoff Depth=2.49"Subcatchment 159S: CB63/64 Tc=1.0 min CN=88 Runoff=0.75 cfs 0.035 af Runoff Area=0.100 ac Runoff Depth=2.41"Subcatchment 160S: CB65/66 Tc=1.0 min CN=86 Runoff=0.43 cfs 0.020 af Runoff Area=0.170 ac Runoff Depth=2.49"Subcatchment 161S: CB66/67 Tc=1.0 min CN=88 Runoff=0.75 cfs 0.035 af Runoff Area=0.110 ac Runoff Depth=2.47"Subcatchment 162S: CB65A/66A Tc=1.0 min CN=87 Runoff=0.48 cfs 0.023 af Runoff Area=7.060 ac Runoff Depth=1.96"Subcatchment 179S: SWMC Tc=4.9 min CN=87 Runoff=25.28 cfs 1.153 af Runoff Area=2.060 ac Runoff Depth=2.04"Subcatchment 180S: SWMB Tc=4.7 min CN=88 Runoff=7.69 cfs 0.351 af Avg. Flow Depth=0.55' Max Vel=0.73 fps Inflow=3.90 cfs 0.183 afReach 165R: GC-A1 n=0.120 L=440.0' S=0.0107 '/' Capacity=9.42 cfs Outflow=2.64 cfs 0.183 af Avg. Flow Depth=0.32' Max Vel=0.72 fps Inflow=1.36 cfs 0.068 afReach 166R: GC-A2 n=0.150 L=252.0' S=0.0321 '/' Capacity=9.60 cfs Outflow=1.13 cfs 0.068 af Avg. Flow Depth=0.48' Max Vel=0.65 fps Inflow=2.35 cfs 0.111 afReach 167R: GC-A3 n=0.125 L=520.0' S=0.0121 '/' Capacity=5.84 cfs Outflow=1.40 cfs 0.111 af Peak Elev=334.50' Storage=76,708 cf Inflow=50.78 cfs 2.992 afPond 168P: Pond A Outflow=7.70 cfs 2.992 af Peak Elev=331.60' Storage=4,469 cf Inflow=7.70 cfs 2.992 afPond 169P: Infiltration A Discarded=6.51 cfs 2.992 af Primary=0.00 cfs 0.000 af Outflow=6.51 cfs 2.992 af Peak Elev=348.48' Storage=121 cf Inflow=0.75 cfs 0.035 afPond 170P: Infiltration Trench63 Discarded=0.06 cfs 0.025 af Primary=0.68 cfs 0.010 af Outflow=0.74 cfs 0.035 af Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 5HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Peak Elev=335.63' Storage=85 cf Inflow=0.43 cfs 0.020 afPond 171P: Infiltration Trench65 Discarded=0.04 cfs 0.016 af Primary=0.38 cfs 0.005 af Outflow=0.43 cfs 0.020 af Peak Elev=329.27' Storage=109 cf Inflow=0.75 cfs 0.035 afPond 172P: Infiltration Trench67 Discarded=0.06 cfs 0.025 af Primary=0.90 cfs 0.010 af Outflow=0.96 cfs 0.035 af Peak Elev=341.91' Storage=62 cf Inflow=0.48 cfs 0.023 afPond 173P: Infiltration Trench65A Discarded=0.04 cfs 0.016 af Primary=0.44 cfs 0.007 af Outflow=0.48 cfs 0.023 af Peak Elev=328.58' Storage=12,302 cf Inflow=9.46 cfs 0.381 afPond 174P: GravelWet1 Outflow=0.39 cfs 0.381 af Peak Elev=333.54' Storage=37,609 cf Inflow=25.28 cfs 1.153 afPond 175P: GravelWet2 Outflow=0.95 cfs 1.153 af Inflow=1.30 cfs 1.534 afLink 176L: Study2 Primary=1.30 cfs 1.534 af Inflow=1.30 cfs 1.534 afLink 177L: SN4 Primary=1.30 cfs 1.534 af Total Runoff Area = 33.820 ac Runoff Volume = 4.609 af Average Runoff Depth = 1.64" Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 6HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 155S: SWMA Runoff = 49.02 cfs @ 11.98 hrs, Volume= 2.630 af, Depth= 1.55" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 2.880 98 Roofs, HSG A 4.220 98 Paved parking, HSG A 0.200 98 Water Surface, 0% imp, HSG A 5.250 39 >75% Grass cover, Good, HSG A 0.370 61 >75% Grass cover, Good, HSG B 3.520 74 >75% Grass cover, Good, HSG C 3.770 80 >75% Grass cover, Good, HSG D 0.020 30 Woods, Good, HSG A 0.130 77 Woods, Good, HSG D 20.360 74 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.2 20 0.0500 0.10 Sheet Flow, yard Grass: Dense n= 0.240 P2= 2.30" 1.8 220 0.0160 2.04 Shallow Concentrated Flow, swale Unpaved Kv= 16.1 fps 1.8 1,225 0.0450 11.17 13.70 Pipe Channel, Piped 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 6.8 1,465 Total Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 7HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcatchment 155S: SWMA Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=20.360 ac Runoff Volume=2.630 af Runoff Depth=1.55" Flow Length=1,465' Tc=6.8 min CN=74 49.02 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 8HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 156S: GCA1 Runoff = 3.90 cfs @ 11.96 hrs, Volume= 0.183 af, Depth= 1.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.290 98 Roofs, HSG A 0.320 30 Woods, Good, HSG A 0.680 77 Woods, Good, HSG D 0.320 39 >75% Grass cover, Good, HSG A 0.330 80 >75% Grass cover, Good, HSG D 1.940 67 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 140 0.2000 7.20 Shallow Concentrated Flow, shallow Unpaved Kv= 16.1 fps 4.5 168 Total Subcatchment 156S: GCA1 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)4 3 2 1 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=1.940 ac Runoff Volume=0.183 af Runoff Depth=1.13" Flow Length=168' Tc=4.5 min CN=67 3.90 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 9HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 157S: GCA2 Runoff = 1.36 cfs @ 11.95 hrs, Volume= 0.068 af, Depth= 0.68" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.200 98 Roofs, HSG A 0.390 30 Woods, Good, HSG A 0.100 77 Woods, Good, HSG D 0.450 39 >75% Grass cover, Good, HSG A 0.060 80 >75% Grass cover, Good, HSG D 1.200 51 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 110 0.1090 5.32 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.5 138 Total Subcatchment 157S: GCA2 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=1.200 ac Runoff Volume=0.068 af Runoff Depth=0.68" Flow Length=138' Tc=4.5 min CN=51 1.36 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 10HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 158S: GCA3 Runoff = 2.35 cfs @ 11.91 hrs, Volume= 0.111 af, Depth= 2.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.440 98 Roofs, HSG A 0.210 39 >75% Grass cover, Good, HSG A 0.650 79 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 158S: GCA3 Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)2 1 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=0.650 ac Runoff Volume=0.111 af Runoff Depth=2.04" Tc=1.0 min CN=79 2.35 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 11HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 159S: CB63/64 Undeveloped area draining to Pond 2 Runoff = 0.75 cfs @ 11.91 hrs, Volume= 0.035 af, Depth= 2.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 159S: CB63/64 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=0.170 ac Runoff Volume=0.035 af Runoff Depth=2.49" Tc=1.0 min CN=88 0.75 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 12HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 160S: CB65/66 Undeveloped area draining to Pond 2 Runoff = 0.43 cfs @ 11.91 hrs, Volume= 0.020 af, Depth= 2.41" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.080 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.100 86 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 160S: CB65/66 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=0.100 ac Runoff Volume=0.020 af Runoff Depth=2.41" Tc=1.0 min CN=86 0.43 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 13HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 161S: CB66/67 Undeveloped area draining to Pond 2 Runoff = 0.75 cfs @ 11.91 hrs, Volume= 0.035 af, Depth= 2.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 161S: CB66/67 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=0.170 ac Runoff Volume=0.035 af Runoff Depth=2.49" Tc=1.0 min CN=88 0.75 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 14HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 162S: CB65A/66A Undeveloped area draining to Pond 2 Runoff = 0.48 cfs @ 11.91 hrs, Volume= 0.023 af, Depth= 2.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.090 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.110 87 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 162S: CB65A/66A Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=0.110 ac Runoff Volume=0.023 af Runoff Depth=2.47" Tc=1.0 min CN=87 0.48 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 15HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 179S: SWMC Runoff = 25.28 cfs @ 11.96 hrs, Volume= 1.153 af, Depth= 1.96" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description * 7.060 87 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.9 Direct Entry, Workbook-Lag Subcatchment 179S: SWMC Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=7.060 ac Runoff Volume=1.153 af Runoff Depth=1.96" Tc=4.9 min CN=87 25.28 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 16HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 180S: SWMB Runoff = 7.69 cfs @ 11.96 hrs, Volume= 0.351 af, Depth= 2.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description * 2.060 88 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.7 Direct Entry, Workbook- Lag Subcatchment 180S: SWMB Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)8 7 6 5 4 3 2 1 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=2.060 ac Runoff Volume=0.351 af Runoff Depth=2.04" Tc=4.7 min CN=88 7.69 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 17HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 165R: GC-A1 Inflow Area = 1.940 ac, Inflow Depth = 1.13" for 10 Year event Inflow = 3.90 cfs @ 11.96 hrs, Volume= 0.183 af Outflow = 2.64 cfs @ 12.18 hrs, Volume= 0.183 af, Atten= 32%, Lag= 13.7 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.73 fps, Min. Travel Time= 10.1 min Avg. Velocity = 0.13 fps, Avg. Travel Time= 54.6 min Peak Storage= 1,596 cf @ 12.02 hrs Average Depth at Peak Storage= 0.55' Bank-Full Depth= 1.08' Flow Area= 8.9 sf, Capacity= 9.42 cfs 5.00' x 1.08' deep channel, n= 0.120 Side Slope Z-value= 3.0 '/' Top Width= 11.48' Length= 440.0' Slope= 0.0107 '/' Inlet Invert= 361.70', Outlet Invert= 357.00' ‡ Reach 165R: GC-A1 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)4 3 2 1 0 Inflow Area=1.940 ac Avg. Flow Depth=0.55' Max Vel=0.73 fps n=0.120 L=440.0' S=0.0107 '/' Capacity=9.42 cfs 3.90 cfs 2.64 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 18HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 166R: GC-A2 Inflow Area = 1.200 ac, Inflow Depth = 0.68" for 10 Year event Inflow = 1.36 cfs @ 11.95 hrs, Volume= 0.068 af Outflow = 1.13 cfs @ 12.09 hrs, Volume= 0.068 af, Atten= 17%, Lag= 8.3 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.72 fps, Min. Travel Time= 5.8 min Avg. Velocity = 0.15 fps, Avg. Travel Time= 27.7 min Peak Storage= 393 cf @ 11.99 hrs Average Depth at Peak Storage= 0.32' Bank-Full Depth= 1.00' Flow Area= 7.0 sf, Capacity= 9.60 cfs 4.00' x 1.00' deep channel, n= 0.150 Side Slope Z-value= 3.0 '/' Top Width= 10.00' Length= 252.0' Slope= 0.0321 '/' Inlet Invert= 365.10', Outlet Invert= 357.00' ‡ Reach 166R: GC-A2 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Inflow Area=1.200 ac Avg. Flow Depth=0.32' Max Vel=0.72 fps n=0.150 L=252.0' S=0.0321 '/' Capacity=9.60 cfs 1.36 cfs 1.13 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 19HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 167R: GC-A3 Inflow Area = 0.650 ac, Inflow Depth = 2.04" for 10 Year event Inflow = 2.35 cfs @ 11.91 hrs, Volume= 0.111 af Outflow = 1.40 cfs @ 12.18 hrs, Volume= 0.111 af, Atten= 41%, Lag= 16.5 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.65 fps, Min. Travel Time= 13.3 min Avg. Velocity = 0.13 fps, Avg. Travel Time= 64.6 min Peak Storage= 1,115 cf @ 11.96 hrs Average Depth at Peak Storage= 0.48' Bank-Full Depth= 1.00' Flow Area= 6.0 sf, Capacity= 5.84 cfs 3.00' x 1.00' deep channel, n= 0.125 Side Slope Z-value= 3.0 '/' Top Width= 9.00' Length= 520.0' Slope= 0.0121 '/' Inlet Invert= 342.67', Outlet Invert= 336.40' ‡ Reach 167R: GC-A3 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)2 1 0 Inflow Area=0.650 ac Avg. Flow Depth=0.48' Max Vel=0.65 fps n=0.125 L=520.0' S=0.0121 '/' Capacity=5.84 cfs 2.35 cfs 1.40 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 20HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 168P: Pond A Inflow Area = 24.150 ac, Inflow Depth = 1.49" for 10 Year event Inflow = 50.78 cfs @ 11.98 hrs, Volume= 2.992 af Outflow = 7.70 cfs @ 12.37 hrs, Volume= 2.992 af, Atten= 85%, Lag= 23.0 min Primary = 7.70 cfs @ 12.37 hrs, Volume= 2.992 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 331.25' Surf.Area= 13,348 sf Storage= 23,564 cf Peak Elev= 334.50' @ 12.37 hrs Surf.Area= 19,712 sf Storage= 76,708 cf (53,144 cf above start) Plug-Flow detention time= 256.7 min calculated for 2.451 af (82% of inflow) Center-of-Mass det. time= 119.0 min ( 905.3 - 786.3 ) Volume Invert Avail.Storage Storage Description #1 327.25' 120,624 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 327.25 37 0 0 327.75 2,014 513 513 328.00 2,516 566 1,079 329.00 4,793 3,655 4,734 330.00 6,677 5,735 10,469 331.00 12,941 9,809 20,278 332.00 14,567 13,754 34,032 333.00 16,466 15,517 49,548 334.00 18,587 17,527 67,075 335.00 20,824 19,706 86,780 336.00 23,135 21,980 108,760 336.50 24,321 11,864 120,624 Device Routing Invert Outlet Devices #1 Primary 331.15'15.0" Round Culvert L= 20.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 331.15' / 331.00' S= 0.0075 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 331.25'12.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 332.75'48.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 #4 Primary 335.75'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Primary OutFlow Max=7.70 cfs @ 12.37 hrs HW=334.50' (Free Discharge) 1=Culvert (Inlet Controls 7.70 cfs @ 6.28 fps) 2=Orifice/Grate (Passes < 6.27 cfs potential flow) 3=Orifice/Grate (Passes < 21.41 cfs potential flow) 4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 21HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 168P: Pond A Inflow Primary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)55 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=24.150 ac Peak Elev=334.50' Storage=76,708 cf 50.78 cfs 7.70 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 22HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 169P: Infiltration A Inflow Area = 24.150 ac, Inflow Depth = 1.49" for 10 Year event Inflow = 7.70 cfs @ 12.37 hrs, Volume= 2.992 af Outflow = 6.51 cfs @ 12.01 hrs, Volume= 2.992 af, Atten= 16%, Lag= 0.0 min Discarded = 6.51 cfs @ 12.01 hrs, Volume= 2.992 af Primary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 331.60' @ 13.54 hrs Surf.Area= 7,823 sf Storage= 4,469 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 4.0 min ( 909.3 - 905.3 ) Volume Invert Avail.Storage Storage Description #1 331.00' 27,230 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 331.00 7,013 0 0 332.00 8,357 7,685 7,685 333.00 9,758 9,058 16,743 334.00 11,216 10,487 27,230 Device Routing Invert Outlet Devices #1 Discarded 331.00'40.000 in/hr Exfiltration over Surface area below 331.01' #2 Primary 331.75'6.0" Vert. Orifice/Grate C= 0.600 #3 Primary 333.25'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Discarded OutFlow Max=6.51 cfs @ 12.01 hrs HW=331.03' (Free Discharge) 1=Exfiltration (Exfiltration Controls 6.51 cfs) Primary OutFlow Max=0.00 cfs @ 0.00 hrs HW=331.00' (Free Discharge) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 23HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 169P: Infiltration A Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)8 7 6 5 4 3 2 1 0 Inflow Area=24.150 ac Peak Elev=331.60' Storage=4,469 cf 7.70 cfs 6.51 cfs6.51 cfs 0.00 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 24HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 170P: Infiltration Trench63 Inflow Area = 0.170 ac, Inflow Depth = 2.49" for 10 Year event Inflow = 0.75 cfs @ 11.91 hrs, Volume= 0.035 af Outflow = 0.74 cfs @ 11.91 hrs, Volume= 0.035 af, Atten= 1%, Lag= 0.2 min Discarded = 0.06 cfs @ 11.53 hrs, Volume= 0.025 af Primary = 0.68 cfs @ 11.91 hrs, Volume= 0.010 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 348.48' @ 11.91 hrs Surf.Area= 102 sf Storage= 121 cf Plug-Flow detention time= 6.0 min calculated for 0.035 af (100% of inflow) Center-of-Mass det. time= 6.0 min ( 753.6 - 747.6 ) Volume Invert Avail.Storage Storage Description #1 352.80' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 346.18' 72 cf 3.25'W x 31.50'L x 2.42'H Field A 248 cf Overall - 67 cf Embedded = 181 cf x 40.0% Voids #3A 346.51' 54 cf ADS N-12 18 x 2 Inside #2 Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= -10.00' x 1.80 sf x 1 rows 156 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 352.80 20 0 0 353.30 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 346.18'25.000 in/hr Exfiltration over Surface area below 346.19' #2 Primary 348.09'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.06 cfs @ 11.53 hrs HW=346.25' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.06 cfs) Primary OutFlow Max=0.68 cfs @ 11.91 hrs HW=348.47' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.68 cfs @ 2.11 fps) Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 25HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 170P: Infiltration Trench63 - Chamber Wizard Field A Chamber Model = ADS N-12 18 (ADS N-12® Pipe) Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= -10.00' x 1.80 sf x 1 rows 2 Chambers/Row x 20.00' Long -10.00' Row Adjustment = 30.00' Row Length +9.0" End Stone x 2 = 31.50' Base Length 1 Rows x 21.0" Wide + 9.0" Side Stone x 2 = 3.25' Base Width 4.0" Base + 21.0" Chamber Height + 4.0" Cover = 2.42' Field Height 2 Chambers x 36.0 cf -10.00' Row Adjustment x 1.80 sf x 1 Rows = 54.0 cf Chamber Storage 2 Chambers x 44.5 cf -10.00' Row Adjustment x 2.23 sf x 1 Rows = 66.8 cf Displacement 247.5 cf Field - 66.8 cf Chambers = 180.7 cf Stone x 40.0% Voids = 72.3 cf Stone Storage Chamber Storage + Stone Storage = 126.3 cf = 0.003 af Overall Storage Efficiency = 51.0% 2 Chambers 9.2 cy Field 6.7 cy Stone Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 26HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 170P: Infiltration Trench63 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.170 ac Peak Elev=348.48' Storage=121 cf 0.75 cfs0.74 cfs 0.06 cfs 0.68 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 27HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 171P: Infiltration Trench65 Inflow Area = 0.100 ac, Inflow Depth = 2.41" for 10 Year event Inflow = 0.43 cfs @ 11.91 hrs, Volume= 0.020 af Outflow = 0.43 cfs @ 11.91 hrs, Volume= 0.020 af, Atten= 1%, Lag= 0.2 min Discarded = 0.04 cfs @ 11.56 hrs, Volume= 0.016 af Primary = 0.38 cfs @ 11.91 hrs, Volume= 0.005 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Peak Elev= 335.63' @ 11.91 hrs Surf.Area= 76 sf Storage= 85 cf Plug-Flow detention time= 6.1 min calculated for 0.020 af (100% of inflow) Center-of-Mass det. time= 6.1 min ( 753.7 - 747.6 ) Volume Invert Avail.Storage Storage Description #1 339.60' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 333.52' 54 cf 3.25'W x 23.50'L x 2.42'H Field A 185 cf Overall - 49 cf Embedded = 136 cf x 40.0% Voids #3A 333.85' 40 cf ADS N-12 18 Inside #2 Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= +2.00' x 1.80 sf x 1 rows 124 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 339.60 20 0 0 340.10 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 333.52'25.000 in/hr Exfiltration over Surface area below 333.53' #2 Primary 335.35'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.04 cfs @ 11.56 hrs HW=333.60' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.38 cfs @ 11.91 hrs HW=335.63' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.38 cfs @ 1.81 fps) Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 28HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 171P: Infiltration Trench65 - Chamber Wizard Field A Chamber Model = ADS N-12 18 (ADS N-12® Pipe) Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= +2.00' x 1.80 sf x 1 rows 1 Chambers/Row x 20.00' Long +2.00' Row Adjustment = 22.00' Row Length +9.0" End Stone x 2 = 23.50' Base Length 1 Rows x 21.0" Wide + 9.0" Side Stone x 2 = 3.25' Base Width 4.0" Base + 21.0" Chamber Height + 4.0" Cover = 2.42' Field Height 1 Chambers x 36.0 cf +2.00' Row Adjustment x 1.80 sf x 1 Rows = 39.6 cf Chamber Storage 1 Chambers x 44.5 cf +2.00' Row Adjustment x 2.23 sf x 1 Rows = 49.0 cf Displacement 184.6 cf Field - 49.0 cf Chambers = 135.7 cf Stone x 40.0% Voids = 54.3 cf Stone Storage Chamber Storage + Stone Storage = 93.9 cf = 0.002 af Overall Storage Efficiency = 50.8% 1 Chambers 6.8 cy Field 5.0 cy Stone Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 29HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 171P: Infiltration Trench65 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.100 ac Peak Elev=335.63' Storage=85 cf 0.43 cfs0.43 cfs 0.04 cfs 0.38 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 30HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 172P: Infiltration Trench67 Inflow Area = 0.170 ac, Inflow Depth = 2.49" for 10 Year event Inflow = 0.75 cfs @ 11.91 hrs, Volume= 0.035 af Outflow = 0.96 cfs @ 11.91 hrs, Volume= 0.035 af, Atten= 0%, Lag= 0.0 min Discarded = 0.06 cfs @ 11.55 hrs, Volume= 0.025 af Primary = 0.90 cfs @ 11.91 hrs, Volume= 0.010 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 329.27' @ 11.91 hrs Surf.Area= 103 sf Storage= 109 cf Plug-Flow detention time= (not calculated: outflow precedes inflow) Center-of-Mass det. time= 7.3 min ( 754.9 - 747.6 ) Volume Invert Avail.Storage Storage Description #1 333.27' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 27.52' 67 cf 2.83'W x 36.33'L x 2.17'H Field A 223 cf Overall - 56 cf Embedded = 167 cf x 40.0% Voids #3A 27.85' 42 cf ADS N-12 15 x 2 Inside #2 Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= -5.00' x 1.20 sf x 1 rows 139 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 333.27 20 0 0 333.77 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 27.52'25.000 in/hr Exfiltration over Surface area below 327.53' #2 Primary 329.02'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.06 cfs @ 11.55 hrs HW=27.86' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.06 cfs) Primary OutFlow Max=0.30 cfs @ 11.91 hrs HW=329.27' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.30 cfs @ 1.70 fps) Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 31HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 172P: Infiltration Trench67 - Chamber Wizard Field A Chamber Model = ADS N-12 15 (ADS N-12® Pipe) Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= -5.00' x 1.20 sf x 1 rows 2 Chambers/Row x 20.00' Long -5.00' Row Adjustment = 35.00' Row Length +8.0" End Stone x 2 = 36.33' Base Length 1 Rows x 18.0" Wide + 8.0" Side Stone x 2 = 2.83' Base Width 4.0" Base + 18.0" Chamber Height + 4.0" Cover = 2.17' Field Height 2 Chambers x 24.0 cf -5.00' Row Adjustment x 1.20 sf x 1 Rows = 42.0 cf Chamber Storage 2 Chambers x 31.9 cf -5.00' Row Adjustment x 1.60 sf x 1 Rows = 55.9 cf Displacement 222.9 cf Field - 55.9 cf Chambers = 167.1 cf Stone x 40.0% Voids = 66.8 cf Stone Storage Chamber Storage + Stone Storage = 108.8 cf = 0.002 af Overall Storage Efficiency = 48.8% 2 Chambers 8.3 cy Field 6.2 cy Stone Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 32HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 172P: Infiltration Trench67 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Inflow Area=0.170 ac Peak Elev=329.27' Storage=109 cf 0.75 cfs 0.96 cfs 0.06 cfs 0.90 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 33HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 173P: Infiltration Trench65A Inflow Area = 0.110 ac, Inflow Depth = 2.47" for 10 Year event Inflow = 0.48 cfs @ 11.91 hrs, Volume= 0.023 af Outflow = 0.48 cfs @ 11.91 hrs, Volume= 0.023 af, Atten= 1%, Lag= 0.1 min Discarded = 0.04 cfs @ 11.53 hrs, Volume= 0.016 af Primary = 0.44 cfs @ 11.91 hrs, Volume= 0.007 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 341.91' @ 11.91 hrs Surf.Area= 66 sf Storage= 62 cf Plug-Flow detention time= 4.5 min calculated for 0.023 af (100% of inflow) Center-of-Mass det. time= 4.6 min ( 752.2 - 747.6 ) Volume Invert Avail.Storage Storage Description #1 345.68' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 340.02' 43 cf 2.83'W x 23.33'L x 2.17'H Field A 143 cf Overall - 35 cf Embedded = 108 cf x 40.0% Voids #3A 340.35' 26 cf ADS N-12 15 Inside #2 Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= +2.00' x 1.20 sf x 1 rows 100 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 345.68 20 0 0 346.18 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 340.02'25.000 in/hr Exfiltration over Surface area below 340.03' #2 Primary 341.60'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.04 cfs @ 11.53 hrs HW=340.08' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.43 cfs @ 11.91 hrs HW=341.90' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.43 cfs @ 1.88 fps) Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 34HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 173P: Infiltration Trench65A - Chamber Wizard Field A Chamber Model = ADS N-12 15 (ADS N-12® Pipe) Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= +2.00' x 1.20 sf x 1 rows 1 Chambers/Row x 20.00' Long +2.00' Row Adjustment = 22.00' Row Length +8.0" End Stone x 2 = 23.33' Base Length 1 Rows x 18.0" Wide + 8.0" Side Stone x 2 = 2.83' Base Width 4.0" Base + 18.0" Chamber Height + 4.0" Cover = 2.17' Field Height 1 Chambers x 24.0 cf +2.00' Row Adjustment x 1.20 sf x 1 Rows = 26.4 cf Chamber Storage 1 Chambers x 31.9 cf +2.00' Row Adjustment x 1.60 sf x 1 Rows = 35.1 cf Displacement 143.2 cf Field - 35.1 cf Chambers = 108.1 cf Stone x 40.0% Voids = 43.2 cf Stone Storage Chamber Storage + Stone Storage = 69.6 cf = 0.002 af Overall Storage Efficiency = 48.6% 1 Chambers 5.3 cy Field 4.0 cy Stone Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 35HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 173P: Infiltration Trench65A Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.110 ac Peak Elev=341.91' Storage=62 cf 0.48 cfs0.48 cfs 0.04 cfs 0.44 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 36HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 174P: GravelWet1 Inflow Area = 2.610 ac, Inflow Depth = 1.75" for 10 Year event Inflow = 9.46 cfs @ 11.95 hrs, Volume= 0.381 af Outflow = 0.39 cfs @ 12.93 hrs, Volume= 0.381 af, Atten= 96%, Lag= 58.8 min Primary = 0.39 cfs @ 12.93 hrs, Volume= 0.381 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 326.17' Surf.Area= 4,400 sf Storage= 2,125 cf Peak Elev= 328.58' @ 12.93 hrs Surf.Area= 10,731 sf Storage= 12,302 cf (10,177 cf above start) Plug-Flow detention time= 1,092.9 min calculated for 0.333 af (87% of inflow) Center-of-Mass det. time= 891.5 min ( 1,693.8 - 802.3 ) Volume Invert Avail.Storage Storage Description #1 323.50' 2,050 cf Custom Stage Data (Prismatic) Listed below (Recalc) 5,126 cf Overall x 40.0% Voids #2 325.83' 147 cf Custom Stage Data (Prismatic) Listed below (Recalc) 1,474 cf Overall x 10.0% Voids #3 326.50' 20,418 cf Custom Stage Data (Prismatic) Listed below (Recalc) 22,616 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 323.50 2,200 0 0 325.83 2,200 5,126 5,126 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 325.83 2,200 0 0 326.50 2,200 1,474 1,474 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 326.50 2,200 0 0 327.00 4,413 1,653 1,653 328.00 5,610 5,012 6,665 329.00 6,862 6,236 12,901 330.00 8,172 7,517 20,418 Device Routing Invert Outlet Devices #1 Primary 326.17'18.0" Round Culvert L= 75.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 326.17' / 325.80' S= 0.0049 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Device 1 326.17'1.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 327.30'1.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 328.50'48.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 37HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Primary OutFlow Max=0.39 cfs @ 12.93 hrs HW=328.58' (Free Discharge) 1=Culvert (Passes 0.39 cfs of 8.64 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.09 cfs @ 7.37 fps) 3=Orifice/Grate (Orifice Controls 0.03 cfs @ 5.35 fps) 4=Orifice/Grate (Orifice Controls 0.27 cfs @ 0.89 fps) Pond 174P: GravelWet1 Inflow Primary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.610 ac Peak Elev=328.58' Storage=12,302 cf 9.46 cfs 0.39 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 38HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 175P: GravelWet2 Inflow Area = 7.060 ac, Inflow Depth = 1.96" for 10 Year event Inflow = 25.28 cfs @ 11.96 hrs, Volume= 1.153 af Outflow = 0.95 cfs @ 13.51 hrs, Volume= 1.153 af, Atten= 96%, Lag= 93.1 min Primary = 0.95 cfs @ 13.51 hrs, Volume= 1.153 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 330.67' Surf.Area= 15,488 sf Storage= 7,481 cf Peak Elev= 333.54' @ 13.51 hrs Surf.Area= 30,197 sf Storage= 37,609 cf (30,128 cf above start) Plug-Flow detention time= 1,055.3 min calculated for 0.981 af (85% of inflow) Center-of-Mass det. time= 831.9 min ( 1,646.0 - 814.1 ) Volume Invert Avail.Storage Storage Description #1 328.00' 7,217 cf Custom Stage Data (Prismatic) Listed below (Recalc) 18,044 cf Overall x 40.0% Voids #2 330.33' 519 cf Custom Stage Data (Prismatic) Listed below (Recalc) 5,188 cf Overall x 10.0% Voids #3 331.00' 44,909 cf Custom Stage Data (Prismatic) Listed below (Recalc) 52,645 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 328.00 7,744 0 0 330.33 7,744 18,044 18,044 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 330.33 7,744 0 0 331.00 7,744 5,188 5,188 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 331.00 7,744 0 0 332.00 11,537 9,641 9,641 333.00 13,558 12,548 22,188 334.00 15,674 14,616 36,804 334.50 16,744 8,105 44,909 Device Routing Invert Outlet Devices #1 Primary 330.67'18.0" Round Culvert L= 15.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 330.67' / 329.00' S= 0.1113 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Device 1 330.67'2.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 332.00'1.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 333.00'6.0" Vert. Orifice/Grate C= 0.600 #5 Device 1 333.50'48.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 #6 Primary 333.75'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 39HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Primary OutFlow Max=0.94 cfs @ 13.51 hrs HW=333.54' (Free Discharge) 1=Culvert (Passes 0.94 cfs of 9.79 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.27 cfs @ 8.01 fps) 3=Orifice/Grate (Orifice Controls 0.03 cfs @ 5.90 fps) 4=Orifice/Grate (Orifice Controls 0.51 cfs @ 2.61 fps) 5=Orifice/Grate (Orifice Controls 0.12 cfs @ 0.67 fps) 6=Broad-Crested Rectangular Weir ( Controls 0.00 cfs) Pond 175P: GravelWet2 InflowPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=7.060 ac Peak Elev=333.54' Storage=37,609 cf 25.28 cfs 0.95 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 40HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 176L: Study2 Inflow Area = 33.820 ac, Inflow Depth = 0.54" for 10 Year event Inflow = 1.30 cfs @ 13.39 hrs, Volume= 1.534 af Primary = 1.30 cfs @ 13.39 hrs, Volume= 1.534 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 176L: Study2 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Inflow Area=33.820 ac 1.30 cfs1.30 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 41HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 177L: SN4 Inflow Area = 33.820 ac, Inflow Depth = 0.54" for 10 Year event Inflow = 1.30 cfs @ 13.39 hrs, Volume= 1.534 af Primary = 1.30 cfs @ 13.39 hrs, Volume= 1.534 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 177L: SN4 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Inflow Area=33.820 ac 1.30 cfs1.30 cfs Qp10-No Routing 155S SWMA156S GCA1 157S GCA2 158S GCA3 159S CB63/64 160S CB65/66 161S CB66/67 162S CB65A/66A 179S SWMC 180S SWMB 176L Study2 177L SN4 Routing Diagram for Hillside2020-post-no-routingPrepared by Krebs & Lansing Consulting Engineers, Inc., Printed 9/15/2021 HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 2HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Project Notes Hillside @ O'Brien Farm Eldredge Street, Kennedy Drive, Old Farm Road South Burlington, Vermont Post Development Stormwater Model - No Routing Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 3HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 6.330 39 >75% Grass cover, Good, HSG A (155S, 156S, 157S, 158S, 159S, 160S, 161S, 162S) 0.370 61 >75% Grass cover, Good, HSG B (155S) 3.520 74 >75% Grass cover, Good, HSG C (155S) 4.160 80 >75% Grass cover, Good, HSG D (155S, 156S, 157S) 4.670 98 Paved parking, HSG A (155S, 159S, 160S, 161S, 162S) 3.810 98 Roofs, HSG A (155S, 156S, 157S, 158S) 0.200 98 Water Surface, 0% imp, HSG A (155S) 0.730 30 Woods, Good, HSG A (155S, 156S, 157S) 0.910 77 Woods, Good, HSG D (155S, 156S, 157S) 7.060 87 Workbook (179S) 2.060 88 Workbook (180S) 33.820 77 TOTAL AREA Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 4HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Time span=0.00-128.00 hrs, dt=0.01 hrs, 12801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=20.360 ac Runoff Depth=1.55"Subcatchment 155S: SWMA Flow Length=1,465' Tc=6.8 min CN=74 Runoff=49.02 cfs 2.630 af Runoff Area=1.940 ac Runoff Depth=1.13"Subcatchment 156S: GCA1 Flow Length=168' Tc=4.5 min CN=67 Runoff=3.90 cfs 0.183 af Runoff Area=1.200 ac Runoff Depth=0.68"Subcatchment 157S: GCA2 Flow Length=138' Tc=4.5 min CN=51 Runoff=1.36 cfs 0.068 af Runoff Area=0.650 ac Runoff Depth=2.04"Subcatchment 158S: GCA3 Tc=1.0 min CN=79 Runoff=2.35 cfs 0.111 af Runoff Area=0.170 ac Runoff Depth=2.49"Subcatchment 159S: CB63/64 Tc=1.0 min CN=88 Runoff=0.75 cfs 0.035 af Runoff Area=0.100 ac Runoff Depth=2.41"Subcatchment 160S: CB65/66 Tc=1.0 min CN=86 Runoff=0.43 cfs 0.020 af Runoff Area=0.170 ac Runoff Depth=2.49"Subcatchment 161S: CB66/67 Tc=1.0 min CN=88 Runoff=0.75 cfs 0.035 af Runoff Area=0.110 ac Runoff Depth=2.47"Subcatchment 162S: CB65A/66A Tc=1.0 min CN=87 Runoff=0.48 cfs 0.023 af Runoff Area=7.060 ac Runoff Depth=1.96"Subcatchment 179S: SWMC Tc=4.9 min CN=87 Runoff=25.28 cfs 1.153 af Runoff Area=2.060 ac Runoff Depth=2.04"Subcatchment 180S: SWMB Tc=4.7 min CN=88 Runoff=7.69 cfs 0.351 af Inflow=88.99 cfs 4.609 afLink 176L: Study2 Primary=88.99 cfs 4.609 af Inflow=88.99 cfs 4.609 afLink 177L: SN4 Primary=88.99 cfs 4.609 af Total Runoff Area = 33.820 ac Runoff Volume = 4.609 af Average Runoff Depth = 1.64" Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 5HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 155S: SWMA Runoff = 49.02 cfs @ 11.98 hrs, Volume= 2.630 af, Depth= 1.55" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 2.880 98 Roofs, HSG A 4.220 98 Paved parking, HSG A 0.200 98 Water Surface, 0% imp, HSG A 5.250 39 >75% Grass cover, Good, HSG A 0.370 61 >75% Grass cover, Good, HSG B 3.520 74 >75% Grass cover, Good, HSG C 3.770 80 >75% Grass cover, Good, HSG D 0.020 30 Woods, Good, HSG A 0.130 77 Woods, Good, HSG D 20.360 74 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.2 20 0.0500 0.10 Sheet Flow, yard Grass: Dense n= 0.240 P2= 2.30" 1.8 220 0.0160 2.04 Shallow Concentrated Flow, swale Unpaved Kv= 16.1 fps 1.8 1,225 0.0450 11.17 13.70 Pipe Channel, Piped 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 6.8 1,465 Total Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 6HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcatchment 155S: SWMA Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=20.360 ac Runoff Volume=2.630 af Runoff Depth=1.55" Flow Length=1,465' Tc=6.8 min CN=74 49.02 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 7HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 156S: GCA1 Runoff = 3.90 cfs @ 11.96 hrs, Volume= 0.183 af, Depth= 1.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.290 98 Roofs, HSG A 0.320 30 Woods, Good, HSG A 0.680 77 Woods, Good, HSG D 0.320 39 >75% Grass cover, Good, HSG A 0.330 80 >75% Grass cover, Good, HSG D 1.940 67 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 140 0.2000 7.20 Shallow Concentrated Flow, shallow Unpaved Kv= 16.1 fps 4.5 168 Total Subcatchment 156S: GCA1 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)4 3 2 1 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=1.940 ac Runoff Volume=0.183 af Runoff Depth=1.13" Flow Length=168' Tc=4.5 min CN=67 3.90 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 8HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 157S: GCA2 Runoff = 1.36 cfs @ 11.95 hrs, Volume= 0.068 af, Depth= 0.68" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.200 98 Roofs, HSG A 0.390 30 Woods, Good, HSG A 0.100 77 Woods, Good, HSG D 0.450 39 >75% Grass cover, Good, HSG A 0.060 80 >75% Grass cover, Good, HSG D 1.200 51 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 110 0.1090 5.32 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.5 138 Total Subcatchment 157S: GCA2 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=1.200 ac Runoff Volume=0.068 af Runoff Depth=0.68" Flow Length=138' Tc=4.5 min CN=51 1.36 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 9HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 158S: GCA3 Runoff = 2.35 cfs @ 11.91 hrs, Volume= 0.111 af, Depth= 2.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.440 98 Roofs, HSG A 0.210 39 >75% Grass cover, Good, HSG A 0.650 79 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 158S: GCA3 Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)2 1 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=0.650 ac Runoff Volume=0.111 af Runoff Depth=2.04" Tc=1.0 min CN=79 2.35 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 10HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 159S: CB63/64 Undeveloped area draining to Pond 2 Runoff = 0.75 cfs @ 11.91 hrs, Volume= 0.035 af, Depth= 2.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 159S: CB63/64 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=0.170 ac Runoff Volume=0.035 af Runoff Depth=2.49" Tc=1.0 min CN=88 0.75 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 11HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 160S: CB65/66 Undeveloped area draining to Pond 2 Runoff = 0.43 cfs @ 11.91 hrs, Volume= 0.020 af, Depth= 2.41" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.080 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.100 86 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 160S: CB65/66 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.46 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 0.28 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=0.100 ac Runoff Volume=0.020 af Runoff Depth=2.41" Tc=1.0 min CN=86 0.43 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 12HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 161S: CB66/67 Undeveloped area draining to Pond 2 Runoff = 0.75 cfs @ 11.91 hrs, Volume= 0.035 af, Depth= 2.49" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 161S: CB66/67 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=0.170 ac Runoff Volume=0.035 af Runoff Depth=2.49" Tc=1.0 min CN=88 0.75 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 13HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 162S: CB65A/66A Undeveloped area draining to Pond 2 Runoff = 0.48 cfs @ 11.91 hrs, Volume= 0.023 af, Depth= 2.47" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description 0.090 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.110 87 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 162S: CB65A/66A Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=0.110 ac Runoff Volume=0.023 af Runoff Depth=2.47" Tc=1.0 min CN=87 0.48 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 14HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 179S: SWMC Runoff = 25.28 cfs @ 11.96 hrs, Volume= 1.153 af, Depth= 1.96" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description * 7.060 87 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.9 Direct Entry, Workbook-Lag Subcatchment 179S: SWMC Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=7.060 ac Runoff Volume=1.153 af Runoff Depth=1.96" Tc=4.9 min CN=87 25.28 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 15HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 180S: SWMB Runoff = 7.69 cfs @ 11.96 hrs, Volume= 0.351 af, Depth= 2.04" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 10 Year Rainfall=3.25" Area (ac) CN Description * 2.060 88 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.7 Direct Entry, Workbook- Lag Subcatchment 180S: SWMB Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)8 7 6 5 4 3 2 1 0 Type II 24-hr 10 Year Rainfall=3.25" Runoff Area=2.060 ac Runoff Volume=0.351 af Runoff Depth=2.04" Tc=4.7 min CN=88 7.69 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 16HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 176L: Study2 Inflow Area = 33.820 ac, Inflow Depth = 1.64" for 10 Year event Inflow = 88.99 cfs @ 11.97 hrs, Volume= 4.609 af Primary = 88.99 cfs @ 11.97 hrs, Volume= 4.609 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 176L: Study2 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=33.820 ac 88.99 cfs88.99 cfs Type II 24-hr 10 Year Rainfall=3.25"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 17HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 177L: SN4 Inflow Area = 33.820 ac, Inflow Depth = 1.64" for 10 Year event Inflow = 88.99 cfs @ 11.97 hrs, Volume= 4.609 af Primary = 88.99 cfs @ 11.97 hrs, Volume= 4.609 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 177L: SN4 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=33.820 ac 88.99 cfs88.99 cfs Qp100 13S Pre2 14L SN4 Routing Diagram for Hillside2020-prePrepared by Krebs & Lansing Consulting Engineers, Inc., Printed 9/15/2021 HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Hillside2020-pre Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 2HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Project Notes Hillside @ O'Brien Farm Apartments Pre Development Stormwater Model Qp10 & Qp100 Hillside2020-pre Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 3HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 19.200 56 Workbook (13S) 19.200 56 TOTAL AREA Type II 24-hr 100 Year Rainfall=5.20"Hillside2020-pre Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 4HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Time span=5.00-48.00 hrs, dt=0.05 hrs, 861 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=19.200 ac Runoff Depth=1.15"Subcatchment 13S: Pre2 Tc=24.4 min CN=56 Runoff=18.09 cfs 1.834 af Inflow=18.09 cfs 1.834 afLink 14L: SN4 Primary=18.09 cfs 1.834 af Total Runoff Area = 19.200 ac Runoff Volume = 1.834 af Average Runoff Depth = 1.15" Type II 24-hr 100 Year Rainfall=5.20"Hillside2020-pre Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 5HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 13S: Pre2 Area to 24" Culvert on Kennedy Drive east of Windridge Runoff = 18.09 cfs @ 12.21 hrs, Volume= 1.834 af, Depth= 1.15" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 100 Year Rainfall=5.20" Area (ac) CN Description * 19.200 56 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 24.4 Direct Entry, Workbook-Lag Subcatchment 13S: Pre2 Runoff Hydrograph Time (hours)48474645444342414039383736353433323130292827262524232221201918171615141312111098765Flow (cfs)20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100 Year Rainfall=5.20" Runoff Area=19.200 ac Runoff Volume=1.834 af Runoff Depth=1.15" Tc=24.4 min CN=56 18.09 cfs Type II 24-hr 100 Year Rainfall=5.20"Hillside2020-pre Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 6HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 14L: SN4 Inflow Area = 19.200 ac, Inflow Depth = 1.15" for 100 Year event Inflow = 18.09 cfs @ 12.21 hrs, Volume= 1.834 af Primary = 18.09 cfs @ 12.21 hrs, Volume= 1.834 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 5.00-48.00 hrs, dt= 0.05 hrs Link 14L: SN4 Inflow Primary Hydrograph Time (hours) 484644424038363432302826242220181614121086Flow (cfs)20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=19.200 ac 18.09 cfs18.09 cfs Qp100 Grass Channels, Pond A, Infiltration A Unchanged Infiltration Trenches Unchanged 181S SWMA182S GCA1 183S GCA2 184S GCA3 185S CB63/64 186S CB65/66 187S CB66/67 188S CB65A/66A 205S SWMB 206S SWMC 191R GC-A1 192R GC-A2 193R GC-A3 194P Pond A 195P Infiltration A 196P Infiltration Trench63 197P Infiltration Trench65 198P Infiltration Trench67 199P Infiltration Trench65A 200P GravelWet1 201P GravelWet2 202L Study2 203L SN4 Routing Diagram for Hillside2020-postPrepared by Krebs & Lansing Consulting Engineers, Inc., Printed 9/15/2021 HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 2HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Project Notes Hillside @ O'Brien Farm Eldredge Street, Kennedy Drive, Old Farm Road South Burlington, Vermont Post Development Stormwater Model Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 3HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 6.330 39 >75% Grass cover, Good, HSG A (181S, 182S, 183S, 184S, 185S, 186S, 187S, 188S) 0.370 61 >75% Grass cover, Good, HSG B (181S) 3.520 74 >75% Grass cover, Good, HSG C (181S) 4.160 80 >75% Grass cover, Good, HSG D (181S, 182S, 183S) 4.670 98 Paved parking, HSG A (181S, 185S, 186S, 187S, 188S) 3.810 98 Roofs, HSG A (181S, 182S, 183S, 184S) 0.200 98 Water Surface, 0% imp, HSG A (181S) 0.730 30 Woods, Good, HSG A (181S, 182S, 183S) 0.910 77 Woods, Good, HSG D (181S, 182S, 183S) 2.060 85 Workbook (205S) 7.060 84 Workbook (206S) 33.820 76 TOTAL AREA Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 4HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Time span=0.00-128.00 hrs, dt=0.01 hrs, 12801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=20.360 ac Runoff Depth=2.64"Subcatchment 181S: SWMA Flow Length=1,465' Tc=6.8 min CN=74 Runoff=82.01 cfs 4.474 af Runoff Area=1.940 ac Runoff Depth=2.06"Subcatchment 182S: GCA1 Flow Length=168' Tc=4.5 min CN=67 Runoff=6.99 cfs 0.334 af Runoff Area=1.200 ac Runoff Depth=1.18"Subcatchment 183S: GCA2 Flow Length=138' Tc=4.5 min CN=51 Runoff=2.23 cfs 0.118 af Runoff Area=0.650 ac Runoff Depth=3.18"Subcatchment 184S: GCA3 Tc=1.0 min CN=79 Runoff=3.53 cfs 0.172 af Runoff Area=0.170 ac Runoff Depth=3.83"Subcatchment 185S: CB63/64 Tc=1.0 min CN=88 Runoff=1.12 cfs 0.054 af Runoff Area=0.100 ac Runoff Depth=3.72"Subcatchment 186S: CB65/66 Tc=1.0 min CN=86 Runoff=0.64 cfs 0.031 af Runoff Area=0.170 ac Runoff Depth=3.83"Subcatchment 187S: CB66/67 Tc=1.0 min CN=88 Runoff=1.12 cfs 0.054 af Runoff Area=0.110 ac Runoff Depth=3.81"Subcatchment 188S: CB65A/66A Tc=1.0 min CN=87 Runoff=0.72 cfs 0.035 af Runoff Area=2.060 ac Runoff Depth=3.23"Subcatchment 205S: SWMB Tc=5.3 min CN=85 Runoff=11.79 cfs 0.554 af Runoff Area=7.060 ac Runoff Depth=3.13"Subcatchment 206S: SWMC Tc=5.5 min CN=84 Runoff=39.17 cfs 1.844 af Avg. Flow Depth=0.79' Max Vel=0.89 fps Inflow=6.99 cfs 0.334 afReach 191R: GC-A1 n=0.120 L=440.0' S=0.0107 '/' Capacity=9.42 cfs Outflow=5.14 cfs 0.334 af Avg. Flow Depth=0.42' Max Vel=0.86 fps Inflow=2.23 cfs 0.118 afReach 192R: GC-A2 n=0.150 L=252.0' S=0.0321 '/' Capacity=9.60 cfs Outflow=1.91 cfs 0.118 af Avg. Flow Depth=0.61' Max Vel=0.75 fps Inflow=3.53 cfs 0.172 afReach 193R: GC-A3 n=0.125 L=520.0' S=0.0121 '/' Capacity=5.84 cfs Outflow=2.22 cfs 0.172 af Peak Elev=336.19' Storage=113,311 cf Inflow=86.02 cfs 5.098 afPond 194P: Pond A Outflow=15.95 cfs 5.098 af Peak Elev=333.40' Storage=20,814 cf Inflow=15.95 cfs 5.098 afPond 195P: Infiltration A Discarded=6.51 cfs 4.630 af Primary=2.28 cfs 0.468 af Outflow=8.79 cfs 5.098 af Peak Elev=348.58' Storage=125 cf Inflow=1.12 cfs 0.054 afPond 196P: Infiltration Trench63 Discarded=0.06 cfs 0.036 af Primary=1.06 cfs 0.018 af Outflow=1.12 cfs 0.054 af Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 5HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Peak Elev=335.71' Storage=87 cf Inflow=0.64 cfs 0.031 afPond 197P: Infiltration Trench65 Discarded=0.04 cfs 0.022 af Primary=0.59 cfs 0.009 af Outflow=0.64 cfs 0.031 af Peak Elev=329.36' Storage=109 cf Inflow=1.12 cfs 0.054 afPond 198P: Infiltration Trench67 Discarded=0.06 cfs 0.036 af Primary=1.22 cfs 0.018 af Outflow=1.28 cfs 0.054 af Peak Elev=341.99' Storage=64 cf Inflow=0.72 cfs 0.035 afPond 199P: Infiltration Trench65A Discarded=0.04 cfs 0.023 af Primary=0.68 cfs 0.012 af Outflow=0.72 cfs 0.035 af Peak Elev=329.01' Storage=15,179 cf Inflow=14.23 cfs 0.613 afPond 200P: GravelWet1 Outflow=4.81 cfs 0.613 af Peak Elev=334.08' Storage=45,730 cf Inflow=39.17 cfs 1.844 afPond 201P: GravelWet2 Outflow=10.23 cfs 1.844 af Inflow=14.90 cfs 2.924 afLink 202L: Study2 Primary=14.90 cfs 2.924 af Inflow=14.90 cfs 2.924 afLink 203L: SN4 Primary=14.90 cfs 2.924 af Total Runoff Area = 33.820 ac Runoff Volume = 7.670 af Average Runoff Depth = 2.72" Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 6HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 181S: SWMA Runoff = 82.01 cfs @ 11.98 hrs, Volume= 4.474 af, Depth= 2.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 2.880 98 Roofs, HSG A 4.220 98 Paved parking, HSG A 0.200 98 Water Surface, 0% imp, HSG A 5.250 39 >75% Grass cover, Good, HSG A 0.370 61 >75% Grass cover, Good, HSG B 3.520 74 >75% Grass cover, Good, HSG C 3.770 80 >75% Grass cover, Good, HSG D 0.020 30 Woods, Good, HSG A 0.130 77 Woods, Good, HSG D 20.360 74 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.2 20 0.0500 0.10 Sheet Flow, yard Grass: Dense n= 0.240 P2= 2.30" 1.8 220 0.0160 2.04 Shallow Concentrated Flow, swale Unpaved Kv= 16.1 fps 1.8 1,225 0.0450 11.17 13.70 Pipe Channel, Piped 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 6.8 1,465 Total Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 7HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcatchment 181S: SWMA Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=20.360 ac Runoff Volume=4.474 af Runoff Depth=2.64" Flow Length=1,465' Tc=6.8 min CN=74 82.01 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 8HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 182S: GCA1 Runoff = 6.99 cfs @ 11.95 hrs, Volume= 0.334 af, Depth= 2.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.290 98 Roofs, HSG A 0.320 30 Woods, Good, HSG A 0.680 77 Woods, Good, HSG D 0.320 39 >75% Grass cover, Good, HSG A 0.330 80 >75% Grass cover, Good, HSG D 1.940 67 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 140 0.2000 7.20 Shallow Concentrated Flow, shallow Unpaved Kv= 16.1 fps 4.5 168 Total Subcatchment 182S: GCA1 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)7 6 5 4 3 2 1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=1.940 ac Runoff Volume=0.334 af Runoff Depth=2.06" Flow Length=168' Tc=4.5 min CN=67 6.99 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 9HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 183S: GCA2 Runoff = 2.23 cfs @ 11.95 hrs, Volume= 0.118 af, Depth= 1.18" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.200 98 Roofs, HSG A 0.390 30 Woods, Good, HSG A 0.100 77 Woods, Good, HSG D 0.450 39 >75% Grass cover, Good, HSG A 0.060 80 >75% Grass cover, Good, HSG D 1.200 51 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 110 0.1090 5.32 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.5 138 Total Subcatchment 183S: GCA2 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)2 1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=1.200 ac Runoff Volume=0.118 af Runoff Depth=1.18" Flow Length=138' Tc=4.5 min CN=51 2.23 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 10HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 184S: GCA3 Runoff = 3.53 cfs @ 11.91 hrs, Volume= 0.172 af, Depth= 3.18" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.440 98 Roofs, HSG A 0.210 39 >75% Grass cover, Good, HSG A 0.650 79 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 184S: GCA3 Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)3 2 1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=0.650 ac Runoff Volume=0.172 af Runoff Depth=3.18" Tc=1.0 min CN=79 3.53 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 11HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 185S: CB63/64 Undeveloped area draining to Pond 2 Runoff = 1.12 cfs @ 11.91 hrs, Volume= 0.054 af, Depth= 3.83" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 185S: CB63/64 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=0.170 ac Runoff Volume=0.054 af Runoff Depth=3.83" Tc=1.0 min CN=88 1.12 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 12HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 186S: CB65/66 Undeveloped area draining to Pond 2 Runoff = 0.64 cfs @ 11.91 hrs, Volume= 0.031 af, Depth= 3.72" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.080 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.100 86 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 186S: CB65/66 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=0.100 ac Runoff Volume=0.031 af Runoff Depth=3.72" Tc=1.0 min CN=86 0.64 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 13HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 187S: CB66/67 Undeveloped area draining to Pond 2 Runoff = 1.12 cfs @ 11.91 hrs, Volume= 0.054 af, Depth= 3.83" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 187S: CB66/67 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=0.170 ac Runoff Volume=0.054 af Runoff Depth=3.83" Tc=1.0 min CN=88 1.12 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 14HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 188S: CB65A/66A Undeveloped area draining to Pond 2 Runoff = 0.72 cfs @ 11.91 hrs, Volume= 0.035 af, Depth= 3.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.090 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.110 87 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 188S: CB65A/66A Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=0.110 ac Runoff Volume=0.035 af Runoff Depth=3.81" Tc=1.0 min CN=87 0.72 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 15HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 205S: SWMB Runoff = 11.79 cfs @ 11.96 hrs, Volume= 0.554 af, Depth= 3.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description * 2.060 85 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.3 Direct Entry, Workbook- Lag Subcatchment 205S: SWMB Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=2.060 ac Runoff Volume=0.554 af Runoff Depth=3.23" Tc=5.3 min CN=85 11.79 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 16HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 206S: SWMC Runoff = 39.17 cfs @ 11.97 hrs, Volume= 1.844 af, Depth= 3.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description * 7.060 84 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.5 Direct Entry, Workbook-Lag Subcatchment 206S: SWMC Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=7.060 ac Runoff Volume=1.844 af Runoff Depth=3.13" Tc=5.5 min CN=84 39.17 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 17HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 191R: GC-A1 Inflow Area = 1.940 ac, Inflow Depth = 2.06" for 100 Year event Inflow = 6.99 cfs @ 11.95 hrs, Volume= 0.334 af Outflow = 5.14 cfs @ 12.14 hrs, Volume= 0.334 af, Atten= 26%, Lag= 11.4 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.89 fps, Min. Travel Time= 8.2 min Avg. Velocity = 0.16 fps, Avg. Travel Time= 45.8 min Peak Storage= 2,545 cf @ 12.01 hrs Average Depth at Peak Storage= 0.79' Bank-Full Depth= 1.08' Flow Area= 8.9 sf, Capacity= 9.42 cfs 5.00' x 1.08' deep channel, n= 0.120 Side Slope Z-value= 3.0 '/' Top Width= 11.48' Length= 440.0' Slope= 0.0107 '/' Inlet Invert= 361.70', Outlet Invert= 357.00' ‡ Reach 191R: GC-A1 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)7 6 5 4 3 2 1 0 Inflow Area=1.940 ac Avg. Flow Depth=0.79' Max Vel=0.89 fps n=0.120 L=440.0' S=0.0107 '/' Capacity=9.42 cfs 6.99 cfs 5.14 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 18HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 192R: GC-A2 Inflow Area = 1.200 ac, Inflow Depth = 1.18" for 100 Year event Inflow = 2.23 cfs @ 11.95 hrs, Volume= 0.118 af Outflow = 1.91 cfs @ 12.07 hrs, Volume= 0.118 af, Atten= 14%, Lag= 7.1 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.86 fps, Min. Travel Time= 4.9 min Avg. Velocity = 0.18 fps, Avg. Travel Time= 23.0 min Peak Storage= 564 cf @ 11.99 hrs Average Depth at Peak Storage= 0.42' Bank-Full Depth= 1.00' Flow Area= 7.0 sf, Capacity= 9.60 cfs 4.00' x 1.00' deep channel, n= 0.150 Side Slope Z-value= 3.0 '/' Top Width= 10.00' Length= 252.0' Slope= 0.0321 '/' Inlet Invert= 365.10', Outlet Invert= 357.00' ‡ Reach 192R: GC-A2 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)2 1 0 Inflow Area=1.200 ac Avg. Flow Depth=0.42' Max Vel=0.86 fps n=0.150 L=252.0' S=0.0321 '/' Capacity=9.60 cfs 2.23 cfs 1.91 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 19HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Reach 193R: GC-A3 Inflow Area = 0.650 ac, Inflow Depth = 3.18" for 100 Year event Inflow = 3.53 cfs @ 11.91 hrs, Volume= 0.172 af Outflow = 2.22 cfs @ 12.15 hrs, Volume= 0.172 af, Atten= 37%, Lag= 14.6 min Routing by Stor-Ind+Trans method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Max. Velocity= 0.75 fps, Min. Travel Time= 11.6 min Avg. Velocity = 0.15 fps, Avg. Travel Time= 56.3 min Peak Storage= 1,549 cf @ 11.96 hrs Average Depth at Peak Storage= 0.61' Bank-Full Depth= 1.00' Flow Area= 6.0 sf, Capacity= 5.84 cfs 3.00' x 1.00' deep channel, n= 0.125 Side Slope Z-value= 3.0 '/' Top Width= 9.00' Length= 520.0' Slope= 0.0121 '/' Inlet Invert= 342.67', Outlet Invert= 336.40' ‡ Reach 193R: GC-A3 Inflow Outflow Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)3 2 1 0 Inflow Area=0.650 ac Avg. Flow Depth=0.61' Max Vel=0.75 fps n=0.125 L=520.0' S=0.0121 '/' Capacity=5.84 cfs 3.53 cfs 2.22 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 20HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 194P: Pond A Inflow Area = 24.150 ac, Inflow Depth = 2.53" for 100 Year event Inflow = 86.02 cfs @ 11.98 hrs, Volume= 5.098 af Outflow = 15.95 cfs @ 12.26 hrs, Volume= 5.098 af, Atten= 81%, Lag= 16.9 min Primary = 15.95 cfs @ 12.26 hrs, Volume= 5.098 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 331.25' Surf.Area= 13,348 sf Storage= 23,564 cf Peak Elev= 336.19' @ 12.26 hrs Surf.Area= 23,597 sf Storage= 113,311 cf (89,747 cf above start) Plug-Flow detention time= 213.9 min calculated for 4.557 af (89% of inflow) Center-of-Mass det. time= 117.4 min ( 900.8 - 783.4 ) Volume Invert Avail.Storage Storage Description #1 327.25' 120,624 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 327.25 37 0 0 327.75 2,014 513 513 328.00 2,516 566 1,079 329.00 4,793 3,655 4,734 330.00 6,677 5,735 10,469 331.00 12,941 9,809 20,278 332.00 14,567 13,754 34,032 333.00 16,466 15,517 49,548 334.00 18,587 17,527 67,075 335.00 20,824 19,706 86,780 336.00 23,135 21,980 108,760 336.50 24,321 11,864 120,624 Device Routing Invert Outlet Devices #1 Primary 331.15'15.0" Round Culvert L= 20.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 331.15' / 331.00' S= 0.0075 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.23 sf #2 Device 1 331.25'12.0" Vert. Orifice/Grate C= 0.600 #3 Device 1 332.75'48.0" W x 12.0" H Vert. Orifice/Grate C= 0.600 #4 Primary 335.75'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Primary OutFlow Max=15.91 cfs @ 12.26 hrs HW=336.19' (Free Discharge) 1=Culvert (Inlet Controls 9.81 cfs @ 7.99 fps) 2=Orifice/Grate (Passes < 7.97 cfs potential flow) 3=Orifice/Grate (Passes < 33.01 cfs potential flow) 4=Broad-Crested Rectangular Weir (Weir Controls 6.11 cfs @ 1.72 fps) Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 21HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 194P: Pond A Inflow Primary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Inflow Area=24.150 ac Peak Elev=336.19' Storage=113,311 cf 86.02 cfs 15.95 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 22HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 195P: Infiltration A Inflow Area = 24.150 ac, Inflow Depth = 2.53" for 100 Year event Inflow = 15.95 cfs @ 12.26 hrs, Volume= 5.098 af Outflow = 8.79 cfs @ 13.55 hrs, Volume= 5.098 af, Atten= 45%, Lag= 77.4 min Discarded = 6.51 cfs @ 11.90 hrs, Volume= 4.630 af Primary = 2.28 cfs @ 13.55 hrs, Volume= 0.468 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 333.40' @ 13.55 hrs Surf.Area= 10,348 sf Storage= 20,814 cf Plug-Flow detention time= 22.4 min calculated for 5.097 af (100% of inflow) Center-of-Mass det. time= 22.3 min ( 923.1 - 900.8 ) Volume Invert Avail.Storage Storage Description #1 331.00' 27,230 cf Custom Stage Data (Prismatic) Listed below (Recalc) Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 331.00 7,013 0 0 332.00 8,357 7,685 7,685 333.00 9,758 9,058 16,743 334.00 11,216 10,487 27,230 Device Routing Invert Outlet Devices #1 Discarded 331.00'40.000 in/hr Exfiltration over Surface area below 331.01' #2 Primary 331.75'6.0" Vert. Orifice/Grate C= 0.600 #3 Primary 333.25'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Discarded OutFlow Max=6.51 cfs @ 11.90 hrs HW=331.03' (Free Discharge) 1=Exfiltration (Exfiltration Controls 6.51 cfs) Primary OutFlow Max=2.28 cfs @ 13.55 hrs HW=333.40' (Free Discharge) 2=Orifice/Grate (Orifice Controls 1.12 cfs @ 5.71 fps) 3=Broad-Crested Rectangular Weir (Weir Controls 1.16 cfs @ 0.94 fps) Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 23HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 195P: Infiltration A Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=24.150 ac Peak Elev=333.40' Storage=20,814 cf 15.95 cfs 8.79 cfs 6.51 cfs 2.28 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 24HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 196P: Infiltration Trench63 Inflow Area = 0.170 ac, Inflow Depth = 3.83" for 100 Year event Inflow = 1.12 cfs @ 11.91 hrs, Volume= 0.054 af Outflow = 1.12 cfs @ 11.91 hrs, Volume= 0.054 af, Atten= 1%, Lag= 0.1 min Discarded = 0.06 cfs @ 11.21 hrs, Volume= 0.036 af Primary = 1.06 cfs @ 11.91 hrs, Volume= 0.018 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 348.58' @ 11.91 hrs Surf.Area= 102 sf Storage= 125 cf Plug-Flow detention time= 5.6 min calculated for 0.054 af (100% of inflow) Center-of-Mass det. time= 5.6 min ( 747.6 - 742.0 ) Volume Invert Avail.Storage Storage Description #1 352.80' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 346.18' 72 cf 3.25'W x 31.50'L x 2.42'H Field A 248 cf Overall - 67 cf Embedded = 181 cf x 40.0% Voids #3A 346.51' 54 cf ADS N-12 18 x 2 Inside #2 Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= -10.00' x 1.80 sf x 1 rows 156 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 352.80 20 0 0 353.30 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 346.18'25.000 in/hr Exfiltration over Surface area below 346.19' #2 Primary 348.09'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.06 cfs @ 11.21 hrs HW=346.25' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.06 cfs) Primary OutFlow Max=1.05 cfs @ 11.91 hrs HW=348.58' (Free Discharge) 2=Orifice/Grate (Orifice Controls 1.05 cfs @ 2.37 fps) Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 25HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 196P: Infiltration Trench63 - Chamber Wizard Field A Chamber Model = ADS N-12 18 (ADS N-12® Pipe) Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= -10.00' x 1.80 sf x 1 rows 2 Chambers/Row x 20.00' Long -10.00' Row Adjustment = 30.00' Row Length +9.0" End Stone x 2 = 31.50' Base Length 1 Rows x 21.0" Wide + 9.0" Side Stone x 2 = 3.25' Base Width 4.0" Base + 21.0" Chamber Height + 4.0" Cover = 2.42' Field Height 2 Chambers x 36.0 cf -10.00' Row Adjustment x 1.80 sf x 1 Rows = 54.0 cf Chamber Storage 2 Chambers x 44.5 cf -10.00' Row Adjustment x 2.23 sf x 1 Rows = 66.8 cf Displacement 247.5 cf Field - 66.8 cf Chambers = 180.7 cf Stone x 40.0% Voids = 72.3 cf Stone Storage Chamber Storage + Stone Storage = 126.3 cf = 0.003 af Overall Storage Efficiency = 51.0% 2 Chambers 9.2 cy Field 6.7 cy Stone Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 26HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 196P: Infiltration Trench63 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Inflow Area=0.170 ac Peak Elev=348.58' Storage=125 cf 1.12 cfs1.12 cfs 0.06 cfs 1.06 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 27HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 197P: Infiltration Trench65 Inflow Area = 0.100 ac, Inflow Depth = 3.72" for 100 Year event Inflow = 0.64 cfs @ 11.91 hrs, Volume= 0.031 af Outflow = 0.64 cfs @ 11.91 hrs, Volume= 0.031 af, Atten= 1%, Lag= 0.2 min Discarded = 0.04 cfs @ 11.48 hrs, Volume= 0.022 af Primary = 0.59 cfs @ 11.91 hrs, Volume= 0.009 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Peak Elev= 335.71' @ 11.91 hrs Surf.Area= 76 sf Storage= 87 cf Plug-Flow detention time= 5.4 min calculated for 0.031 af (100% of inflow) Center-of-Mass det. time= 5.4 min ( 747.8 - 742.4 ) Volume Invert Avail.Storage Storage Description #1 339.60' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 333.52' 54 cf 3.25'W x 23.50'L x 2.42'H Field A 185 cf Overall - 49 cf Embedded = 136 cf x 40.0% Voids #3A 333.85' 40 cf ADS N-12 18 Inside #2 Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= +2.00' x 1.80 sf x 1 rows 124 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 339.60 20 0 0 340.10 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 333.52'25.000 in/hr Exfiltration over Surface area below 333.53' #2 Primary 335.35'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.04 cfs @ 11.48 hrs HW=333.59' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.59 cfs @ 11.91 hrs HW=335.71' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.59 cfs @ 2.03 fps) Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 28HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 197P: Infiltration Trench65 - Chamber Wizard Field A Chamber Model = ADS N-12 18 (ADS N-12® Pipe) Inside= 18.2"W x 18.2"H => 1.80 sf x 20.00'L = 36.0 cf Outside= 21.0"W x 21.0"H => 2.23 sf x 20.00'L = 44.5 cf Row Length Adjustment= +2.00' x 1.80 sf x 1 rows 1 Chambers/Row x 20.00' Long +2.00' Row Adjustment = 22.00' Row Length +9.0" End Stone x 2 = 23.50' Base Length 1 Rows x 21.0" Wide + 9.0" Side Stone x 2 = 3.25' Base Width 4.0" Base + 21.0" Chamber Height + 4.0" Cover = 2.42' Field Height 1 Chambers x 36.0 cf +2.00' Row Adjustment x 1.80 sf x 1 Rows = 39.6 cf Chamber Storage 1 Chambers x 44.5 cf +2.00' Row Adjustment x 2.23 sf x 1 Rows = 49.0 cf Displacement 184.6 cf Field - 49.0 cf Chambers = 135.7 cf Stone x 40.0% Voids = 54.3 cf Stone Storage Chamber Storage + Stone Storage = 93.9 cf = 0.002 af Overall Storage Efficiency = 50.8% 1 Chambers 6.8 cy Field 5.0 cy Stone Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 29HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 197P: Infiltration Trench65 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.100 ac Peak Elev=335.71' Storage=87 cf 0.64 cfs0.64 cfs 0.04 cfs 0.59 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 30HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 198P: Infiltration Trench67 Inflow Area = 0.170 ac, Inflow Depth = 3.83" for 100 Year event Inflow = 1.12 cfs @ 11.91 hrs, Volume= 0.054 af Outflow = 1.28 cfs @ 11.91 hrs, Volume= 0.054 af, Atten= 0%, Lag= 0.0 min Discarded = 0.06 cfs @ 11.26 hrs, Volume= 0.036 af Primary = 1.22 cfs @ 11.91 hrs, Volume= 0.018 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 3 Peak Elev= 329.36' @ 11.91 hrs Surf.Area= 103 sf Storage= 109 cf Plug-Flow detention time= 8.2 min calculated for 0.054 af (100% of inflow) Center-of-Mass det. time= 7.0 min ( 749.0 - 742.0 ) Volume Invert Avail.Storage Storage Description #1 333.27' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 27.52' 67 cf 2.83'W x 36.33'L x 2.17'H Field A 223 cf Overall - 56 cf Embedded = 167 cf x 40.0% Voids #3A 27.85' 42 cf ADS N-12 15 x 2 Inside #2 Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= -5.00' x 1.20 sf x 1 rows 139 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 333.27 20 0 0 333.77 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 27.52'25.000 in/hr Exfiltration over Surface area below 327.53' #2 Primary 329.02'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.06 cfs @ 11.26 hrs HW=27.86' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.06 cfs) Primary OutFlow Max=0.53 cfs @ 11.91 hrs HW=329.36' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.53 cfs @ 1.98 fps) Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 31HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 198P: Infiltration Trench67 - Chamber Wizard Field A Chamber Model = ADS N-12 15 (ADS N-12® Pipe) Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= -5.00' x 1.20 sf x 1 rows 2 Chambers/Row x 20.00' Long -5.00' Row Adjustment = 35.00' Row Length +8.0" End Stone x 2 = 36.33' Base Length 1 Rows x 18.0" Wide + 8.0" Side Stone x 2 = 2.83' Base Width 4.0" Base + 18.0" Chamber Height + 4.0" Cover = 2.17' Field Height 2 Chambers x 24.0 cf -5.00' Row Adjustment x 1.20 sf x 1 Rows = 42.0 cf Chamber Storage 2 Chambers x 31.9 cf -5.00' Row Adjustment x 1.60 sf x 1 Rows = 55.9 cf Displacement 222.9 cf Field - 55.9 cf Chambers = 167.1 cf Stone x 40.0% Voids = 66.8 cf Stone Storage Chamber Storage + Stone Storage = 108.8 cf = 0.002 af Overall Storage Efficiency = 48.8% 2 Chambers 8.3 cy Field 6.2 cy Stone Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 32HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 198P: Infiltration Trench67 Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Inflow Area=0.170 ac Peak Elev=329.36' Storage=109 cf 1.12 cfs 1.28 cfs 0.06 cfs 1.22 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 33HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 199P: Infiltration Trench65A Inflow Area = 0.110 ac, Inflow Depth = 3.81" for 100 Year event Inflow = 0.72 cfs @ 11.91 hrs, Volume= 0.035 af Outflow = 0.72 cfs @ 11.91 hrs, Volume= 0.035 af, Atten= 1%, Lag= 0.1 min Discarded = 0.04 cfs @ 11.21 hrs, Volume= 0.023 af Primary = 0.68 cfs @ 11.91 hrs, Volume= 0.012 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs / 2 Peak Elev= 341.99' @ 11.91 hrs Surf.Area= 66 sf Storage= 64 cf Plug-Flow detention time= 4.2 min calculated for 0.035 af (100% of inflow) Center-of-Mass det. time= 4.3 min ( 746.4 - 742.1 ) Volume Invert Avail.Storage Storage Description #1 345.68' 30 cf Custom Stage Data (Prismatic) Listed below (Recalc) #2A 340.02' 43 cf 2.83'W x 23.33'L x 2.17'H Field A 143 cf Overall - 35 cf Embedded = 108 cf x 40.0% Voids #3A 340.35' 26 cf ADS N-12 15 Inside #2 Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= +2.00' x 1.20 sf x 1 rows 100 cf Total Available Storage Storage Group A created with Chamber Wizard Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 345.68 20 0 0 346.18 100 30 30 Device Routing Invert Outlet Devices #1 Discarded 340.02'25.000 in/hr Exfiltration over Surface area below 340.03' #2 Primary 341.60'15.0" Vert. Orifice/Grate C= 0.600 Discarded OutFlow Max=0.04 cfs @ 11.21 hrs HW=340.08' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.04 cfs) Primary OutFlow Max=0.68 cfs @ 11.91 hrs HW=341.98' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.68 cfs @ 2.11 fps) Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 34HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 199P: Infiltration Trench65A - Chamber Wizard Field A Chamber Model = ADS N-12 15 (ADS N-12® Pipe) Inside= 14.8"W x 14.8"H => 1.20 sf x 20.00'L = 24.0 cf Outside= 18.0"W x 18.0"H => 1.60 sf x 20.00'L = 31.9 cf Row Length Adjustment= +2.00' x 1.20 sf x 1 rows 1 Chambers/Row x 20.00' Long +2.00' Row Adjustment = 22.00' Row Length +8.0" End Stone x 2 = 23.33' Base Length 1 Rows x 18.0" Wide + 8.0" Side Stone x 2 = 2.83' Base Width 4.0" Base + 18.0" Chamber Height + 4.0" Cover = 2.17' Field Height 1 Chambers x 24.0 cf +2.00' Row Adjustment x 1.20 sf x 1 Rows = 26.4 cf Chamber Storage 1 Chambers x 31.9 cf +2.00' Row Adjustment x 1.60 sf x 1 Rows = 35.1 cf Displacement 143.2 cf Field - 35.1 cf Chambers = 108.1 cf Stone x 40.0% Voids = 43.2 cf Stone Storage Chamber Storage + Stone Storage = 69.6 cf = 0.002 af Overall Storage Efficiency = 48.6% 1 Chambers 5.3 cy Field 4.0 cy Stone Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 35HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Pond 199P: Infiltration Trench65A Inflow Outflow DiscardedPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Inflow Area=0.110 ac Peak Elev=341.99' Storage=64 cf 0.72 cfs0.72 cfs 0.04 cfs 0.68 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 36HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 200P: GravelWet1 Inflow Area = 2.610 ac, Inflow Depth = 2.82" for 100 Year event Inflow = 14.23 cfs @ 11.95 hrs, Volume= 0.613 af Outflow = 4.81 cfs @ 12.06 hrs, Volume= 0.613 af, Atten= 66%, Lag= 6.9 min Primary = 4.81 cfs @ 12.06 hrs, Volume= 0.613 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 326.17' Surf.Area= 4,400 sf Storage= 2,125 cf Peak Elev= 329.01' @ 12.06 hrs Surf.Area= 11,277 sf Storage= 15,179 cf (13,053 cf above start) Plug-Flow detention time= 710.3 min calculated for 0.564 af (92% of inflow) Center-of-Mass det. time= 605.3 min ( 1,401.6 - 796.3 ) Volume Invert Avail.Storage Storage Description #1 323.50' 2,050 cf Custom Stage Data (Prismatic) Listed below (Recalc) 5,126 cf Overall x 40.0% Voids #2 325.83' 147 cf Custom Stage Data (Prismatic) Listed below (Recalc) 1,474 cf Overall x 10.0% Voids #3 326.50' 20,418 cf Custom Stage Data (Prismatic) Listed below (Recalc) 22,616 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 323.50 2,200 0 0 325.83 2,200 5,126 5,126 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 325.83 2,200 0 0 326.50 2,200 1,474 1,474 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 326.50 2,200 0 0 327.00 4,413 1,653 1,653 328.00 5,610 5,012 6,665 329.00 6,862 6,236 12,901 330.00 8,172 7,517 20,418 Device Routing Invert Outlet Devices #1 Primary 326.17'18.0" Round Culvert L= 75.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 326.17' / 325.80' S= 0.0049 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Device 1 326.17'1.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 327.30'1.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 328.50'48.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 37HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Primary OutFlow Max=4.81 cfs @ 12.06 hrs HW=329.01' (Free Discharge) 1=Culvert (Passes 4.81 cfs of 9.71 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.10 cfs @ 8.03 fps) 3=Orifice/Grate (Orifice Controls 0.03 cfs @ 6.22 fps) 4=Orifice/Grate (Orifice Controls 4.68 cfs @ 2.34 fps) Pond 200P: GravelWet1 Inflow Primary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=2.610 ac Peak Elev=329.01' Storage=15,179 cf 14.23 cfs 4.81 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 38HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Pond 201P: GravelWet2 Inflow Area = 7.060 ac, Inflow Depth = 3.13" for 100 Year event Inflow = 39.17 cfs @ 11.97 hrs, Volume= 1.844 af Outflow = 10.23 cfs @ 12.10 hrs, Volume= 1.844 af, Atten= 74%, Lag= 7.8 min Primary = 10.23 cfs @ 12.10 hrs, Volume= 1.844 af Routing by Stor-Ind method, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Starting Elev= 330.67' Surf.Area= 15,488 sf Storage= 7,481 cf Peak Elev= 334.08' @ 12.10 hrs Surf.Area= 31,324 sf Storage= 45,730 cf (38,250 cf above start) Plug-Flow detention time= 686.4 min calculated for 1.672 af (91% of inflow) Center-of-Mass det. time= 568.1 min ( 1,376.4 - 808.2 ) Volume Invert Avail.Storage Storage Description #1 328.00' 7,217 cf Custom Stage Data (Prismatic) Listed below (Recalc) 18,044 cf Overall x 40.0% Voids #2 330.33' 519 cf Custom Stage Data (Prismatic) Listed below (Recalc) 5,188 cf Overall x 10.0% Voids #3 331.00' 44,909 cf Custom Stage Data (Prismatic) Listed below (Recalc) 52,645 cf Total Available Storage Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 328.00 7,744 0 0 330.33 7,744 18,044 18,044 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 330.33 7,744 0 0 331.00 7,744 5,188 5,188 Elevation Surf.Area Inc.Store Cum.Store (feet) (sq-ft) (cubic-feet) (cubic-feet) 331.00 7,744 0 0 332.00 11,537 9,641 9,641 333.00 13,558 12,548 22,188 334.00 15,674 14,616 36,804 334.50 16,744 8,105 44,909 Device Routing Invert Outlet Devices #1 Primary 330.67'18.0" Round Culvert L= 15.0' CPP, projecting, no headwall, Ke= 0.900 Inlet / Outlet Invert= 330.67' / 329.00' S= 0.1113 '/' Cc= 0.900 n= 0.013 Corrugated PE, smooth interior, Flow Area= 1.77 sf #2 Device 1 330.67'2.5" Vert. Orifice/Grate C= 0.600 #3 Device 1 332.00'1.0" Vert. Orifice/Grate C= 0.600 #4 Device 1 333.00'6.0" Vert. Orifice/Grate C= 0.600 #5 Device 1 333.50'48.0" W x 6.0" H Vert. Orifice/Grate C= 0.600 #6 Primary 333.75'8.0' long x 4.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 39HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC 2.50 3.00 3.50 4.00 4.50 5.00 5.50 Coef. (English) 2.38 2.54 2.69 2.68 2.67 2.67 2.65 2.66 2.66 2.68 2.72 2.73 2.76 2.79 2.88 3.07 3.32 Primary OutFlow Max=10.21 cfs @ 12.10 hrs HW=334.08' (Free Discharge) 1=Culvert (Passes 6.53 cfs of 10.95 cfs potential flow) 2=Orifice/Grate (Orifice Controls 0.30 cfs @ 8.75 fps) 3=Orifice/Grate (Orifice Controls 0.04 cfs @ 6.87 fps) 4=Orifice/Grate (Orifice Controls 0.86 cfs @ 4.37 fps) 5=Orifice/Grate (Orifice Controls 5.34 cfs @ 2.67 fps) 6=Broad-Crested Rectangular Weir (Weir Controls 3.68 cfs @ 1.41 fps) Pond 201P: GravelWet2 InflowPrimary Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Inflow Area=7.060 ac Peak Elev=334.08' Storage=45,730 cf 39.17 cfs 10.23 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 40HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 202L: Study2 Inflow Area = 33.820 ac, Inflow Depth = 1.04" for 100 Year event Inflow = 14.90 cfs @ 12.09 hrs, Volume= 2.924 af Primary = 14.90 cfs @ 12.09 hrs, Volume= 2.924 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 202L: Study2 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=33.820 ac 14.90 cfs14.90 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 41HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 203L: SN4 Inflow Area = 33.820 ac, Inflow Depth = 1.04" for 100 Year event Inflow = 14.90 cfs @ 12.09 hrs, Volume= 2.924 af Primary = 14.90 cfs @ 12.09 hrs, Volume= 2.924 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 203L: SN4 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 Inflow Area=33.820 ac 14.90 cfs14.90 cfs Qp100-No Routing 181S SWMA182S GCA1 183S GCA2 184S GCA3 185S CB63/64 186S CB65/66 187S CB66/67 188S CB65A/66A 205S SWMB 206S SWMC 202L Study2 203L SN4 Routing Diagram for Hillside2020-post-no-routingPrepared by Krebs & Lansing Consulting Engineers, Inc., Printed 9/15/2021 HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcat Reach Pond Link Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 2HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Project Notes Hillside @ O'Brien Farm Eldredge Street, Kennedy Drive, Old Farm Road South Burlington, Vermont Post Development Stormwater Model - No Routing Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 3HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Area Listing (selected nodes) Area (acres) CN Description (subcatchment-numbers) 6.330 39 >75% Grass cover, Good, HSG A (181S, 182S, 183S, 184S, 185S, 186S, 187S, 188S) 0.370 61 >75% Grass cover, Good, HSG B (181S) 3.520 74 >75% Grass cover, Good, HSG C (181S) 4.160 80 >75% Grass cover, Good, HSG D (181S, 182S, 183S) 4.670 98 Paved parking, HSG A (181S, 185S, 186S, 187S, 188S) 3.810 98 Roofs, HSG A (181S, 182S, 183S, 184S) 0.200 98 Water Surface, 0% imp, HSG A (181S) 0.730 30 Woods, Good, HSG A (181S, 182S, 183S) 0.910 77 Woods, Good, HSG D (181S, 182S, 183S) 2.060 85 Workbook (205S) 7.060 84 Workbook (206S) 33.820 76 TOTAL AREA Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 4HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Time span=0.00-128.00 hrs, dt=0.01 hrs, 12801 points Runoff by SCS TR-20 method, UH=SCS, Weighted-Q Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Runoff Area=20.360 ac Runoff Depth=2.64"Subcatchment 181S: SWMA Flow Length=1,465' Tc=6.8 min CN=74 Runoff=82.01 cfs 4.474 af Runoff Area=1.940 ac Runoff Depth=2.06"Subcatchment 182S: GCA1 Flow Length=168' Tc=4.5 min CN=67 Runoff=6.99 cfs 0.334 af Runoff Area=1.200 ac Runoff Depth=1.18"Subcatchment 183S: GCA2 Flow Length=138' Tc=4.5 min CN=51 Runoff=2.23 cfs 0.118 af Runoff Area=0.650 ac Runoff Depth=3.18"Subcatchment 184S: GCA3 Tc=1.0 min CN=79 Runoff=3.53 cfs 0.172 af Runoff Area=0.170 ac Runoff Depth=3.83"Subcatchment 185S: CB63/64 Tc=1.0 min CN=88 Runoff=1.12 cfs 0.054 af Runoff Area=0.100 ac Runoff Depth=3.72"Subcatchment 186S: CB65/66 Tc=1.0 min CN=86 Runoff=0.64 cfs 0.031 af Runoff Area=0.170 ac Runoff Depth=3.83"Subcatchment 187S: CB66/67 Tc=1.0 min CN=88 Runoff=1.12 cfs 0.054 af Runoff Area=0.110 ac Runoff Depth=3.81"Subcatchment 188S: CB65A/66A Tc=1.0 min CN=87 Runoff=0.72 cfs 0.035 af Runoff Area=2.060 ac Runoff Depth=3.23"Subcatchment 205S: SWMB Tc=5.3 min CN=85 Runoff=11.79 cfs 0.554 af Runoff Area=7.060 ac Runoff Depth=3.13"Subcatchment 206S: SWMC Tc=5.5 min CN=84 Runoff=39.17 cfs 1.844 af Inflow=143.23 cfs 7.498 afLink 202L: Study2 Primary=143.23 cfs 7.498 af Inflow=143.23 cfs 7.498 afLink 203L: SN4 Primary=143.23 cfs 7.498 af Total Runoff Area = 33.820 ac Runoff Volume = 7.670 af Average Runoff Depth = 2.72" Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 5HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 181S: SWMA Runoff = 82.01 cfs @ 11.98 hrs, Volume= 4.474 af, Depth= 2.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 2.880 98 Roofs, HSG A 4.220 98 Paved parking, HSG A 0.200 98 Water Surface, 0% imp, HSG A 5.250 39 >75% Grass cover, Good, HSG A 0.370 61 >75% Grass cover, Good, HSG B 3.520 74 >75% Grass cover, Good, HSG C 3.770 80 >75% Grass cover, Good, HSG D 0.020 30 Woods, Good, HSG A 0.130 77 Woods, Good, HSG D 20.360 74 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.2 20 0.0500 0.10 Sheet Flow, yard Grass: Dense n= 0.240 P2= 2.30" 1.8 220 0.0160 2.04 Shallow Concentrated Flow, swale Unpaved Kv= 16.1 fps 1.8 1,225 0.0450 11.17 13.70 Pipe Channel, Piped 15.0" Round Area= 1.2 sf Perim= 3.9' r= 0.31' n= 0.013 Corrugated PE, smooth interior 6.8 1,465 Total Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 6HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Subcatchment 181S: SWMA Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=20.360 ac Runoff Volume=4.474 af Runoff Depth=2.64" Flow Length=1,465' Tc=6.8 min CN=74 82.01 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 7HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 182S: GCA1 Runoff = 6.99 cfs @ 11.95 hrs, Volume= 0.334 af, Depth= 2.06" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.290 98 Roofs, HSG A 0.320 30 Woods, Good, HSG A 0.680 77 Woods, Good, HSG D 0.320 39 >75% Grass cover, Good, HSG A 0.330 80 >75% Grass cover, Good, HSG D 1.940 67 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 140 0.2000 7.20 Shallow Concentrated Flow, shallow Unpaved Kv= 16.1 fps 4.5 168 Total Subcatchment 182S: GCA1 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)7 6 5 4 3 2 1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=1.940 ac Runoff Volume=0.334 af Runoff Depth=2.06" Flow Length=168' Tc=4.5 min CN=67 6.99 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 8HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 183S: GCA2 Runoff = 2.23 cfs @ 11.95 hrs, Volume= 0.118 af, Depth= 1.18" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.200 98 Roofs, HSG A 0.390 30 Woods, Good, HSG A 0.100 77 Woods, Good, HSG D 0.450 39 >75% Grass cover, Good, HSG A 0.060 80 >75% Grass cover, Good, HSG D 1.200 51 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 4.2 28 0.0500 0.11 Sheet Flow, sheet Grass: Dense n= 0.240 P2= 2.30" 0.3 110 0.1090 5.32 Shallow Concentrated Flow, Unpaved Kv= 16.1 fps 4.5 138 Total Subcatchment 183S: GCA2 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)2 1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=1.200 ac Runoff Volume=0.118 af Runoff Depth=1.18" Flow Length=138' Tc=4.5 min CN=51 2.23 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 9HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 184S: GCA3 Runoff = 3.53 cfs @ 11.91 hrs, Volume= 0.172 af, Depth= 3.18" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.440 98 Roofs, HSG A 0.210 39 >75% Grass cover, Good, HSG A 0.650 79 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Subcatchment 184S: GCA3 Runoff Hydrograph Time (hours)12512011511010510095908580757065605550454035302520151050Flow (cfs)3 2 1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=0.650 ac Runoff Volume=0.172 af Runoff Depth=3.18" Tc=1.0 min CN=79 3.53 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 10HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 185S: CB63/64 Undeveloped area draining to Pond 2 Runoff = 1.12 cfs @ 11.91 hrs, Volume= 0.054 af, Depth= 3.83" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 185S: CB63/64 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=0.170 ac Runoff Volume=0.054 af Runoff Depth=3.83" Tc=1.0 min CN=88 1.12 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 11HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 186S: CB65/66 Undeveloped area draining to Pond 2 Runoff = 0.64 cfs @ 11.91 hrs, Volume= 0.031 af, Depth= 3.72" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.080 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.100 86 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 186S: CB65/66 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=0.100 ac Runoff Volume=0.031 af Runoff Depth=3.72" Tc=1.0 min CN=86 0.64 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 12HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 187S: CB66/67 Undeveloped area draining to Pond 2 Runoff = 1.12 cfs @ 11.91 hrs, Volume= 0.054 af, Depth= 3.83" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.140 98 Paved parking, HSG A 0.030 39 >75% Grass cover, Good, HSG A 0.170 88 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 187S: CB66/67 Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=0.170 ac Runoff Volume=0.054 af Runoff Depth=3.83" Tc=1.0 min CN=88 1.12 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 13HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 188S: CB65A/66A Undeveloped area draining to Pond 2 Runoff = 0.72 cfs @ 11.91 hrs, Volume= 0.035 af, Depth= 3.81" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description 0.090 98 Paved parking, HSG A 0.020 39 >75% Grass cover, Good, HSG A 0.110 87 Weighted Average Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.0 Direct Entry, Min. Subcatchment 188S: CB65A/66A Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)0.8 0.75 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=0.110 ac Runoff Volume=0.035 af Runoff Depth=3.81" Tc=1.0 min CN=87 0.72 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 14HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 205S: SWMB Runoff = 11.79 cfs @ 11.96 hrs, Volume= 0.554 af, Depth= 3.23" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description * 2.060 85 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.3 Direct Entry, Workbook- Lag Subcatchment 205S: SWMB Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)13 12 11 10 9 8 7 6 5 4 3 2 1 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=2.060 ac Runoff Volume=0.554 af Runoff Depth=3.23" Tc=5.3 min CN=85 11.79 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 15HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Subcatchment 206S: SWMC Runoff = 39.17 cfs @ 11.97 hrs, Volume= 1.844 af, Depth= 3.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Type II 24-hr 100 Year Rainfall=4.85" Area (ac) CN Description * 7.060 84 Workbook Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.5 Direct Entry, Workbook-Lag Subcatchment 206S: SWMC Runoff Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 4 2 0 Type II 24-hr 100 Year Rainfall=4.85" Runoff Area=7.060 ac Runoff Volume=1.844 af Runoff Depth=3.13" Tc=5.5 min CN=84 39.17 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 16HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 202L: Study2 Inflow Area = 33.170 ac, Inflow Depth = 2.71" for 100 Year event Inflow = 143.23 cfs @ 11.97 hrs, Volume= 7.498 af Primary = 143.23 cfs @ 11.97 hrs, Volume= 7.498 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 202L: Study2 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 Inflow Area=33.170 ac 143.23 cfs143.23 cfs Type II 24-hr 100 Year Rainfall=4.85"Hillside2020-post-no-routing Printed 9/15/2021Prepared by Krebs & Lansing Consulting Engineers, Inc. Page 17HydroCAD® 10.00 s/n 06429 © 2013 HydroCAD Software Solutions LLC Summary for Link 203L: SN4 Inflow Area = 33.170 ac, Inflow Depth = 2.71" for 100 Year event Inflow = 143.23 cfs @ 11.97 hrs, Volume= 7.498 af Primary = 143.23 cfs @ 11.97 hrs, Volume= 7.498 af, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-128.00 hrs, dt= 0.01 hrs Link 203L: SN4 Inflow Primary Hydrograph Time (hours) 12512011511010510095908580757065605550454035302520151050Flow (cfs)160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 Inflow Area=33.170 ac 143.23 cfs143.23 cfs