HomeMy WebLinkAboutSP-24-08 - Supplemental - 0870 Williston Road (37)Version: 1/29/2018
Treatment Wetlands (4.3.5)
1
2
3
4
5
6
* Questions preceded by an asterix (*) may change based on previously entered values
7
8
9
10
11*
12*
13*
14
15
16
17
18
19*
20*
21
22
23
24
25
26
27
28
29
30
Attachment location: Indicate the specific location (i.e. appendix, page, plan sheet) where the requisite support documentation has been provided within the application.
Practice Drainage Area
New Impervious (acres)
Redeveloped Impervious
Practice Type
Discharges to Cold or Warm Water Fishery?
Note: Designers may use the Practice Drainage Area Runoff Calculator (second tab) for calculation of practice-specific runoff volumes for other treatment standards.
Conveyance (4.3.5.2)
Are inlets stabilized to ensure that non-erosive conditions exist for at least the 1-year, 24 hour storm?
Has a low for orifice been provided to meet the the WQV and CPV extended detention requirements and designed to ensure no clogging will occur?
Have the outfalls and the conveyance to the discharge point been designed and protected to avoid erosion?
Has a liner designed in accordance with Section 4.3.5.2 been provided if the infiltration rate exceed 0.05 inches per hour and the wetland is located above the average groundwater table?
Have inlet pipes been set at the permanent pool or the base of the gravel bed?
Is outlet elevation designed such that a sub-surface water level is maintained in the gravel wetland?
If the gravel wetland is designed with an organic soil layer at the surface, have vertical perforated riser pipes been provided to deliver stormwater stormwater from the surface down
to the gravel bed?
Pre-Treatment (4.3.6.3)
Has pretreatment been provided for non-rooftop runoff?
What type of pretreatment is being used?
Treatment (4.3.6.4)
What is the volume stored in the forebay or other volumetric pre-treatment if used? (minimum 10% WQV)
What is the volume stored in the permanent pool?
What is the total WQV stored at the normal water level (pre-treatment + permanent pool)?
Does the pre-treatment volume plus the permanent pool equal at least 50% of the WQV?
Is the remaining WQV provided for by extended detention over 24 hours?
Has a minimum flow path at normal water level of 3:1 been provided?
What is the Storage Volume of the practice. Include the permanent pool and any volume used for providing extended detention.
Landscaping (4.3.6.5)
Are all deep pool areas of ≥ 4 feet depth with side slopes steeper than 4:1 (H:V) surrounded by a safety bench with ≤6% slope extending 10 feet outward from the normal water edge to
the toe of the side slope?
Has an aquatic been been provided that extends at least 5 feet inward from the normal water edge and is no more than 18 inches deep?
Has a planting plan been prepared showing how aquatic and terrestrial areas will be stabilized, including plant species, plant locations, sources of plant material and any required soil
amendments?
Has a setback been provided that extends 25 feet from the maximum design water surface elevation of the practice?
Does the planting plan specify that no woody vegetation >2 inches in diameter shall be planted or allowed to grow on the dam, within 15 feet of the dam or the toe of the embankment,
or within 25 of a principal spillway outlet?
Are any donor organic soils used in the practice obtained from a source other than natural wetlands?
Total Area (acres)
WQV to practice
For Permit Coverage
13.9123908218549
1.42736328512397
8.54555926538108
WQV for credit
0.511564746718128
↑Enter this value on the Standards Compliance Workbook
Not for Permit Coverage
0
0
0
WQV not for credit
0
2
Total to Practice
13.9123908218549
1.42736328512397
8.54555926538108
Total WQV
0.511564746718128
2
Project Name:
Discharge Point:
Treatment Wetland #
Modified CN for WQ (1.0") storm
ft3
ft3
ft3
ac-ft
DoubleTree & Catamount Woods
1
1
Response
Response
Response
0
11989
11989
0.538015119644352
1.23
Response
92.8173018766671
Attachment location
No direct pipe inlets
Modeling
Plans
Plans
N/A
Plans
Plans
Attachment location
Plans
Attachment location
N/A
Modeling
Yes
Modeling
Plans
Enter this on the eNOI
Attachment location
No deep pools
N/A
Plans
N/A
Plans
Practice Drainage Area Runoff Calculator
This tool may be used to calculate the required treatment volumes for the area draining to an individual practice where the practices drainage area is only a portion of of the area draining
to a discharge point. Where the practice receives runoff from the entire area to a discharge point, this calculator will give the same information as the Standards Compliance Workbook.
Precipitation Data
Storm
Precipitation (inches)
Drainage Area Information
Pre Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
Post Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
TV of upstream practices:
Treatment Standard
Channel Protection (Hydrologic Condition Method)
Overbank Flood
Extreme Flood
Information for Calculating TC by the Watershed Lag Method
Pre Development
Post Development, upstream of practice
Post Development, with TV credit from practice
* Preciptation values shall be obtained from
WQ Storm
1
Hydrologic Soil Group
A
0
0
0
0
0
Hydrologic Soil Group
A
1.96844934113866
0
0
3.65542956382002
5.62387890495868
0
Required Treatment Volume
1.43006621899151
2.66135090129748
4.19407065870067
Average Catchment Slope, Y (%)
0.0765
0.0765
0
1 yr, 24 hr
1.87
B
0
0
0
0
0
B
0.18314822543618
0
0
1.05950447658402
1.2426527020202
ac-ft
Post Development Runoff Volume
1.43006621899151
2.66135090129748
4.19407065870067
Hydraulic Length, l (ft)
915
575
10 yr, 24 hr
3.2
C
0
0
0
0
0
C
0.736161724058769
0
0
3.57051078282828
4.30667250688705
Pre-development Runoff Volume
0
0
0
Time of Concentration, TC (min)
1 yr
0
4.44617521855735
0
Project Name:
Discharge Point:
Treatment Wetland #
NOAA Atlas 14
100 yr, 24 hr
4.78
D
0
0
0
0
0
D
1.03795491505969
0
0
1.70123180211203
2.73918671717172
TV credit of this practice:
Post Composite CN (to practice)
93.4812600526039
91.4070250234256
89.5456425183993
10 yr
0
4.88228827895215
0
DoubleTree & Catamount Woods
1
1
Total (acres)
0
0
0
0
0
Total (acres)
3.9257142056933
0
0
9.98667662534435
13.9123908310376
0
CNAdj (with TV practice credit)
93.4812600526039
91.4070250234256
89.5456425183993
100 yr
0
5.2761826739282
0
ac-ft
Pre Composite CN
0
0
0
Practice Drainage Area Runoff Calculator
This tool may be used to calculate the required treatment volumes for the area draining to an individual practice where the practices drainage area is only a portion of of the area draining
to a discharge point. Where the practice receives runoff from the entire area to a discharge point, this calculator will give the same information as the Standards Compliance Workbook.
Precipitation Data
Storm
Precipitation (inches)
Drainage Area Information
Pre Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
Post Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
TV of upstream practices:
Treatment Standard
Channel Protection (Hydrologic Condition Method)
Overbank Flood
Extreme Flood
Information for Calculating TC by the Watershed Lag Method
Pre Development
Post Development, upstream of practice
Post Development, with TV credit from practice
* Preciptation values shall be obtained from
WQ Storm
1
Hydrologic Soil Group
A
0
0
0
0
0
Hydrologic Soil Group
A
0
0
0
0
0
0
Required Treatment Volume
0.31388034807053
0.599086061799498
0.955880534659443
Average Catchment Slope, Y (%)
0.0765
0.0651
0
1 yr, 24 hr
1.87
B
0
0
0
0
0
B
0.133139129935721
0
0
0.335057291092746
0.468196421028466
ac-ft
Post Development Runoff Volume
0.31388034807053
0.599086061799498
0.955880534659443
Hydraulic Length, l (ft)
915
397
10 yr, 24 hr
3.2
C
0
0
0
0
0
C
0.335762559687787
0
0
1.10331776170799
1.43908032139578
Pre-development Runoff Volume
0
0
0
Time of Concentration, TC (min)
1 yr
0
3.47628111427668
0
Project Name:
Discharge Point:
Treatment Wetland #
NOAA Atlas 14
100 yr, 24 hr
4.78
D
0
0
0
0
0
D
0.336748014233241
0
0
0.687822268135905
1.02457028236915
TV credit of this practice:
Post Composite CN (to practice)
94.1162633194491
93.0648474562001
92.3534558269923
10 yr
0
3.65408972047494
0
DoubleTree & Catamount Woods
1
1
Total (acres)
0
0
0
0
0
Total (acres)
0.805649703856749
0
0
2.12619732093664
2.93184702479339
0
CNAdj (with TV practice credit)
94.1162633194491
93.0648474562001
92.3534558269923
100 yr
0
3.77455576716007
0
ac-ft
Pre Composite CN
0
0
0
Practice Drainage Area Runoff Calculator
This tool may be used to calculate the required treatment volumes for the area draining to an individual practice where the practices drainage area is only a portion of of the area draining
to a discharge point. Where the practice receives runoff from the entire area to a discharge point, this calculator will give the same information as the Standards Compliance Workbook.
Precipitation Data
Storm
Precipitation (inches)
Drainage Area Information
Pre Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
Post Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
TV of upstream practices:
Treatment Standard
Channel Protection (Hydrologic Condition Method)
Overbank Flood
Extreme Flood
Information for Calculating TC by the Watershed Lag Method
Pre Development
Post Development, upstream of practice
Post Development, with TV credit from practice
* Preciptation values shall be obtained from
WQ Storm
1
Hydrologic Soil Group
A
0
0
0
0
0
Hydrologic Soil Group
A
0
0
0
0
0
0
Required Treatment Volume
0.159681363017431
0.287953441788715
0.440886509423278
Average Catchment Slope, Y (%)
0.0765
0.01
0
1 yr, 24 hr
1.87
B
0
0
0
0
0
B
0
0
0
0.420189912764004
0.420189912764004
ac-ft
Post Development Runoff Volume
0.159681363017431
0.287953441788715
0.440886509423278
Hydraulic Length, l (ft)
915
194
10 yr, 24 hr
3.2
C
0
0
0
0
0
C
0
0
0
0.744244132231405
0.744244132231405
Pre-development Runoff Volume
0
0
0
Time of Concentration, TC (min)
1 yr
0
4.05458990847333
0
Project Name:
Discharge Point:
Treatment Wetland #
NOAA Atlas 14
100 yr, 24 hr
4.78
D
0
0
0
0
0
D
0
0
0
0
0
TV credit of this practice:
Post Composite CN (to practice)
98
97.9999999999999
97.9999999999999
10 yr
0
4.05458990847335
0
DoubleTree & Catamount Woods
1
1
Total (acres)
0
0
0
0
0
Total (acres)
0
0
0
1.16443404499541
1.16443404499541
0
CNAdj (with TV practice credit)
98
97.9999999999999
97.9999999999999
100 yr
0
4.05458990847335
0
ac-ft
Pre Composite CN
0
0
0
Practice Drainage Area Runoff Calculator
This tool may be used to calculate the required treatment volumes for the area draining to an individual practice where the practices drainage area is only a portion of of the area draining
to a discharge point. Where the practice receives runoff from the entire area to a discharge point, this calculator will give the same information as the Standards Compliance Workbook.
Precipitation Data
Storm
Precipitation (inches)
Drainage Area Information
Pre Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
Post Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
TV of upstream practices:
Treatment Standard
Channel Protection (Hydrologic Condition Method)
Overbank Flood
Extreme Flood
Information for Calculating TC by the Watershed Lag Method
Pre Development
Post Development, upstream of practice
Post Development, with TV credit from practice
* Preciptation values shall be obtained from
WQ Storm
1
Hydrologic Soil Group
A
0
0
0
0
0
Hydrologic Soil Group
A
0
0
0
0.193353257575758
0.193353257575758
0
Required Treatment Volume
4.36156205544904E-02
7.86520594331671E-02
0.120424439892214
Average Catchment Slope, Y (%)
0.0765
0.01
0
1 yr, 24 hr
1.87
B
0
0
0
0
0
B
0
0
0
2.69575987144169E-02
2.69575987144169E-02
ac-ft
Post Development Runoff Volume
4.36156205544904E-02
7.86520594331671E-02
0.120424439892214
Hydraulic Length, l (ft)
915
70
10 yr, 24 hr
3.2
C
0
0
0
0
0
C
0
0
0
9.77445041322314E-02
9.77445041322314E-02
Pre-development Runoff Volume
0
0
0
Time of Concentration, TC (min)
1 yr
0
1.79384115352286
0
Project Name:
Discharge Point:
Treatment Wetland #
NOAA Atlas 14
100 yr, 24 hr
4.78
D
0
0
0
0
0
D
0
0
0
0
0
TV credit of this practice:
Post Composite CN (to practice)
98
97.9999999999999
97.9999999999999
10 yr
0
1.79384115352286
0
DoubleTree & Catamount Woods
1
1
Total (acres)
0
0
0
0
0
Total (acres)
0
0
0
0.318055360422406
0.318055360422406
0
CNAdj (with TV practice credit)
98
97.9999999999999
97.9999999999999
100 yr
0
1.79384115352286
0
ac-ft
Pre Composite CN
0
0
0
Practice Drainage Area Runoff Calculator
This tool may be used to calculate the required treatment volumes for the area draining to an individual practice where the practices drainage area is only a portion of of the area draining
to a discharge point. Where the practice receives runoff from the entire area to a discharge point, this calculator will give the same information as the Standards Compliance Workbook.
Precipitation Data
Storm
Precipitation (inches)
Drainage Area Information
Pre Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
Post Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
TV of upstream practices:
Treatment Standard
Channel Protection (Hydrologic Condition Method)
Overbank Flood
Extreme Flood
Information for Calculating TC by the Watershed Lag Method
Pre Development
Post Development, upstream of practice
Post Development, with TV credit from practice
* Preciptation values shall be obtained from
WQ Storm
1
Hydrologic Soil Group
A
0
0
0
0
0
Hydrologic Soil Group
A
0
0
0
0.695082465564738
0.695082465564738
0
Required Treatment Volume
0.318638312947249
0.578501264614191
0.890245666946976
Average Catchment Slope, Y (%)
0.0765
0.01
0
1 yr, 24 hr
1.87
B
0
0
0
0
0
B
0
0
0
0
0
ac-ft
Post Development Runoff Volume
0.318638312947249
0.578501264614191
0.890245666946976
Hydraulic Length, l (ft)
915
70
10 yr, 24 hr
3.2
C
0
0
0
0
0
C
7.64121051423324E-02
0
0
1.23157564279155
1.30798774793388
Pre-development Runoff Volume
0
0
0
Time of Concentration, TC (min)
1 yr
0
1.84657432497283
0
Project Name:
Discharge Point:
Treatment Wetland #
NOAA Atlas 14
100 yr, 24 hr
4.78
D
0
0
0
0
0
D
1.44863016528926E-02
0
0
0.379140890725436
0.393627192378329
TV credit of this practice:
Post Composite CN (to practice)
97.5137474987763
97.3632972561251
97.2562582036521
10 yr
0
1.86286527278929
0
DoubleTree & Catamount Woods
1
1
Total (acres)
0
0
0
0
0
Total (acres)
0.090898406795225
0
0
2.30579899908173
2.39669740587695
0
CNAdj (with TV practice credit)
97.5137474987763
97.3632972561251
97.2562582036521
100 yr
0
1.874449055724
0
ac-ft
Pre Composite CN
0
0
0
Practice Drainage Area Runoff Calculator
This tool may be used to calculate the required treatment volumes for the area draining to an individual practice where the practices drainage area is only a portion of of the area draining
to a discharge point. Where the practice receives runoff from the entire area to a discharge point, this calculator will give the same information as the Standards Compliance Workbook.
Precipitation Data
Storm
Precipitation (inches)
Drainage Area Information
Pre Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
Post Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
TV of upstream practices:
Treatment Standard
Channel Protection (Hydrologic Condition Method)
Overbank Flood
Extreme Flood
Information for Calculating TC by the Watershed Lag Method
Pre Development
Post Development, upstream of practice
Post Development, with TV credit from practice
* Preciptation values shall be obtained from
WQ Storm
1
Hydrologic Soil Group
A
0
0
0
0
0
Hydrologic Soil Group
A
1.18251603305785
0
0
1.48459929063361
2.66711532369146
0
Required Treatment Volume
0.214137774228045
0.387013819121243
0.608927296831818
Average Catchment Slope, Y (%)
0.0765
0.03
0
1 yr, 24 hr
1.87
B
0
0
0
0
0
B
0
0
0
0
0
ac-ft
Post Development Runoff Volume
0.214137774228045
0.387013819121243
0.608927296831818
Hydraulic Length, l (ft)
915
254
10 yr, 24 hr
3.2
C
0
0
0
0
0
C
0
0
0
0
0
Pre-development Runoff Volume
0
0
0
Time of Concentration, TC (min)
1 yr
0
4.44808908175174
0
Project Name:
Discharge Point:
Treatment Wetland #
NOAA Atlas 14
100 yr, 24 hr
4.78
D
0
0
0
0
0
D
1.88140151515152E-02
0
0
7.13988429752066E-02
9.02128581267218E-02
TV credit of this practice:
Post Composite CN (to practice)
89.1744549800749
84.0264609153965
79.4176821387466
10 yr
0
5.37449313947357
0
DoubleTree & Catamount Woods
1
1
Total (acres)
0
0
0
0
0
Total (acres)
1.20133004820937
0
0
1.55599813360882
2.75732818181818
0
CNAdj (with TV practice credit)
89.1744549800749
84.0264609153965
79.4176821387466
100 yr
0
6.24106802741743
0
ac-ft
Pre Composite CN
0
0
0
Practice Drainage Area Runoff Calculator
This tool may be used to calculate the required treatment volumes for the area draining to an individual practice where the practices drainage area is only a portion of of the area draining
to a discharge point. Where the practice receives runoff from the entire area to a discharge point, this calculator will give the same information as the Standards Compliance Workbook.
Precipitation Data
Storm
Precipitation (inches)
Drainage Area Information
Pre Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
Post Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
TV of upstream practices:
Treatment Standard
Channel Protection (Hydrologic Condition Method)
Overbank Flood
Extreme Flood
Information for Calculating TC by the Watershed Lag Method
Pre Development
Post Development, upstream of practice
Post Development, with TV credit from practice
* Preciptation values shall be obtained from
WQ Storm
1
Hydrologic Soil Group
A
0
0
0
0
0
Hydrologic Soil Group
A
0.452850748393021
0
0
0.764282525252525
1.21713327364555
0
Required Treatment Volume
0.174356171547034
0.335677508862599
0.542268768403967
Average Catchment Slope, Y (%)
0.0765
0.06
0
1 yr, 24 hr
1.87
B
0
0
0
0
0
B
0
0
0
0
0
ac-ft
Post Development Runoff Volume
0.174356171547034
0.335677508862599
0.542268768403967
Hydraulic Length, l (ft)
915.2481
575
10 yr, 24 hr
3.2
C
0
0
0
0
0
C
0
0
0
0
0
Pre-development Runoff Volume
0
0
0
Time of Concentration, TC (min)
1 yr
0
5.74327646608346
0
Project Name:
Discharge Point:
Treatment Wetland #
NOAA Atlas 14
100 yr, 24 hr
4.78
D
0
0
0
0
0
D
0.483521896235078
0
0
0.364660107897153
0.848182004132231
TV credit of this practice:
Post Composite CN (to practice)
90.4409613974139
87.4357772134837
84.848132484932
10 yr
0
6.46695237563446
0
DoubleTree & Catamount Woods
1
1
Total (acres)
0
0
0
0
0
Total (acres)
0.936372644628099
0
0
1.12894263314968
2.06531527777778
0
CNAdj (with TV practice credit)
90.4409613974139
87.4357772134837
84.848132484932
100 yr
0
7.10175998971331
0
ac-ft
Pre Composite CN
0
0
0
Practice Drainage Area Runoff Calculator
This tool may be used to calculate the required treatment volumes for the area draining to an individual practice where the practices drainage area is only a portion of of the area draining
to a discharge point. Where the practice receives runoff from the entire area to a discharge point, this calculator will give the same information as the Standards Compliance Workbook.
Precipitation Data
Storm
Precipitation (inches)
Drainage Area Information
Pre Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
Post Development Land Use (acres)
Landuse
Grass
Meadow
Woods
Pavement, roofs, and other impervious
Total
TV of upstream practices:
Treatment Standard
Channel Protection (Hydrologic Condition Method)
Overbank Flood
Extreme Flood
Information for Calculating TC by the Watershed Lag Method
Pre Development
Post Development, upstream of practice
Post Development, with TV credit from practice
* Preciptation values shall be obtained from
WQ Storm
1
Hydrologic Soil Group
A
0
0
0
0
0
Hydrologic Soil Group
A
0.333082559687787
0
0
0.518112024793388
0.851194584481175
0
Required Treatment Volume
0.205756628626735
0.394466745678067
0.635437442542971
Average Catchment Slope, Y (%)
0.0765
0.08
0
1 yr, 24 hr
1.87
B
0
0
0
0
0
B
5.00090955004591E-02
0
0
0.277299674012856
0.327308769513315
ac-ft
Post Development Runoff Volume
0.205756628626735
0.394466745678067
0.635437442542971
Hydraulic Length, l (ft)
915.2481
217
0
10 yr, 24 hr
3.2
C
0
0
0
0
0
C
0.32398705922865
0
0
0.393628741965106
0.717615801193756
Pre-development Runoff Volume
0
0
0
Time of Concentration, TC (min)
1 yr
0
2.18330771481379
0
Project Name:
Discharge Point:
Treatment Wetland #
NOAA Atlas 14
100 yr, 24 hr
4.78
D
0
0
0
0
0
D
0.18438468778696
0
0
0.198209692378329
0.382594380165289
TV credit of this practice:
Post Composite CN (to practice)
91.4724018723412
88.9506870318216
86.8558671969832
10 yr
0
2.42292003700018
0
DoubleTree & Catamount Woods
1
1
Total (acres)
0
0
0
0
0
Total (acres)
0.891463402203857
0
0
1.38725013314968
2.27871353535354
0
CNAdj (with TV practice credit)
91.4724018723412
88.9506870318216
86.8558671969832
100 yr
0
2.62448133888515
0
ac-ft
Pre Composite CN
0
0
0
Curve Numbers
Landuse
Grass
Meadow
Woods
Gravel/ Unpaved Roads
Pavement, Roofs, and other impervious
S=1000/CN - 10
Landuse
Grass
Meadow
Woods
Gravel/ Unpaved Roads
Pavement, Roofs, and other impervious (not gravel)
Recharge Factors
Hydrologic Soil Group
Recharge Factor
Hydrologic Soil Group
A
39
30
30
96
98
Hydrologic Soil Group
A
15.6410256410256
23.3333333333333
23.3333333333333
0.416666666666666
0.204081632653061
A
0.6
B
61
58
55
96
98
B
6.39344262295082
7.24137931034483
8.18181818181818
0.416666666666666
0.204081632653061
B
0.35
C
74
71
70
96
98
C
3.51351351351351
4.08450704225352
4.28571428571429
0.416666666666666
0.204081632653061
C
0.25
D
80
78
77
96
98
D
2.5
2.82051282051282
2.98701298701299
0.416666666666666
0.204081632653061
D
0