Addington Crossing Subdivision - HydroCAD Report WS1 R

BP-1
BP-1
BP-2
BP-2
BP-4
Basin T
DET1
Det 1
DET2
Det-2
DET3
Det 3
DR-1
DR-1
DR-2
DR-2
Ex-1
Ex WS #1
Ex-2
Ex-2 Ex-HH
Ex HH
Ex-PR
(new Subcat)
P-1
Det Pond 1
P-2
Det Pond 2
P-3
Det Pond 3
CP1
CP1
CP3
CulvertXCP1
XCP1
Routing Diagram for USI Revision WS1_Detention R
Prepared by Cardno, Printed 8/15/2017
HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Subcat Reach Pond Link
USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 2HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pipe Listing (all nodes)
Line# Node
Number
In-Invert
(feet)
Out-Invert
(feet)
Length
(feet)
Slope
(ft/ft)
n Diam/Width
(inches)
Height
(inches)
Inside-Fill
(inches)
1 BP-1 0.00 0.00 492.0 0.0103 0.013 36.0 0.0 0.0
2 DET1 0.00 0.00 138.0 0.0057 0.013 24.0 0.0 0.0
3 DET2 0.00 0.00 944.0 0.0200 0.013 24.0 0.0 0.0
4 DET3 0.00 0.00 586.0 0.0100 0.013 24.0 0.0 0.0
5 P-1 610.83 610.58 45.2 0.0055 0.013 24.0 0.0 0.0
6 P-2 589.83 589.33 43.8 0.0114 0.013 36.0 0.0 0.0
7 P-3 581.83 581.58 33.0 0.0076 0.013 30.0 0.0 0.0
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 3HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-1: BP-1
Runoff = 26.58 cfs @ 12.27 hrs, Volume= 115,438 cf, Depth= 2.02"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (ac) CN Description
10.308 70 Woods, Good, HSG C
2.590 58 Meadow, non-grazed, HSG B
2.820 68 1 acre lots, 20% imp, HSG B
15.718 68 Weighted Average
15.154 96.41% Pervious Area
0.564 3.59% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.7 150 0.0430 0.12 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
3.8 766 0.0430 3.34 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.7 199 0.0300 4.91 19.65 Trap/Vee/Rect Channel Flow, Channel
Bot.W=1.00' D=1.00' Z= 3.0 '/' Top.W=7.00'
n= 0.035
0.9 492 0.0103 9.58 67.69 Pipe Channel, Culvert
36.0" Round Area= 7.1 sf Perim= 9.4' r= 0.75'
n= 0.013
0.2 82 0.0200 7.26 126.24 Channel Flow, Channel 1
Area= 17.4 sf Perim= 13.1' r= 1.33' n= 0.035
3.8 1,965 0.0210 8.58 231.62 Channel Flow, Main Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
30.1 3,654 Total
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 4HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Subcatchment BP-1: BP-1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
10-Year Rainfall=5.20"
Runoff Area=15.718 ac
Runoff Volume=115,438 cf
Runoff Depth=2.02"
Flow Length=3,654'
Tc=30.1 min
CN=68
26.58 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 5HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-2: BP-2
Runoff = 66.42 cfs @ 12.20 hrs, Volume= 267,721 cf, Depth= 1.64"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (ac) CN Description
18.072 70 Woods, Good, HSG C
26.981 58 Meadow, non-grazed, HSG B
45.053 63 Weighted Average
45.053 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
15.0 150 0.0350 0.17 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
6.1 1,162 0.0390 3.18 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
4.2 2,174 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
25.3 3,486 Total
Subcatchment BP-2: BP-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
10-Year Rainfall=5.20"
Runoff Area=45.053 ac
Runoff Volume=267,721 cf
Runoff Depth=1.64"
Flow Length=3,486'
Tc=25.3 min
CN=63
66.42 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 6HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-4: Basin T
Runoff = 3.29 cfs @ 12.14 hrs, Volume= 11,732 cf, Depth= 1.28"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (sf) CN Description
109,957 58 Meadow, non-grazed, HSG B
109,957 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.9 150 0.0510 0.19 Sheet Flow,
Grass: Dense n= 0.240 P2= 3.56"
6.0 1,003 0.0300 2.79 Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
18.9 1,153 Total
Subcatchment BP-4: Basin T
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)3
2
1
0
Type II 24-hr
10-Year Rainfall=5.20"
Runoff Area=109,957 sf
Runoff Volume=11,732 cf
Runoff Depth=1.28"
Flow Length=1,153'
Tc=18.9 min
CN=58
3.29 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 7HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET1: Det 1
Runoff = 14.39 cfs @ 11.98 hrs, Volume= 29,745 cf, Depth= 2.02"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (sf) CN Description
* 176,424 68 1 acre lots, 20% imp, HSG B
141,139 80.00% Pervious Area
35,285 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.1 50 0.1000 0.20 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
1.1 140 0.0167 2.08 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.9 160 0.0200 2.87 Shallow Concentrated Flow, Shallow
Paved Kv= 20.3 fps
0.4 138 0.0057 5.44 17.08 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
6.5 488 Total
Subcatchment DET1: Det 1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Type II 24-hr
10-Year Rainfall=5.20"
Runoff Area=176,424 sf
Runoff Volume=29,745 cf
Runoff Depth=2.02"
Flow Length=488'
Tc=6.5 min
CN=68
14.39 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 8HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET2: Det-2
Runoff = 36.26 cfs @ 12.02 hrs, Volume= 83,550 cf, Depth= 2.02"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (sf) CN Description
495,548 68 1 acre lots, 20% imp, HSG B
396,438 80.00% Pervious Area
99,110 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.5 80 0.2000 0.30 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
2.0 270 0.0200 2.28 Shallow Concentrated Flow, Swale
Unpaved Kv= 16.1 fps
1.0 154 0.0162 2.58 Shallow Concentrated Flow, Gutter
Paved Kv= 20.3 fps
1.5 944 0.0200 10.18 31.99 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
0.3 100 0.0100 5.13 89.27 Channel Flow, Swale
Area= 17.4 sf Perim= 13.1' r= 1.33' n= 0.035
9.3 1,548 Total
Subcatchment DET2: Det-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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
10-Year Rainfall=5.20"
Runoff Area=495,548 sf
Runoff Volume=83,550 cf
Runoff Depth=2.02"
Flow Length=1,548'
Tc=9.3 min
CN=68
36.26 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 9HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET3: Det 3
Runoff = 23.46 cfs @ 12.02 hrs, Volume= 56,519 cf, Depth= 2.97"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (sf) CN Description
228,009 79 1 acre lots, 20% imp, HSG C
182,407 80.00% Pervious Area
45,602 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.2 118 0.1360 0.27 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
1.1 136 0.0150 1.97 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.8 96 0.0100 2.03 Shallow Concentrated Flow, Shallow
Paved Kv= 20.3 fps
1.4 586 0.0100 7.20 22.62 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
10.5 936 Total
Subcatchment DET3: Det 3
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (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
10-Year Rainfall=5.20"
Runoff Area=228,009 sf
Runoff Volume=56,519 cf
Runoff Depth=2.97"
Flow Length=936'
Tc=10.5 min
CN=79
23.46 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 10HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-1: DR-1
Runoff = 31.35 cfs @ 11.96 hrs, Volume= 62,093 cf, Depth= 2.97"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (sf) CN Description
250,493 79 1 acre lots, 20% imp, HSG C
200,394 80.00% Pervious Area
50,099 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DR-1: DR-1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
10-Year Rainfall=5.20"
Runoff Area=250,493 sf
Runoff Volume=62,093 cf
Runoff Depth=2.97"
Tc=5.0 min
CN=79
31.35 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 11HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-2: DR-2
Runoff = 20.30 cfs @ 11.96 hrs, Volume= 40,204 cf, Depth= 2.97"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (sf) CN Description
162,192 79 1 acre lots, 20% imp, HSG C
129,754 80.00% Pervious Area
32,438 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DR-2: DR-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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
10-Year Rainfall=5.20"
Runoff Area=162,192 sf
Runoff Volume=40,204 cf
Runoff Depth=2.97"
Tc=5.0 min
CN=79
20.30 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 12HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-1: Ex WS #1
Runoff = 106.30 cfs @ 12.20 hrs, Volume= 424,141 cf, Depth= 1.71"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (sf) CN Description
1,448,958 70 Woods, Good, HSG C
1,524,134 58 Meadow, non-grazed, HSG B
2,973,092 64 Weighted Average
2,973,092 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
15.0 150 0.0350 0.17 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
6.1 1,162 0.0390 3.18 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
4.2 2,174 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
25.3 3,486 Total
Subcatchment Ex-1: Ex WS #1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)115
110
105
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
10-Year Rainfall=5.20"
Runoff Area=2,973,092 sf
Runoff Volume=424,141 cf
Runoff Depth=1.71"
Flow Length=3,486'
Tc=25.3 min
CN=64
106.30 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 13HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-2: Ex-2
Runoff = 19.08 cfs @ 12.26 hrs, Volume= 82,757 cf, Depth= 2.19"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (sf) CN Description
454,331 70 Woods, Good, HSG C
454,331 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.7 150 0.0430 0.12 Sheet Flow, Shallow
Woods: Light underbrush n= 0.400 P2= 3.56"
3.8 766 0.0430 3.34 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
2.4 693 0.0300 4.91 19.65 Trap/Vee/Rect Channel Flow, Channel Flow
Bot.W=1.00' D=1.00' Z= 3.0 '/' Top.W=7.00'
n= 0.035 Earth, dense weeds
3.6 1,844 0.0210 8.58 231.62 Channel Flow,
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
30.5 3,453 Total
Subcatchment Ex-2: Ex-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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
10-Year Rainfall=5.20"
Runoff Area=454,331 sf
Runoff Volume=82,757 cf
Runoff Depth=2.19"
Flow Length=3,453'
Tc=30.5 min
CN=70
19.08 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 14HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-HH: Ex HH
Runoff = 17.77 cfs @ 12.26 hrs, Volume= 77,837 cf, Depth= 2.19"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (sf) CN Description
427,324 70 Woods, Good, HSG C
427,324 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
27.9 148 0.0200 0.09 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
1.8 474 0.0720 4.32 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
1.3 646 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
31.0 1,268 Total
Subcatchment Ex-HH: Ex HH
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Type II 24-hr
10-Year Rainfall=5.20"
Runoff Area=427,324 sf
Runoff Volume=77,837 cf
Runoff Depth=2.19"
Flow Length=1,268'
Tc=31.0 min
CN=70
17.77 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 15HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-PR: (new Subcat)
Runoff = 7.61 cfs @ 11.90 hrs, Volume= 12,735 cf, Depth= 1.28"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 10-Year Rainfall=5.20"
Area (sf) CN Description
119,354 58 Meadow, non-grazed, HSG B
119,354 100.00% Pervious Area
Subcatchment Ex-PR: (new Subcat)
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)8
7
6
5
4
3
2
1
0
Type II 24-hr
10-Year Rainfall=5.20"
Runoff Area=119,354 sf
Runoff Volume=12,735 cf
Runoff Depth=1.28"
Tc=0.0 min
CN=58
7.61 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 16HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-1: Det Pond 1
Inflow Area = 176,424 sf, 20.00% Impervious, Inflow Depth = 2.02" for 10-Year event
Inflow = 14.39 cfs @ 11.98 hrs, Volume= 29,745 cf
Outflow = 9.83 cfs @ 12.05 hrs, Volume= 25,995 cf, Atten= 32%, Lag= 3.9 min
Primary = 9.83 cfs @ 12.05 hrs, Volume= 25,995 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 615.76' @ 12.05 hrs Surf.Area= 5,478 sf Storage= 7,874 cf
Plug-Flow detention time= 97.4 min calculated for 25,995 cf (87% of inflow)
Center-of-Mass det. time= 35.7 min ( 883.4 - 847.7 )
Volume Invert Avail.Storage Storage Description
#1 614.00' 15,561 cf Bio Retention Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
614.00 3,548 0 0
615.00 4,590 4,069 4,069
616.00 5,765 5,178 9,247
617.00 6,864 6,315 15,561
Device Routing Invert Outlet Devices
#1 Primary 610.83'24.0" Round Culvert
L= 45.2' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 610.83' / 610.58' S= 0.0055 '/' Cc= 0.900
n= 0.013, Flow Area= 3.14 sf
#2 Device 1 614.93'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 4.00 4.00
#3 Secondary 616.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=9.82 cfs @ 12.05 hrs HW=615.76' (Free Discharge)
1=Culvert (Passes 9.82 cfs of 29.97 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 9.82 cfs @ 2.98 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=614.00' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 17HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-1: Det Pond 1
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Inflow Area=176,424 sf
Peak Elev=615.76'
Storage=7,874 cf
14.39 cfs
9.83 cfs9.83 cfs
0.00 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
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Page 18HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-2: Det Pond 2
Inflow Area = 495,548 sf, 20.00% Impervious, Inflow Depth = 2.02" for 10-Year event
Inflow = 36.26 cfs @ 12.02 hrs, Volume= 83,550 cf
Outflow = 31.97 cfs @ 12.06 hrs, Volume= 77,724 cf, Atten= 12%, Lag= 2.6 min
Primary = 31.97 cfs @ 12.06 hrs, Volume= 77,724 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 595.01' @ 12.06 hrs Surf.Area= 9,300 sf Storage= 13,406 cf
Plug-Flow detention time= 56.6 min calculated for 77,716 cf (93% of inflow)
Center-of-Mass det. time= 19.1 min ( 869.4 - 850.3 )
Volume Invert Avail.Storage Storage Description
#1 593.00' 46,534 cf Bio Pond Two (Prismatic) Listed below (Recalc)
Elevation Surf.Area Voids Inc.Store Cum.Store
(feet) (sq-ft) (%) (cubic-feet) (cubic-feet)
593.00 5,313 0.0 0 0
594.00 5,978 100.0 5,646 5,646
595.00 9,284 100.0 7,631 13,277
596.00 10,454 100.0 9,869 23,146
597.00 11,680 100.0 11,067 34,213
598.00 12,963 100.0 12,322 46,534
Device Routing Invert Outlet Devices
#1 Primary 589.83'36.0" Round Culvert
L= 43.8' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 589.83' / 589.33' S= 0.0114 '/' Cc= 0.900
n= 0.013, Flow Area= 7.07 sf
#2 Device 1 594.03'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 10.00 10.00 12.00 12.00
#3 Secondary 597.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=31.94 cfs @ 12.06 hrs HW=595.01' (Free Discharge)
1=Culvert (Passes 31.94 cfs of 65.32 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 31.94 cfs @ 3.25 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=593.00' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 19HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-2: Det Pond 2
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=495,548 sf
Peak Elev=595.01'
Storage=13,406 cf
36.26 cfs
31.97 cfs31.97 cfs
0.00 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 20HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-3: Det Pond 3
Inflow Area = 228,009 sf, 20.00% Impervious, Inflow Depth = 2.97" for 10-Year event
Inflow = 23.46 cfs @ 12.02 hrs, Volume= 56,519 cf
Outflow = 18.88 cfs @ 12.08 hrs, Volume= 50,081 cf, Atten= 20%, Lag= 3.7 min
Primary = 18.88 cfs @ 12.08 hrs, Volume= 50,081 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 586.55' @ 12.08 hrs Surf.Area= 10,463 sf Storage= 14,314 cf
Plug-Flow detention time= 91.6 min calculated for 50,076 cf (89% of inflow)
Center-of-Mass det. time= 35.2 min ( 859.0 - 823.8 )
Volume Invert Avail.Storage Storage Description
#1 585.00' 31,098 cf Bio Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
585.00 8,010 0 0
586.00 9,541 8,776 8,776
587.00 11,206 10,374 19,149
588.00 12,692 11,949 31,098
Device Routing Invert Outlet Devices
#1 Primary 581.83'30.0" Round Culvert
L= 33.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 581.83' / 581.58' S= 0.0076 '/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1 585.75'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 8.00 8.00 12.00 12.00
#3 Secondary 587.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=18.86 cfs @ 12.08 hrs HW=586.55' (Free Discharge)
1=Culvert (Passes 18.86 cfs of 44.05 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 18.86 cfs @ 2.94 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=585.00' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 21HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-3: Det Pond 3
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=228,009 sf
Peak Elev=586.55'
Storage=14,314 cf
23.46 cfs
18.88 cfs18.88 cfs
0.00 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
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Page 22HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP1: CP1
Inflow Area = 3,959,851 sf, 7.25% Impervious, Inflow Depth = 1.94" for 10-Year event
Inflow = 140.15 cfs @ 12.11 hrs, Volume= 639,256 cf
Primary = 140.15 cfs @ 12.11 hrs, Volume= 639,256 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP1: CP1
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=3,959,851 sf
140.15 cfs140.15 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 23HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP3: Culvert
Inflow Area = 3,569,650 sf, 5.86% Impervious, Inflow Depth = 1.85" for 10-Year event
Inflow = 119.25 cfs @ 12.15 hrs, Volume= 548,970 cf
Primary = 119.25 cfs @ 12.15 hrs, Volume= 548,970 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP3: Culvert
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=3,569,650 sf
119.25 cfs119.25 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 24HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link XCP1: XCP1
Inflow Area = 3,854,747 sf, 0.00% Impervious, Inflow Depth = 1.82" for 10-Year event
Inflow = 142.07 cfs @ 12.22 hrs, Volume= 584,735 cf
Primary = 142.07 cfs @ 12.22 hrs, Volume= 584,735 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link XCP1: XCP1
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=3,854,747 sf
142.07 cfs142.07 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 25HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-1: BP-1
Runoff = 37.11 cfs @ 12.25 hrs, Volume= 158,349 cf, Depth= 2.78"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (ac) CN Description
10.308 70 Woods, Good, HSG C
2.590 58 Meadow, non-grazed, HSG B
2.820 68 1 acre lots, 20% imp, HSG B
15.718 68 Weighted Average
15.154 96.41% Pervious Area
0.564 3.59% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.7 150 0.0430 0.12 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
3.8 766 0.0430 3.34 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.7 199 0.0300 4.91 19.65 Trap/Vee/Rect Channel Flow, Channel
Bot.W=1.00' D=1.00' Z= 3.0 '/' Top.W=7.00'
n= 0.035
0.9 492 0.0103 9.58 67.69 Pipe Channel, Culvert
36.0" Round Area= 7.1 sf Perim= 9.4' r= 0.75'
n= 0.013
0.2 82 0.0200 7.26 126.24 Channel Flow, Channel 1
Area= 17.4 sf Perim= 13.1' r= 1.33' n= 0.035
3.8 1,965 0.0210 8.58 231.62 Channel Flow, Main Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
30.1 3,654 Total
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 26HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Subcatchment BP-1: BP-1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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
25-Year Rainfall=6.20"
Runoff Area=15.718 ac
Runoff Volume=158,349 cf
Runoff Depth=2.78"
Flow Length=3,654'
Tc=30.1 min
CN=68
37.11 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 27HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-2: BP-2
Runoff = 97.28 cfs @ 12.20 hrs, Volume= 378,973 cf, Depth= 2.32"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (ac) CN Description
18.072 70 Woods, Good, HSG C
26.981 58 Meadow, non-grazed, HSG B
45.053 63 Weighted Average
45.053 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
15.0 150 0.0350 0.17 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
6.1 1,162 0.0390 3.18 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
4.2 2,174 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
25.3 3,486 Total
Subcatchment BP-2: BP-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)105
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
25-Year Rainfall=6.20"
Runoff Area=45.053 ac
Runoff Volume=378,973 cf
Runoff Depth=2.32"
Flow Length=3,486'
Tc=25.3 min
CN=63
97.28 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 28HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-4: Basin T
Runoff = 5.12 cfs @ 12.12 hrs, Volume= 17,251 cf, Depth= 1.88"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (sf) CN Description
109,957 58 Meadow, non-grazed, HSG B
109,957 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.9 150 0.0510 0.19 Sheet Flow,
Grass: Dense n= 0.240 P2= 3.56"
6.0 1,003 0.0300 2.79 Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
18.9 1,153 Total
Subcatchment BP-4: Basin T
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)5
4
3
2
1
0
Type II 24-hr
25-Year Rainfall=6.20"
Runoff Area=109,957 sf
Runoff Volume=17,251 cf
Runoff Depth=1.88"
Flow Length=1,153'
Tc=18.9 min
CN=58
5.12 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 29HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET1: Det 1
Runoff = 19.78 cfs @ 11.98 hrs, Volume= 40,803 cf, Depth= 2.78"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (sf) CN Description
* 176,424 68 1 acre lots, 20% imp, HSG B
141,139 80.00% Pervious Area
35,285 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.1 50 0.1000 0.20 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
1.1 140 0.0167 2.08 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.9 160 0.0200 2.87 Shallow Concentrated Flow, Shallow
Paved Kv= 20.3 fps
0.4 138 0.0057 5.44 17.08 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
6.5 488 Total
Subcatchment DET1: Det 1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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
25-Year Rainfall=6.20"
Runoff Area=176,424 sf
Runoff Volume=40,803 cf
Runoff Depth=2.78"
Flow Length=488'
Tc=6.5 min
CN=68
19.78 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 30HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET2: Det-2
Runoff = 49.97 cfs @ 12.01 hrs, Volume= 114,609 cf, Depth= 2.78"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (sf) CN Description
495,548 68 1 acre lots, 20% imp, HSG B
396,438 80.00% Pervious Area
99,110 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.5 80 0.2000 0.30 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
2.0 270 0.0200 2.28 Shallow Concentrated Flow, Swale
Unpaved Kv= 16.1 fps
1.0 154 0.0162 2.58 Shallow Concentrated Flow, Gutter
Paved Kv= 20.3 fps
1.5 944 0.0200 10.18 31.99 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
0.3 100 0.0100 5.13 89.27 Channel Flow, Swale
Area= 17.4 sf Perim= 13.1' r= 1.33' n= 0.035
9.3 1,548 Total
Subcatchment DET2: Det-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
25-Year Rainfall=6.20"
Runoff Area=495,548 sf
Runoff Volume=114,609 cf
Runoff Depth=2.78"
Flow Length=1,548'
Tc=9.3 min
CN=68
49.97 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 31HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET3: Det 3
Runoff = 30.21 cfs @ 12.02 hrs, Volume= 73,319 cf, Depth= 3.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (sf) CN Description
228,009 79 1 acre lots, 20% imp, HSG C
182,407 80.00% Pervious Area
45,602 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.2 118 0.1360 0.27 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
1.1 136 0.0150 1.97 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.8 96 0.0100 2.03 Shallow Concentrated Flow, Shallow
Paved Kv= 20.3 fps
1.4 586 0.0100 7.20 22.62 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
10.5 936 Total
Subcatchment DET3: Det 3
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
25-Year Rainfall=6.20"
Runoff Area=228,009 sf
Runoff Volume=73,319 cf
Runoff Depth=3.86"
Flow Length=936'
Tc=10.5 min
CN=79
30.21 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 32HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-1: DR-1
Runoff = 40.22 cfs @ 11.96 hrs, Volume= 80,549 cf, Depth= 3.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (sf) CN Description
250,493 79 1 acre lots, 20% imp, HSG C
200,394 80.00% Pervious Area
50,099 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DR-1: DR-1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)44
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
25-Year Rainfall=6.20"
Runoff Area=250,493 sf
Runoff Volume=80,549 cf
Runoff Depth=3.86"
Tc=5.0 min
CN=79
40.22 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 33HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-2: DR-2
Runoff = 26.04 cfs @ 11.96 hrs, Volume= 52,155 cf, Depth= 3.86"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (sf) CN Description
162,192 79 1 acre lots, 20% imp, HSG C
129,754 80.00% Pervious Area
32,438 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DR-2: DR-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
25-Year Rainfall=6.20"
Runoff Area=162,192 sf
Runoff Volume=52,155 cf
Runoff Depth=3.86"
Tc=5.0 min
CN=79
26.04 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 34HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-1: Ex WS #1
Runoff = 153.99 cfs @ 12.20 hrs, Volume= 596,369 cf, Depth= 2.41"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (sf) CN Description
1,448,958 70 Woods, Good, HSG C
1,524,134 58 Meadow, non-grazed, HSG B
2,973,092 64 Weighted Average
2,973,092 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
15.0 150 0.0350 0.17 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
6.1 1,162 0.0390 3.18 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
4.2 2,174 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
25.3 3,486 Total
Subcatchment Ex-1: Ex WS #1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Type II 24-hr
25-Year Rainfall=6.20"
Runoff Area=2,973,092 sf
Runoff Volume=596,369 cf
Runoff Depth=2.41"
Flow Length=3,486'
Tc=25.3 min
CN=64
153.99 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 35HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-2: Ex-2
Runoff = 26.28 cfs @ 12.24 hrs, Volume= 112,247 cf, Depth= 2.96"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (sf) CN Description
454,331 70 Woods, Good, HSG C
454,331 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.7 150 0.0430 0.12 Sheet Flow, Shallow
Woods: Light underbrush n= 0.400 P2= 3.56"
3.8 766 0.0430 3.34 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
2.4 693 0.0300 4.91 19.65 Trap/Vee/Rect Channel Flow, Channel Flow
Bot.W=1.00' D=1.00' Z= 3.0 '/' Top.W=7.00'
n= 0.035 Earth, dense weeds
3.6 1,844 0.0210 8.58 231.62 Channel Flow,
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
30.5 3,453 Total
Subcatchment Ex-2: Ex-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
25-Year Rainfall=6.20"
Runoff Area=454,331 sf
Runoff Volume=112,247 cf
Runoff Depth=2.96"
Flow Length=3,453'
Tc=30.5 min
CN=70
26.28 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 36HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-HH: Ex HH
Runoff = 24.45 cfs @ 12.26 hrs, Volume= 105,575 cf, Depth= 2.96"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (sf) CN Description
427,324 70 Woods, Good, HSG C
427,324 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
27.9 148 0.0200 0.09 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
1.8 474 0.0720 4.32 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
1.3 646 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
31.0 1,268 Total
Subcatchment Ex-HH: Ex HH
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
25-Year Rainfall=6.20"
Runoff Area=427,324 sf
Runoff Volume=105,575 cf
Runoff Depth=2.96"
Flow Length=1,268'
Tc=31.0 min
CN=70
24.45 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 37HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-PR: (new Subcat)
Runoff = 11.40 cfs @ 11.90 hrs, Volume= 18,725 cf, Depth= 1.88"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 25-Year Rainfall=6.20"
Area (sf) CN Description
119,354 58 Meadow, non-grazed, HSG B
119,354 100.00% Pervious Area
Subcatchment Ex-PR: (new Subcat)
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)12
11
10
9
8
7
6
5
4
3
2
1
0
Type II 24-hr
25-Year Rainfall=6.20"
Runoff Area=119,354 sf
Runoff Volume=18,725 cf
Runoff Depth=1.88"
Tc=0.0 min
CN=58
11.40 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
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Page 38HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-1: Det Pond 1
Inflow Area = 176,424 sf, 20.00% Impervious, Inflow Depth = 2.78" for 25-Year event
Inflow = 19.78 cfs @ 11.98 hrs, Volume= 40,803 cf
Outflow = 15.45 cfs @ 12.03 hrs, Volume= 37,052 cf, Atten= 22%, Lag= 3.2 min
Primary = 15.26 cfs @ 12.03 hrs, Volume= 37,029 cf
Secondary = 0.19 cfs @ 12.03 hrs, Volume= 24 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 616.04' @ 12.03 hrs Surf.Area= 5,806 sf Storage= 9,462 cf
Plug-Flow detention time= 76.0 min calculated for 37,052 cf (91% of inflow)
Center-of-Mass det. time= 28.2 min ( 866.7 - 838.5 )
Volume Invert Avail.Storage Storage Description
#1 614.00' 15,561 cf Bio Retention Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
614.00 3,548 0 0
615.00 4,590 4,069 4,069
616.00 5,765 5,178 9,247
617.00 6,864 6,315 15,561
Device Routing Invert Outlet Devices
#1 Primary 610.83'24.0" Round Culvert
L= 45.2' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 610.83' / 610.58' S= 0.0055 '/' Cc= 0.900
n= 0.013, Flow Area= 3.14 sf
#2 Device 1 614.93'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 4.00 4.00
#3 Secondary 616.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=15.24 cfs @ 12.03 hrs HW=616.04' (Free Discharge)
1=Culvert (Passes 15.24 cfs of 31.02 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 15.24 cfs @ 3.44 fps)
Secondary OutFlow Max=0.17 cfs @ 12.03 hrs HW=616.04' (Free Discharge)
3=Broad-Crested Rectangular Weir (Weir Controls 0.17 cfs @ 0.48 fps)
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 39HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-1: Det Pond 1
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Inflow Area=176,424 sf
Peak Elev=616.04'
Storage=9,462 cf
19.78 cfs
15.45 cfs
15.26 cfs
0.19 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 40HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-2: Det Pond 2
Inflow Area = 495,548 sf, 20.00% Impervious, Inflow Depth = 2.78" for 25-Year event
Inflow = 49.97 cfs @ 12.01 hrs, Volume= 114,609 cf
Outflow = 45.34 cfs @ 12.05 hrs, Volume= 108,782 cf, Atten= 9%, Lag= 2.3 min
Primary = 45.34 cfs @ 12.05 hrs, Volume= 108,782 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 595.26' @ 12.05 hrs Surf.Area= 9,587 sf Storage= 15,719 cf
Plug-Flow detention time= 44.2 min calculated for 108,782 cf (95% of inflow)
Center-of-Mass det. time= 15.8 min ( 856.8 - 841.1 )
Volume Invert Avail.Storage Storage Description
#1 593.00' 46,534 cf Bio Pond Two (Prismatic) Listed below (Recalc)
Elevation Surf.Area Voids Inc.Store Cum.Store
(feet) (sq-ft) (%) (cubic-feet) (cubic-feet)
593.00 5,313 0.0 0 0
594.00 5,978 100.0 5,646 5,646
595.00 9,284 100.0 7,631 13,277
596.00 10,454 100.0 9,869 23,146
597.00 11,680 100.0 11,067 34,213
598.00 12,963 100.0 12,322 46,534
Device Routing Invert Outlet Devices
#1 Primary 589.83'36.0" Round Culvert
L= 43.8' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 589.83' / 589.33' S= 0.0114 '/' Cc= 0.900
n= 0.013, Flow Area= 7.07 sf
#2 Device 1 594.03'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 10.00 10.00 12.00 12.00
#3 Secondary 597.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=45.31 cfs @ 12.05 hrs HW=595.26' (Free Discharge)
1=Culvert (Passes 45.31 cfs of 67.46 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 45.31 cfs @ 3.56 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=593.00' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 41HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-2: Det Pond 2
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)55
50
45
40
35
30
25
20
15
10
5
0
Inflow Area=495,548 sf
Peak Elev=595.26'
Storage=15,719 cf
49.97 cfs
45.34 cfs45.34 cfs
0.00 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 42HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-3: Det Pond 3
Inflow Area = 228,009 sf, 20.00% Impervious, Inflow Depth = 3.86" for 25-Year event
Inflow = 30.21 cfs @ 12.02 hrs, Volume= 73,319 cf
Outflow = 25.33 cfs @ 12.08 hrs, Volume= 66,881 cf, Atten= 16%, Lag= 3.4 min
Primary = 25.33 cfs @ 12.08 hrs, Volume= 66,881 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 586.73' @ 12.08 hrs Surf.Area= 10,753 sf Storage= 16,160 cf
Plug-Flow detention time= 77.4 min calculated for 66,881 cf (91% of inflow)
Center-of-Mass det. time= 31.3 min ( 847.7 - 816.4 )
Volume Invert Avail.Storage Storage Description
#1 585.00' 31,098 cf Bio Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
585.00 8,010 0 0
586.00 9,541 8,776 8,776
587.00 11,206 10,374 19,149
588.00 12,692 11,949 31,098
Device Routing Invert Outlet Devices
#1 Primary 581.83'30.0" Round Culvert
L= 33.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 581.83' / 581.58' S= 0.0076 '/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1 585.75'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 8.00 8.00 12.00 12.00
#3 Secondary 587.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=25.31 cfs @ 12.08 hrs HW=586.73' (Free Discharge)
1=Culvert (Passes 25.31 cfs of 45.14 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 25.31 cfs @ 3.24 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=585.00' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 43HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-3: Det Pond 3
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=228,009 sf
Peak Elev=586.73'
Storage=16,160 cf
30.21 cfs
25.33 cfs25.33 cfs
0.00 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 44HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP1: CP1
Inflow Area = 3,959,851 sf, 7.25% Impervious, Inflow Depth = 2.68" for 25-Year event
Inflow = 199.15 cfs @ 12.09 hrs, Volume= 882,742 cf
Primary = 199.15 cfs @ 12.09 hrs, Volume= 882,742 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP1: CP1
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)220
210
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=3,959,851 sf
199.15 cfs199.15 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 45HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP3: Culvert
Inflow Area = 3,569,650 sf, 5.86% Impervious, Inflow Depth = 2.57" for 25-Year event
Inflow = 170.78 cfs @ 12.14 hrs, Volume= 763,706 cf
Primary = 170.78 cfs @ 12.14 hrs, Volume= 763,706 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP3: Culvert
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=3,569,650 sf
170.78 cfs170.78 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 46HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link XCP1: XCP1
Inflow Area = 3,854,747 sf, 0.00% Impervious, Inflow Depth = 2.53" for 25-Year event
Inflow = 202.92 cfs @ 12.21 hrs, Volume= 814,192 cf
Primary = 202.92 cfs @ 12.21 hrs, Volume= 814,192 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link XCP1: XCP1
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)220
210
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=3,854,747 sf
202.92 cfs202.92 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 47HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-1: BP-1
Runoff = 46.12 cfs @ 12.24 hrs, Volume= 195,033 cf, Depth= 3.42"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (ac) CN Description
10.308 70 Woods, Good, HSG C
2.590 58 Meadow, non-grazed, HSG B
2.820 68 1 acre lots, 20% imp, HSG B
15.718 68 Weighted Average
15.154 96.41% Pervious Area
0.564 3.59% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.7 150 0.0430 0.12 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
3.8 766 0.0430 3.34 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.7 199 0.0300 4.91 19.65 Trap/Vee/Rect Channel Flow, Channel
Bot.W=1.00' D=1.00' Z= 3.0 '/' Top.W=7.00'
n= 0.035
0.9 492 0.0103 9.58 67.69 Pipe Channel, Culvert
36.0" Round Area= 7.1 sf Perim= 9.4' r= 0.75'
n= 0.013
0.2 82 0.0200 7.26 126.24 Channel Flow, Channel 1
Area= 17.4 sf Perim= 13.1' r= 1.33' n= 0.035
3.8 1,965 0.0210 8.58 231.62 Channel Flow, Main Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
30.1 3,654 Total
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 48HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Subcatchment BP-1: BP-1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)50
48
46
44
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
50-Year Rainfall=7.01"
Runoff Area=15.718 ac
Runoff Volume=195,033 cf
Runoff Depth=3.42"
Flow Length=3,654'
Tc=30.1 min
CN=68
46.12 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 49HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-2: BP-2
Runoff = 123.94 cfs @ 12.20 hrs, Volume= 475,634 cf, Depth= 2.91"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (ac) CN Description
18.072 70 Woods, Good, HSG C
26.981 58 Meadow, non-grazed, HSG B
45.053 63 Weighted Average
45.053 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
15.0 150 0.0350 0.17 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
6.1 1,162 0.0390 3.18 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
4.2 2,174 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
25.3 3,486 Total
Subcatchment BP-2: BP-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)130
120
110
100
90
80
70
60
50
40
30
20
10
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=45.053 ac
Runoff Volume=475,634 cf
Runoff Depth=2.91"
Flow Length=3,486'
Tc=25.3 min
CN=63
123.94 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 50HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-4: Basin T
Runoff = 6.74 cfs @ 12.12 hrs, Volume= 22,138 cf, Depth= 2.42"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (sf) CN Description
109,957 58 Meadow, non-grazed, HSG B
109,957 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.9 150 0.0510 0.19 Sheet Flow,
Grass: Dense n= 0.240 P2= 3.56"
6.0 1,003 0.0300 2.79 Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
18.9 1,153 Total
Subcatchment BP-4: Basin T
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)7
6
5
4
3
2
1
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=109,957 sf
Runoff Volume=22,138 cf
Runoff Depth=2.42"
Flow Length=1,153'
Tc=18.9 min
CN=58
6.74 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 51HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET1: Det 1
Runoff = 24.31 cfs @ 11.98 hrs, Volume= 50,255 cf, Depth= 3.42"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (sf) CN Description
* 176,424 68 1 acre lots, 20% imp, HSG B
141,139 80.00% Pervious Area
35,285 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.1 50 0.1000 0.20 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
1.1 140 0.0167 2.08 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.9 160 0.0200 2.87 Shallow Concentrated Flow, Shallow
Paved Kv= 20.3 fps
0.4 138 0.0057 5.44 17.08 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
6.5 488 Total
Subcatchment DET1: Det 1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=176,424 sf
Runoff Volume=50,255 cf
Runoff Depth=3.42"
Flow Length=488'
Tc=6.5 min
CN=68
24.31 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 52HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET2: Det-2
Runoff = 61.54 cfs @ 12.01 hrs, Volume= 141,159 cf, Depth= 3.42"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (sf) CN Description
495,548 68 1 acre lots, 20% imp, HSG B
396,438 80.00% Pervious Area
99,110 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.5 80 0.2000 0.30 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
2.0 270 0.0200 2.28 Shallow Concentrated Flow, Swale
Unpaved Kv= 16.1 fps
1.0 154 0.0162 2.58 Shallow Concentrated Flow, Gutter
Paved Kv= 20.3 fps
1.5 944 0.0200 10.18 31.99 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
0.3 100 0.0100 5.13 89.27 Channel Flow, Swale
Area= 17.4 sf Perim= 13.1' r= 1.33' n= 0.035
9.3 1,548 Total
Subcatchment DET2: Det-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)65
60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=495,548 sf
Runoff Volume=141,159 cf
Runoff Depth=3.42"
Flow Length=1,548'
Tc=9.3 min
CN=68
61.54 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 53HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET3: Det 3
Runoff = 35.73 cfs @ 12.02 hrs, Volume= 87,280 cf, Depth= 4.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (sf) CN Description
228,009 79 1 acre lots, 20% imp, HSG C
182,407 80.00% Pervious Area
45,602 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.2 118 0.1360 0.27 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
1.1 136 0.0150 1.97 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.8 96 0.0100 2.03 Shallow Concentrated Flow, Shallow
Paved Kv= 20.3 fps
1.4 586 0.0100 7.20 22.62 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
10.5 936 Total
Subcatchment DET3: Det 3
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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
50-Year Rainfall=7.01"
Runoff Area=228,009 sf
Runoff Volume=87,280 cf
Runoff Depth=4.59"
Flow Length=936'
Tc=10.5 min
CN=79
35.73 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 54HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-1: DR-1
Runoff = 47.46 cfs @ 11.96 hrs, Volume= 95,887 cf, Depth= 4.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (sf) CN Description
250,493 79 1 acre lots, 20% imp, HSG C
200,394 80.00% Pervious Area
50,099 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DR-1: DR-1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=250,493 sf
Runoff Volume=95,887 cf
Runoff Depth=4.59"
Tc=5.0 min
CN=79
47.46 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 55HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-2: DR-2
Runoff = 30.73 cfs @ 11.96 hrs, Volume= 62,086 cf, Depth= 4.59"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (sf) CN Description
162,192 79 1 acre lots, 20% imp, HSG C
129,754 80.00% Pervious Area
32,438 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DR-2: DR-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=162,192 sf
Runoff Volume=62,086 cf
Runoff Depth=4.59"
Tc=5.0 min
CN=79
30.73 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 56HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-1: Ex WS #1
Runoff = 195.05 cfs @ 12.20 hrs, Volume= 745,495 cf, Depth= 3.01"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (sf) CN Description
1,448,958 70 Woods, Good, HSG C
1,524,134 58 Meadow, non-grazed, HSG B
2,973,092 64 Weighted Average
2,973,092 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
15.0 150 0.0350 0.17 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
6.1 1,162 0.0390 3.18 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
4.2 2,174 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
25.3 3,486 Total
Subcatchment Ex-1: Ex WS #1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)210
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=2,973,092 sf
Runoff Volume=745,495 cf
Runoff Depth=3.01"
Flow Length=3,486'
Tc=25.3 min
CN=64
195.05 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 57HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-2: Ex-2
Runoff = 32.36 cfs @ 12.24 hrs, Volume= 137,310 cf, Depth= 3.63"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (sf) CN Description
454,331 70 Woods, Good, HSG C
454,331 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.7 150 0.0430 0.12 Sheet Flow, Shallow
Woods: Light underbrush n= 0.400 P2= 3.56"
3.8 766 0.0430 3.34 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
2.4 693 0.0300 4.91 19.65 Trap/Vee/Rect Channel Flow, Channel Flow
Bot.W=1.00' D=1.00' Z= 3.0 '/' Top.W=7.00'
n= 0.035 Earth, dense weeds
3.6 1,844 0.0210 8.58 231.62 Channel Flow,
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
30.5 3,453 Total
Subcatchment Ex-2: Ex-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=454,331 sf
Runoff Volume=137,310 cf
Runoff Depth=3.63"
Flow Length=3,453'
Tc=30.5 min
CN=70
32.36 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 58HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-HH: Ex HH
Runoff = 30.09 cfs @ 12.26 hrs, Volume= 129,148 cf, Depth= 3.63"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (sf) CN Description
427,324 70 Woods, Good, HSG C
427,324 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
27.9 148 0.0200 0.09 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
1.8 474 0.0720 4.32 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
1.3 646 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
31.0 1,268 Total
Subcatchment Ex-HH: Ex HH
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=427,324 sf
Runoff Volume=129,148 cf
Runoff Depth=3.63"
Flow Length=1,268'
Tc=31.0 min
CN=70
30.09 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 59HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-PR: (new Subcat)
Runoff = 14.69 cfs @ 11.90 hrs, Volume= 24,030 cf, Depth= 2.42"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 50-Year Rainfall=7.01"
Area (sf) CN Description
119,354 58 Meadow, non-grazed, HSG B
119,354 100.00% Pervious Area
Subcatchment Ex-PR: (new Subcat)
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=119,354 sf
Runoff Volume=24,030 cf
Runoff Depth=2.42"
Tc=0.0 min
CN=58
14.69 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 60HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-1: Det Pond 1
Inflow Area = 176,424 sf, 20.00% Impervious, Inflow Depth = 3.42" for 50-Year event
Inflow = 24.31 cfs @ 11.98 hrs, Volume= 50,255 cf
Outflow = 20.81 cfs @ 12.02 hrs, Volume= 46,505 cf, Atten= 14%, Lag= 2.5 min
Primary = 18.62 cfs @ 12.02 hrs, Volume= 45,875 cf
Secondary = 2.19 cfs @ 12.02 hrs, Volume= 630 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 616.20' @ 12.02 hrs Surf.Area= 5,980 sf Storage= 10,395 cf
Plug-Flow detention time= 65.0 min calculated for 46,505 cf (93% of inflow)
Center-of-Mass det. time= 24.9 min ( 857.4 - 832.5 )
Volume Invert Avail.Storage Storage Description
#1 614.00' 15,561 cf Bio Retention Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
614.00 3,548 0 0
615.00 4,590 4,069 4,069
616.00 5,765 5,178 9,247
617.00 6,864 6,315 15,561
Device Routing Invert Outlet Devices
#1 Primary 610.83'24.0" Round Culvert
L= 45.2' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 610.83' / 610.58' S= 0.0055 '/' Cc= 0.900
n= 0.013, Flow Area= 3.14 sf
#2 Device 1 614.93'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 4.00 4.00
#3 Secondary 616.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=18.61 cfs @ 12.02 hrs HW=616.19' (Free Discharge)
1=Culvert (Passes 18.61 cfs of 31.60 cfs potential flow)
2=Custom Weir/Orifice (Orifice Controls 18.61 cfs @ 3.72 fps)
Secondary OutFlow Max=2.17 cfs @ 12.02 hrs HW=616.19' (Free Discharge)
3=Broad-Crested Rectangular Weir (Weir Controls 2.17 cfs @ 1.12 fps)
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 61HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-1: Det Pond 1
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=176,424 sf
Peak Elev=616.20'
Storage=10,395 cf
24.31 cfs
20.81 cfs
18.62 cfs
2.19 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 62HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-2: Det Pond 2
Inflow Area = 495,548 sf, 20.00% Impervious, Inflow Depth = 3.42" for 50-Year event
Inflow = 61.54 cfs @ 12.01 hrs, Volume= 141,159 cf
Outflow = 56.55 cfs @ 12.05 hrs, Volume= 135,333 cf, Atten= 8%, Lag= 2.1 min
Primary = 56.55 cfs @ 12.05 hrs, Volume= 135,333 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 595.44' @ 12.05 hrs Surf.Area= 9,799 sf Storage= 17,474 cf
Plug-Flow detention time= 37.9 min calculated for 135,318 cf (96% of inflow)
Center-of-Mass det. time= 14.4 min ( 849.4 - 835.1 )
Volume Invert Avail.Storage Storage Description
#1 593.00' 46,534 cf Bio Pond Two (Prismatic) Listed below (Recalc)
Elevation Surf.Area Voids Inc.Store Cum.Store
(feet) (sq-ft) (%) (cubic-feet) (cubic-feet)
593.00 5,313 0.0 0 0
594.00 5,978 100.0 5,646 5,646
595.00 9,284 100.0 7,631 13,277
596.00 10,454 100.0 9,869 23,146
597.00 11,680 100.0 11,067 34,213
598.00 12,963 100.0 12,322 46,534
Device Routing Invert Outlet Devices
#1 Primary 589.83'36.0" Round Culvert
L= 43.8' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 589.83' / 589.33' S= 0.0114 '/' Cc= 0.900
n= 0.013, Flow Area= 7.07 sf
#2 Device 1 594.03'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 10.00 10.00 12.00 12.00
#3 Secondary 597.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=56.48 cfs @ 12.05 hrs HW=595.44' (Free Discharge)
1=Culvert (Passes 56.48 cfs of 68.99 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 56.48 cfs @ 3.79 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=593.00' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 63HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-2: Det Pond 2
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)65
60
55
50
45
40
35
30
25
20
15
10
5
0
Inflow Area=495,548 sf
Peak Elev=595.44'
Storage=17,474 cf
61.54 cfs
56.55 cfs56.55 cfs
0.00 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 64HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-3: Det Pond 3
Inflow Area = 228,009 sf, 20.00% Impervious, Inflow Depth = 4.59" for 50-Year event
Inflow = 35.73 cfs @ 12.02 hrs, Volume= 87,280 cf
Outflow = 30.65 cfs @ 12.07 hrs, Volume= 80,842 cf, Atten= 14%, Lag= 3.2 min
Primary = 30.65 cfs @ 12.07 hrs, Volume= 80,842 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 586.85' @ 12.07 hrs Surf.Area= 10,957 sf Storage= 17,489 cf
Plug-Flow detention time= 69.5 min calculated for 80,842 cf (93% of inflow)
Center-of-Mass det. time= 29.4 min ( 840.9 - 811.4 )
Volume Invert Avail.Storage Storage Description
#1 585.00' 31,098 cf Bio Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
585.00 8,010 0 0
586.00 9,541 8,776 8,776
587.00 11,206 10,374 19,149
588.00 12,692 11,949 31,098
Device Routing Invert Outlet Devices
#1 Primary 581.83'30.0" Round Culvert
L= 33.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 581.83' / 581.58' S= 0.0076 '/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1 585.75'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 8.00 8.00 12.00 12.00
#3 Secondary 587.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=30.62 cfs @ 12.07 hrs HW=586.85' (Free Discharge)
1=Culvert (Passes 30.62 cfs of 45.89 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 30.62 cfs @ 3.33 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=585.00' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 65HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-3: Det Pond 3
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=228,009 sf
Peak Elev=586.85'
Storage=17,489 cf
35.73 cfs
30.65 cfs30.65 cfs
0.00 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 66HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP1: CP1
Inflow Area = 3,959,851 sf, 7.25% Impervious, Inflow Depth = 3.31" for 50-Year event
Inflow = 249.95 cfs @ 12.05 hrs, Volume= 1,091,320 cf
Primary = 249.95 cfs @ 12.05 hrs, Volume= 1,091,320 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP1: CP1
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)260
240
220
200
180
160
140
120
100
80
60
40
20
0
Inflow Area=3,959,851 sf
249.95 cfs249.95 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 67HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP3: Culvert
Inflow Area = 3,569,650 sf, 5.86% Impervious, Inflow Depth = 3.19" for 50-Year event
Inflow = 213.97 cfs @ 12.14 hrs, Volume= 948,391 cf
Primary = 213.97 cfs @ 12.14 hrs, Volume= 948,391 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP3: Culvert
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)230
220
210
200
190
180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=3,569,650 sf
213.97 cfs213.97 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS1_Detention R
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Page 68HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link XCP1: XCP1
Inflow Area = 3,854,747 sf, 0.00% Impervious, Inflow Depth = 3.15" for 50-Year event
Inflow = 255.38 cfs @ 12.20 hrs, Volume= 1,011,954 cf
Primary = 255.38 cfs @ 12.20 hrs, Volume= 1,011,954 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link XCP1: XCP1
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
Inflow Area=3,854,747 sf
255.38 cfs255.38 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 69HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-1: BP-1
Runoff = 55.85 cfs @ 12.24 hrs, Volume= 234,956 cf, Depth= 4.12"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (ac) CN Description
10.308 70 Woods, Good, HSG C
2.590 58 Meadow, non-grazed, HSG B
2.820 68 1 acre lots, 20% imp, HSG B
15.718 68 Weighted Average
15.154 96.41% Pervious Area
0.564 3.59% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.7 150 0.0430 0.12 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
3.8 766 0.0430 3.34 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.7 199 0.0300 4.91 19.65 Trap/Vee/Rect Channel Flow, Channel
Bot.W=1.00' D=1.00' Z= 3.0 '/' Top.W=7.00'
n= 0.035
0.9 492 0.0103 9.58 67.69 Pipe Channel, Culvert
36.0" Round Area= 7.1 sf Perim= 9.4' r= 0.75'
n= 0.013
0.2 82 0.0200 7.26 126.24 Channel Flow, Channel 1
Area= 17.4 sf Perim= 13.1' r= 1.33' n= 0.035
3.8 1,965 0.0210 8.58 231.62 Channel Flow, Main Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
30.1 3,654 Total
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
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Page 70HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Subcatchment BP-1: BP-1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
100-Year Rainfall=7.86"
Runoff Area=15.718 ac
Runoff Volume=234,956 cf
Runoff Depth=4.12"
Flow Length=3,654'
Tc=30.1 min
CN=68
55.85 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 71HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-2: BP-2
Runoff = 153.13 cfs @ 12.20 hrs, Volume= 582,036 cf, Depth= 3.56"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (ac) CN Description
18.072 70 Woods, Good, HSG C
26.981 58 Meadow, non-grazed, HSG B
45.053 63 Weighted Average
45.053 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
15.0 150 0.0350 0.17 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
6.1 1,162 0.0390 3.18 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
4.2 2,174 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
25.3 3,486 Total
Subcatchment BP-2: BP-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Type II 24-hr
100-Year Rainfall=7.86"
Runoff Area=45.053 ac
Runoff Volume=582,036 cf
Runoff Depth=3.56"
Flow Length=3,486'
Tc=25.3 min
CN=63
153.13 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
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Page 72HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-4: Basin T
Runoff = 8.53 cfs @ 12.12 hrs, Volume= 27,591 cf, Depth= 3.01"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (sf) CN Description
109,957 58 Meadow, non-grazed, HSG B
109,957 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
12.9 150 0.0510 0.19 Sheet Flow,
Grass: Dense n= 0.240 P2= 3.56"
6.0 1,003 0.0300 2.79 Shallow Concentrated Flow,
Unpaved Kv= 16.1 fps
18.9 1,153 Total
Subcatchment BP-4: Basin T
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)9
8
7
6
5
4
3
2
1
0
Type II 24-hr
100-Year Rainfall=7.86"
Runoff Area=109,957 sf
Runoff Volume=27,591 cf
Runoff Depth=3.01"
Flow Length=1,153'
Tc=18.9 min
CN=58
8.53 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 73HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET1: Det 1
Runoff = 29.18 cfs @ 11.98 hrs, Volume= 60,542 cf, Depth= 4.12"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (sf) CN Description
* 176,424 68 1 acre lots, 20% imp, HSG B
141,139 80.00% Pervious Area
35,285 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.1 50 0.1000 0.20 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
1.1 140 0.0167 2.08 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.9 160 0.0200 2.87 Shallow Concentrated Flow, Shallow
Paved Kv= 20.3 fps
0.4 138 0.0057 5.44 17.08 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
6.5 488 Total
Subcatchment DET1: Det 1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Type II 24-hr
100-Year Rainfall=7.86"
Runoff Area=176,424 sf
Runoff Volume=60,542 cf
Runoff Depth=4.12"
Flow Length=488'
Tc=6.5 min
CN=68
29.18 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
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Page 74HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET2: Det-2
Runoff = 74.00 cfs @ 12.01 hrs, Volume= 170,054 cf, Depth= 4.12"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (sf) CN Description
495,548 68 1 acre lots, 20% imp, HSG B
396,438 80.00% Pervious Area
99,110 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
4.5 80 0.2000 0.30 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
2.0 270 0.0200 2.28 Shallow Concentrated Flow, Swale
Unpaved Kv= 16.1 fps
1.0 154 0.0162 2.58 Shallow Concentrated Flow, Gutter
Paved Kv= 20.3 fps
1.5 944 0.0200 10.18 31.99 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
0.3 100 0.0100 5.13 89.27 Channel Flow, Swale
Area= 17.4 sf Perim= 13.1' r= 1.33' n= 0.035
9.3 1,548 Total
Subcatchment DET2: Det-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
100-Year Rainfall=7.86"
Runoff Area=495,548 sf
Runoff Volume=170,054 cf
Runoff Depth=4.12"
Flow Length=1,548'
Tc=9.3 min
CN=68
74.00 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
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Page 75HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET3: Det 3
Runoff = 41.54 cfs @ 12.02 hrs, Volume= 102,180 cf, Depth= 5.38"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (sf) CN Description
228,009 79 1 acre lots, 20% imp, HSG C
182,407 80.00% Pervious Area
45,602 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
7.2 118 0.1360 0.27 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
1.1 136 0.0150 1.97 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
0.8 96 0.0100 2.03 Shallow Concentrated Flow, Shallow
Paved Kv= 20.3 fps
1.4 586 0.0100 7.20 22.62 Pipe Channel, Storm Sewer
24.0" Round Area= 3.1 sf Perim= 6.3' r= 0.50'
n= 0.013
10.5 936 Total
Subcatchment DET3: Det 3
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)46
44
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=7.86"
Runoff Area=228,009 sf
Runoff Volume=102,180 cf
Runoff Depth=5.38"
Flow Length=936'
Tc=10.5 min
CN=79
41.54 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 76HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-1: DR-1
Runoff = 55.08 cfs @ 11.96 hrs, Volume= 112,256 cf, Depth= 5.38"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (sf) CN Description
250,493 79 1 acre lots, 20% imp, HSG C
200,394 80.00% Pervious Area
50,099 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DR-1: DR-1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
100-Year Rainfall=7.86"
Runoff Area=250,493 sf
Runoff Volume=112,256 cf
Runoff Depth=5.38"
Tc=5.0 min
CN=79
55.08 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 77HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-2: DR-2
Runoff = 35.66 cfs @ 11.96 hrs, Volume= 72,685 cf, Depth= 5.38"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (sf) CN Description
162,192 79 1 acre lots, 20% imp, HSG C
129,754 80.00% Pervious Area
32,438 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
Subcatchment DR-2: DR-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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=7.86"
Runoff Area=162,192 sf
Runoff Volume=72,685 cf
Runoff Depth=5.38"
Tc=5.0 min
CN=79
35.66 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 78HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-1: Ex WS #1
Runoff = 239.75 cfs @ 12.19 hrs, Volume= 909,251 cf, Depth= 3.67"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (sf) CN Description
1,448,958 70 Woods, Good, HSG C
1,524,134 58 Meadow, non-grazed, HSG B
2,973,092 64 Weighted Average
2,973,092 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
15.0 150 0.0350 0.17 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
6.1 1,162 0.0390 3.18 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
4.2 2,174 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
25.3 3,486 Total
Subcatchment Ex-1: Ex WS #1
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)260
240
220
200
180
160
140
120
100
80
60
40
20
0
Type II 24-hr
100-Year Rainfall=7.86"
Runoff Area=2,973,092 sf
Runoff Volume=909,251 cf
Runoff Depth=3.67"
Flow Length=3,486'
Tc=25.3 min
CN=64
239.75 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
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Page 79HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-2: Ex-2
Runoff = 38.91 cfs @ 12.24 hrs, Volume= 164,476 cf, Depth= 4.34"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (sf) CN Description
454,331 70 Woods, Good, HSG C
454,331 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
20.7 150 0.0430 0.12 Sheet Flow, Shallow
Woods: Light underbrush n= 0.400 P2= 3.56"
3.8 766 0.0430 3.34 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
2.4 693 0.0300 4.91 19.65 Trap/Vee/Rect Channel Flow, Channel Flow
Bot.W=1.00' D=1.00' Z= 3.0 '/' Top.W=7.00'
n= 0.035 Earth, dense weeds
3.6 1,844 0.0210 8.58 231.62 Channel Flow,
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
30.5 3,453 Total
Subcatchment Ex-2: Ex-2
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (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=7.86"
Runoff Area=454,331 sf
Runoff Volume=164,476 cf
Runoff Depth=4.34"
Flow Length=3,453'
Tc=30.5 min
CN=70
38.91 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
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Page 80HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-HH: Ex HH
Runoff = 36.16 cfs @ 12.26 hrs, Volume= 154,699 cf, Depth= 4.34"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (sf) CN Description
427,324 70 Woods, Good, HSG C
427,324 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
27.9 148 0.0200 0.09 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
1.8 474 0.0720 4.32 Shallow Concentrated Flow, Shallow Conc
Unpaved Kv= 16.1 fps
1.3 646 0.0210 8.58 231.62 Channel Flow, Ex Channel
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
31.0 1,268 Total
Subcatchment Ex-HH: Ex HH
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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=7.86"
Runoff Area=427,324 sf
Runoff Volume=154,699 cf
Runoff Depth=4.34"
Flow Length=1,268'
Tc=31.0 min
CN=70
36.16 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
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Page 81HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-PR: (new Subcat)
Runoff = 18.32 cfs @ 11.90 hrs, Volume= 29,948 cf, Depth= 3.01"
Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Type II 24-hr 100-Year Rainfall=7.86"
Area (sf) CN Description
119,354 58 Meadow, non-grazed, HSG B
119,354 100.00% Pervious Area
Subcatchment Ex-PR: (new Subcat)
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (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=7.86"
Runoff Area=119,354 sf
Runoff Volume=29,948 cf
Runoff Depth=3.01"
Tc=0.0 min
CN=58
18.32 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 82HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-1: Det Pond 1
Inflow Area = 176,424 sf, 20.00% Impervious, Inflow Depth = 4.12" for 100-Year event
Inflow = 29.18 cfs @ 11.98 hrs, Volume= 60,542 cf
Outflow = 25.87 cfs @ 12.02 hrs, Volume= 56,792 cf, Atten= 11%, Lag= 2.2 min
Primary = 20.96 cfs @ 12.02 hrs, Volume= 54,964 cf
Secondary = 4.91 cfs @ 12.02 hrs, Volume= 1,828 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 616.33' @ 12.02 hrs Surf.Area= 6,129 sf Storage= 11,218 cf
Plug-Flow detention time= 57.0 min calculated for 56,792 cf (94% of inflow)
Center-of-Mass det. time= 22.8 min ( 849.9 - 827.1 )
Volume Invert Avail.Storage Storage Description
#1 614.00' 15,561 cf Bio Retention Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
614.00 3,548 0 0
615.00 4,590 4,069 4,069
616.00 5,765 5,178 9,247
617.00 6,864 6,315 15,561
Device Routing Invert Outlet Devices
#1 Primary 610.83'24.0" Round Culvert
L= 45.2' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 610.83' / 610.58' S= 0.0055 '/' Cc= 0.900
n= 0.013, Flow Area= 3.14 sf
#2 Device 1 614.93'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.25
Width (feet) 4.00 4.00
#3 Secondary 616.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=20.94 cfs @ 12.02 hrs HW=616.33' (Free Discharge)
1=Culvert (Passes 20.94 cfs of 32.09 cfs potential flow)
2=Custom Weir/Orifice (Orifice Controls 20.94 cfs @ 4.19 fps)
Secondary OutFlow Max=4.88 cfs @ 12.02 hrs HW=616.33' (Free Discharge)
3=Broad-Crested Rectangular Weir (Weir Controls 4.88 cfs @ 1.48 fps)
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 83HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-1: Det Pond 1
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=176,424 sf
Peak Elev=616.33'
Storage=11,218 cf
29.18 cfs
25.87 cfs
20.96 cfs
4.91 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 84HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-2: Det Pond 2
Inflow Area = 495,548 sf, 20.00% Impervious, Inflow Depth = 4.12" for 100-Year event
Inflow = 74.00 cfs @ 12.01 hrs, Volume= 170,054 cf
Outflow = 68.61 cfs @ 12.04 hrs, Volume= 164,228 cf, Atten= 7%, Lag= 2.0 min
Primary = 68.61 cfs @ 12.04 hrs, Volume= 164,228 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 595.62' @ 12.04 hrs Surf.Area= 10,009 sf Storage= 19,253 cf
Plug-Flow detention time= 33.3 min calculated for 164,228 cf (97% of inflow)
Center-of-Mass det. time= 13.4 min ( 843.1 - 829.7 )
Volume Invert Avail.Storage Storage Description
#1 593.00' 46,534 cf Bio Pond Two (Prismatic) Listed below (Recalc)
Elevation Surf.Area Voids Inc.Store Cum.Store
(feet) (sq-ft) (%) (cubic-feet) (cubic-feet)
593.00 5,313 0.0 0 0
594.00 5,978 100.0 5,646 5,646
595.00 9,284 100.0 7,631 13,277
596.00 10,454 100.0 9,869 23,146
597.00 11,680 100.0 11,067 34,213
598.00 12,963 100.0 12,322 46,534
Device Routing Invert Outlet Devices
#1 Primary 589.83'36.0" Round Culvert
L= 43.8' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 589.83' / 589.33' S= 0.0114 '/' Cc= 0.900
n= 0.013, Flow Area= 7.07 sf
#2 Device 1 594.03'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 10.00 10.00 12.00 12.00
#3 Secondary 597.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=68.51 cfs @ 12.04 hrs HW=595.62' (Free Discharge)
1=Culvert (Passes 68.51 cfs of 70.48 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 68.51 cfs @ 4.02 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=593.00' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 85HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-2: Det Pond 2
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Inflow Area=495,548 sf
Peak Elev=595.62'
Storage=19,253 cf
74.00 cfs
68.61 cfs68.61 cfs
0.00 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 86HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-3: Det Pond 3
Inflow Area = 228,009 sf, 20.00% Impervious, Inflow Depth = 5.38" for 100-Year event
Inflow = 41.54 cfs @ 12.02 hrs, Volume= 102,180 cf
Outflow = 36.36 cfs @ 12.07 hrs, Volume= 95,742 cf, Atten= 12%, Lag= 3.0 min
Primary = 36.36 cfs @ 12.07 hrs, Volume= 95,742 cf
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0 cf
Routing by Stor-Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Peak Elev= 586.96' @ 12.07 hrs Surf.Area= 11,146 sf Storage= 18,749 cf
Plug-Flow detention time= 63.2 min calculated for 95,742 cf (94% of inflow)
Center-of-Mass det. time= 28.0 min ( 834.9 - 807.0 )
Volume Invert Avail.Storage Storage Description
#1 585.00' 31,098 cf Bio Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
(feet) (sq-ft) (cubic-feet) (cubic-feet)
585.00 8,010 0 0
586.00 9,541 8,776 8,776
587.00 11,206 10,374 19,149
588.00 12,692 11,949 31,098
Device Routing Invert Outlet Devices
#1 Primary 581.83'30.0" Round Culvert
L= 33.0' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 581.83' / 581.58' S= 0.0076 '/' Cc= 0.900
n= 0.013, Flow Area= 4.91 sf
#2 Device 1 585.75'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 8.00 8.00 12.00 12.00
#3 Secondary 587.00'10.0' long x 11.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.53 2.59 2.70 2.68 2.67 2.68 2.66 2.64
Primary OutFlow Max=36.33 cfs @ 12.07 hrs HW=586.96' (Free Discharge)
1=Culvert (Passes 36.33 cfs of 46.58 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 36.33 cfs @ 3.44 fps)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=585.00' (Free Discharge)
3=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 87HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-3: Det Pond 3
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
0
Inflow Area=228,009 sf
Peak Elev=586.96'
Storage=18,749 cf
41.54 cfs
36.36 cfs36.36 cfs
0.00 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 88HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP1: CP1
Inflow Area = 3,959,851 sf, 7.25% Impervious, Inflow Depth = 4.00" for 100-Year event
Inflow = 305.36 cfs @ 12.05 hrs, Volume= 1,318,695 cf
Primary = 305.36 cfs @ 12.05 hrs, Volume= 1,318,695 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP1: CP1
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)340
320
300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
Inflow Area=3,959,851 sf
305.36 cfs305.36 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 89HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP3: Culvert
Inflow Area = 3,569,650 sf, 5.86% Impervious, Inflow Depth = 3.87" for 100-Year event
Inflow = 260.68 cfs @ 12.14 hrs, Volume= 1,150,268 cf
Primary = 260.68 cfs @ 12.14 hrs, Volume= 1,150,268 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP3: Culvert
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
Inflow Area=3,569,650 sf
260.68 cfs260.68 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS1_Detention R
Printed 8/15/2017Prepared by Cardno
Page 90HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link XCP1: XCP1
Inflow Area = 3,854,747 sf, 0.00% Impervious, Inflow Depth = 3.82" for 100-Year event
Inflow = 312.43 cfs @ 12.20 hrs, Volume= 1,228,426 cf
Primary = 312.43 cfs @ 12.20 hrs, Volume= 1,228,426 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link XCP1: XCP1
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)340
320
300
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
Inflow Area=3,854,747 sf
312.43 cfs312.43 cfs