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Home My WebLink AboutSD-23-11 - Supplemental - 1200 Dorset Street (16)1S PRE-development Routing Diagram for Heald Subdivision - Lot 6 Prepared by Civil Engineering Associates, Inc., Printed 8/29/2023 HydroCAD® 10.00-25 s/n 00787 © 2019 HydroCAD Software Solutions LLC Subcat Reach Pond Link Type II 24-hr 1-Year Rainfall=1.90"Heald Subdivision - Lot 6 Printed 8/29/2023Prepared by Civil Engineering Associates, Inc. Page 2HydroCAD® 10.00-25 s/n 00787 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE-development [49] Hint: Tc<2dt may require smaller dt Runoff = 1.01 cfs @ 11.95 hrs, Volume= 0.047 af, Depth= 0.64" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 1.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 1-Year Rainfall=1.90" Area (sf) CN Description 34,100 80 >75% Grass cover, Good, HSG D * 4,500 98 Non Permit Ex. Impervious 38,600 Weighted Average 34,100 88.34% Pervious Area 4,500 11.66% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.7 200 0.0500 0.91 Lag/CN Method, Subcatchment 1S: PRE-development Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)1 0 Type II 24-hr 1-Year Rainfall=1.90" Runoff Area=38,600 sf Runoff Volume=0.047 af Runoff Depth=0.64" Flow Length=200' Slope=0.0500 '/' Tc=3.7 min CN=WQ 1.01 cfs Type II 24-hr 25-Year Rainfall=3.87"Heald Subdivision - Lot 6 Printed 8/29/2023Prepared by Civil Engineering Associates, Inc. Page 3HydroCAD® 10.00-25 s/n 00787 © 2019 HydroCAD Software Solutions LLC Summary for Subcatchment 1S: PRE-development [49] Hint: Tc<2dt may require smaller dt Runoff = 3.47 cfs @ 11.94 hrs, Volume= 0.158 af, Depth= 2.13" Runoff by SCS TR-20 method, UH=SCS, Weighted-Q, Time Span= 1.00-48.00 hrs, dt= 0.05 hrs Type II 24-hr 25-Year Rainfall=3.87" Area (sf) CN Description 34,100 80 >75% Grass cover, Good, HSG D * 4,500 98 Non Permit Ex. Impervious 38,600 Weighted Average 34,100 88.34% Pervious Area 4,500 11.66% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.7 200 0.0500 0.91 Lag/CN Method, Subcatchment 1S: PRE-development Runoff Hydrograph Time (hours) 48464442403836343230282624222018161412108642Flow (cfs)3 2 1 0 Type II 24-hr 25-Year Rainfall=3.87" Runoff Area=38,600 sf Runoff Volume=0.158 af Runoff Depth=2.13" Flow Length=200' Slope=0.0500 '/' Tc=3.7 min CN=WQ 3.47 cfs