Addington Crossing Subdivision - HydroCAD Report WS2

BP-3 DET-4
Det 4
DR-3
DR-3
Ex-3
Ex WS #3
Ex-4
Ex-4
P-4
Det Pond 4
CP2
CP2
XCP2
XCP2
Routing Diagram for USI Revision WS2-Detention
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 WS2-Detention
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 DET-4 0.00 0.00 333.0 0.0100 0.013 24.0 0.0 0.0
2 P-4 581.83 580.95 58.8 0.0150 0.013 36.0 0.0 0.0
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 3HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-3:
Runoff = 102.87 cfs @ 12.65 hrs, Volume= 737,137 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
2,229,836 55 Woods, Good, HSG B
2,937,251 71 Meadow, non-grazed, HSG C
5,167,087 64 Weighted Average
5,167,087 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.5 232 0.0200 0.15 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
4.9 945 0.0254 3.24 Shallow Concentrated Flow, Shallow Conc
Paved Kv= 20.3 fps
19.7 961 0.0135 0.81 Shallow Concentrated Flow, Shallow
Short Grass Pasture Kv= 7.0 fps
4.5 1,977 0.0156 7.39 199.63 Channel Flow, Ex Channel 1
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
2.2 1,117 0.0210 8.58 231.62 Channel Flow, Ex Channel 2
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
57.8 5,232 Total
Subcatchment BP-3:
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=5,167,087 sf
Runoff Volume=737,137 cf
Runoff Depth=1.71"
Flow Length=5,232'
Tc=57.8 min
CN=64
102.87 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 4HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET-4: Det 4
Runoff = 40.89 cfs @ 12.04 hrs, Volume= 103,287 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
612,612 68 1 acre lots, 20% imp, HSG B
490,090 80.00% Pervious Area
122,522 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
9.0 150 0.0367 0.28 Sheet Flow, Sheet
Range n= 0.130 P2= 3.56"
1.2 213 0.0367 2.87 Shallow Concentrated Flow, Shallow
Grassed Waterway Kv= 15.0 fps
0.7 131 0.0381 2.93 Shallow Concentrated Flow, Shallow
Grassed Waterway Kv= 15.0 fps
0.8 333 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
11.7 827 Total
Subcatchment DET-4: Det 4
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
10-Year Rainfall=5.20"
Runoff Area=612,612 sf
Runoff Volume=103,287 cf
Runoff Depth=2.02"
Flow Length=827'
Tc=11.7 min
CN=68
40.89 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 5HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-3: DR-3
Runoff = 30.75 cfs @ 11.97 hrs, Volume= 59,943 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
355,530 68 1 acre lots, 20% imp, HSG B
284,424 80.00% Pervious Area
71,106 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, Direct
Subcatchment DR-3: DR-3
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=355,530 sf
Runoff Volume=59,943 cf
Runoff Depth=2.02"
Tc=5.0 min
CN=68
30.75 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 6HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-3: Ex WS #3
Runoff = 96.35 cfs @ 12.65 hrs, Volume= 703,872 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
62.220 55 Woods, Good, HSG B
56.230 71 Meadow, non-grazed, HSG C
118.450 63 Weighted Average
118.450 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.5 232 0.0200 0.15 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
4.9 945 0.0254 3.24 Shallow Concentrated Flow, Shallow Conc
Paved Kv= 20.3 fps
19.7 961 0.0135 0.81 Shallow Concentrated Flow, Shallow
Short Grass Pasture Kv= 7.0 fps
4.5 1,977 0.0156 7.39 199.63 Channel Flow, Ex Channel 1
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
2.5 1,117 0.0156 7.39 199.63 Channel Flow, Ex Channel 2
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
58.1 5,232 Total
Subcatchment Ex-3: Ex WS #3
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
10-Year Rainfall=5.20"
Runoff Area=118.450 ac
Runoff Volume=703,872 cf
Runoff Depth=1.64"
Flow Length=5,232'
Tc=58.1 min
CN=63
96.35 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 7HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-4: Ex-4
Runoff = 14.43 cfs @ 12.41 hrs, Volume= 91,449 cf, Depth= 1.08"
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
1,014,948 55 Woods, Good, HSG B
1,014,948 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
28.2 150 0.0200 0.09 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
5.0 921 0.0370 3.10 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
6.0 2,650 0.0250 7.41 251.86 Trap/Vee/Rect Channel Flow,
Bot.W=5.00' D=2.00' Z= 6.0 '/' Top.W=29.00'
n= 0.035 Earth, dense weeds
39.2 3,721 Total
Subcatchment Ex-4: Ex-4
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=1,014,948 sf
Runoff Volume=91,449 cf
Runoff Depth=1.08"
Flow Length=3,721'
Tc=39.2 min
CN=55
14.43 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 8HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-4: Det Pond 4
Inflow Area = 612,612 sf, 20.00% Impervious, Inflow Depth = 2.02" for 10-Year event
Inflow = 40.89 cfs @ 12.04 hrs, Volume= 103,287 cf
Outflow = 36.74 cfs @ 12.09 hrs, Volume= 95,642 cf, Atten= 10%, Lag= 2.7 min
Primary = 36.74 cfs @ 12.09 hrs, Volume= 95,642 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= 586.94' @ 12.09 hrs Surf.Area= 10,274 sf Storage= 16,625 cf
Plug-Flow detention time= 60.3 min calculated for 95,642 cf (93% of inflow)
Center-of-Mass det. time= 20.7 min ( 873.3 - 852.6 )
Volume Invert Avail.Storage Storage Description
#1 585.00' 40,551 cf Bio Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Voids Inc.Store Cum.Store
(feet) (sq-ft) (%) (cubic-feet) (cubic-feet)
585.00 7,081 0.0 0 0
586.00 8,551 100.0 7,816 7,816
587.00 10,392 100.0 9,472 17,288
588.00 11,617 100.0 11,005 28,292
589.00 12,900 100.0 12,259 40,551
Device Routing Invert Outlet Devices
#1 Primary 581.83'36.0" Round Culvert
L= 58.8' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 581.83' / 580.95' S= 0.0150 '/' Cc= 0.900
n= 0.013, Flow Area= 7.07 sf
#2 Device 1 585.98'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 12.00 12.00 12.00 12.00
#3 Secondary 588.00'10.0' 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=36.69 cfs @ 12.09 hrs HW=586.94' (Free Discharge)
1=Culvert (Passes 36.69 cfs of 64.62 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 36.69 cfs @ 3.20 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 WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 9HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-4: Det Pond 4
Inflow
Outflow
Primary
Secondary
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
Inflow Area=612,612 sf
Peak Elev=586.94'
Storage=16,625 cf
40.89 cfs
36.74 cfs36.74 cfs
0.00 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 10HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP2: CP2
Inflow Area = 6,135,229 sf, 3.16% Impervious, Inflow Depth = 1.75" for 10-Year event
Inflow = 110.30 cfs @ 12.65 hrs, Volume= 892,722 cf
Primary = 110.30 cfs @ 12.65 hrs, Volume= 892,722 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP2: CP2
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)120
115
110
105
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Inflow Area=6,135,229 sf
110.30 cfs110.30 cfs
Type II 24-hr 10-Year Rainfall=5.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 11HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link XCP2: XCP2
Inflow Area = 6,174,630 sf, 0.00% Impervious, Inflow Depth = 1.55" for 10-Year event
Inflow = 108.18 cfs @ 12.59 hrs, Volume= 795,321 cf
Primary = 108.18 cfs @ 12.59 hrs, Volume= 795,321 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link XCP2: XCP2
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)120
115
110
105
100
95
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Inflow Area=6,174,630 sf
108.18 cfs108.18 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 12HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-3:
Runoff = 149.78 cfs @ 12.65 hrs, Volume= 1,036,461 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
2,229,836 55 Woods, Good, HSG B
2,937,251 71 Meadow, non-grazed, HSG C
5,167,087 64 Weighted Average
5,167,087 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.5 232 0.0200 0.15 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
4.9 945 0.0254 3.24 Shallow Concentrated Flow, Shallow Conc
Paved Kv= 20.3 fps
19.7 961 0.0135 0.81 Shallow Concentrated Flow, Shallow
Short Grass Pasture Kv= 7.0 fps
4.5 1,977 0.0156 7.39 199.63 Channel Flow, Ex Channel 1
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
2.2 1,117 0.0210 8.58 231.62 Channel Flow, Ex Channel 2
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
57.8 5,232 Total
Subcatchment BP-3:
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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=5,167,087 sf
Runoff Volume=1,036,461 cf
Runoff Depth=2.41"
Flow Length=5,232'
Tc=57.8 min
CN=64
149.78 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 13HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET-4: Det 4
Runoff = 56.52 cfs @ 12.04 hrs, Volume= 141,683 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
612,612 68 1 acre lots, 20% imp, HSG B
490,090 80.00% Pervious Area
122,522 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
9.0 150 0.0367 0.28 Sheet Flow, Sheet
Range n= 0.130 P2= 3.56"
1.2 213 0.0367 2.87 Shallow Concentrated Flow, Shallow
Grassed Waterway Kv= 15.0 fps
0.7 131 0.0381 2.93 Shallow Concentrated Flow, Shallow
Grassed Waterway Kv= 15.0 fps
0.8 333 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
11.7 827 Total
Subcatchment DET-4: Det 4
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
25-Year Rainfall=6.20"
Runoff Area=612,612 sf
Runoff Volume=141,683 cf
Runoff Depth=2.78"
Flow Length=827'
Tc=11.7 min
CN=68
56.52 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 14HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-3: DR-3
Runoff = 42.17 cfs @ 11.96 hrs, Volume= 82,226 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
355,530 68 1 acre lots, 20% imp, HSG B
284,424 80.00% Pervious Area
71,106 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, Direct
Subcatchment DR-3: DR-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
25-Year Rainfall=6.20"
Runoff Area=355,530 sf
Runoff Volume=82,226 cf
Runoff Depth=2.78"
Tc=5.0 min
CN=68
42.17 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 15HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-3: Ex WS #3
Runoff = 141.96 cfs @ 12.60 hrs, Volume= 996,367 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
62.220 55 Woods, Good, HSG B
56.230 71 Meadow, non-grazed, HSG C
118.450 63 Weighted Average
118.450 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.5 232 0.0200 0.15 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
4.9 945 0.0254 3.24 Shallow Concentrated Flow, Shallow Conc
Paved Kv= 20.3 fps
19.7 961 0.0135 0.81 Shallow Concentrated Flow, Shallow
Short Grass Pasture Kv= 7.0 fps
4.5 1,977 0.0156 7.39 199.63 Channel Flow, Ex Channel 1
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
2.5 1,117 0.0156 7.39 199.63 Channel Flow, Ex Channel 2
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
58.1 5,232 Total
Subcatchment Ex-3: Ex WS #3
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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=118.450 ac
Runoff Volume=996,367 cf
Runoff Depth=2.32"
Flow Length=5,232'
Tc=58.1 min
CN=63
141.96 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 16HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-4: Ex-4
Runoff = 23.98 cfs @ 12.41 hrs, Volume= 138,207 cf, Depth= 1.63"
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 25-Year Rainfall=6.20"
Area (sf) CN Description
1,014,948 55 Woods, Good, HSG B
1,014,948 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
28.2 150 0.0200 0.09 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
5.0 921 0.0370 3.10 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
6.0 2,650 0.0250 7.41 251.86 Trap/Vee/Rect Channel Flow,
Bot.W=5.00' D=2.00' Z= 6.0 '/' Top.W=29.00'
n= 0.035 Earth, dense weeds
39.2 3,721 Total
Subcatchment Ex-4: Ex-4
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=1,014,948 sf
Runoff Volume=138,207 cf
Runoff Depth=1.63"
Flow Length=3,721'
Tc=39.2 min
CN=55
23.98 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 17HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-4: Det Pond 4
Inflow Area = 612,612 sf, 20.00% Impervious, Inflow Depth = 2.78" for 25-Year event
Inflow = 56.52 cfs @ 12.04 hrs, Volume= 141,683 cf
Outflow = 52.07 cfs @ 12.08 hrs, Volume= 134,037 cf, Atten= 8%, Lag= 2.4 min
Primary = 52.07 cfs @ 12.08 hrs, Volume= 134,037 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= 587.19' @ 12.08 hrs Surf.Area= 10,620 sf Storage= 19,244 cf
Plug-Flow detention time= 47.0 min calculated for 134,024 cf (95% of inflow)
Center-of-Mass det. time= 17.0 min ( 860.3 - 843.3 )
Volume Invert Avail.Storage Storage Description
#1 585.00' 40,551 cf Bio Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Voids Inc.Store Cum.Store
(feet) (sq-ft) (%) (cubic-feet) (cubic-feet)
585.00 7,081 0.0 0 0
586.00 8,551 100.0 7,816 7,816
587.00 10,392 100.0 9,472 17,288
588.00 11,617 100.0 11,005 28,292
589.00 12,900 100.0 12,259 40,551
Device Routing Invert Outlet Devices
#1 Primary 581.83'36.0" Round Culvert
L= 58.8' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 581.83' / 580.95' S= 0.0150 '/' Cc= 0.900
n= 0.013, Flow Area= 7.07 sf
#2 Device 1 585.98'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 12.00 12.00 12.00 12.00
#3 Secondary 588.00'10.0' 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=52.04 cfs @ 12.08 hrs HW=587.19' (Free Discharge)
1=Culvert (Passes 52.04 cfs of 66.83 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 52.04 cfs @ 3.60 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 WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 18HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-4: Det Pond 4
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)60
55
50
45
40
35
30
25
20
15
10
5
0
Inflow Area=612,612 sf
Peak Elev=587.19'
Storage=19,244 cf
56.52 cfs
52.07 cfs52.07 cfs
0.00 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 19HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP2: CP2
Inflow Area = 6,135,229 sf, 3.16% Impervious, Inflow Depth = 2.45" for 25-Year event
Inflow = 159.65 cfs @ 12.59 hrs, Volume= 1,252,724 cf
Primary = 159.65 cfs @ 12.59 hrs, Volume= 1,252,724 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP2: CP2
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=6,135,229 sf
159.65 cfs159.65 cfs
Type II 24-hr 25-Year Rainfall=6.20"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 20HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link XCP2: XCP2
Inflow Area = 6,174,630 sf, 0.00% Impervious, Inflow Depth = 2.20" for 25-Year event
Inflow = 161.70 cfs @ 12.59 hrs, Volume= 1,134,573 cf
Primary = 161.70 cfs @ 12.59 hrs, Volume= 1,134,573 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link XCP2: XCP2
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)180
170
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
Inflow Area=6,174,630 sf
161.70 cfs161.70 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 21HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-3:
Runoff = 190.21 cfs @ 12.65 hrs, Volume= 1,295,633 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
2,229,836 55 Woods, Good, HSG B
2,937,251 71 Meadow, non-grazed, HSG C
5,167,087 64 Weighted Average
5,167,087 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.5 232 0.0200 0.15 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
4.9 945 0.0254 3.24 Shallow Concentrated Flow, Shallow Conc
Paved Kv= 20.3 fps
19.7 961 0.0135 0.81 Shallow Concentrated Flow, Shallow
Short Grass Pasture Kv= 7.0 fps
4.5 1,977 0.0156 7.39 199.63 Channel Flow, Ex Channel 1
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
2.2 1,117 0.0210 8.58 231.62 Channel Flow, Ex Channel 2
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
57.8 5,232 Total
Subcatchment BP-3:
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=5,167,087 sf
Runoff Volume=1,295,633 cf
Runoff Depth=3.01"
Flow Length=5,232'
Tc=57.8 min
CN=64
190.21 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 22HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET-4: Det 4
Runoff = 69.73 cfs @ 12.04 hrs, Volume= 174,505 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
612,612 68 1 acre lots, 20% imp, HSG B
490,090 80.00% Pervious Area
122,522 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
9.0 150 0.0367 0.28 Sheet Flow, Sheet
Range n= 0.130 P2= 3.56"
1.2 213 0.0367 2.87 Shallow Concentrated Flow, Shallow
Grassed Waterway Kv= 15.0 fps
0.7 131 0.0381 2.93 Shallow Concentrated Flow, Shallow
Grassed Waterway Kv= 15.0 fps
0.8 333 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
11.7 827 Total
Subcatchment DET-4: Det 4
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)75
70
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=612,612 sf
Runoff Volume=174,505 cf
Runoff Depth=3.42"
Flow Length=827'
Tc=11.7 min
CN=68
69.73 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 23HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-3: DR-3
Runoff = 51.78 cfs @ 11.96 hrs, Volume= 101,274 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
355,530 68 1 acre lots, 20% imp, HSG B
284,424 80.00% Pervious Area
71,106 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, Direct
Subcatchment DR-3: DR-3
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
50-Year Rainfall=7.01"
Runoff Area=355,530 sf
Runoff Volume=101,274 cf
Runoff Depth=3.42"
Tc=5.0 min
CN=68
51.78 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 24HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-3: Ex WS #3
Runoff = 182.01 cfs @ 12.59 hrs, Volume= 1,250,502 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
62.220 55 Woods, Good, HSG B
56.230 71 Meadow, non-grazed, HSG C
118.450 63 Weighted Average
118.450 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.5 232 0.0200 0.15 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
4.9 945 0.0254 3.24 Shallow Concentrated Flow, Shallow Conc
Paved Kv= 20.3 fps
19.7 961 0.0135 0.81 Shallow Concentrated Flow, Shallow
Short Grass Pasture Kv= 7.0 fps
4.5 1,977 0.0156 7.39 199.63 Channel Flow, Ex Channel 1
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
2.5 1,117 0.0156 7.39 199.63 Channel Flow, Ex Channel 2
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
58.1 5,232 Total
Subcatchment Ex-3: Ex WS #3
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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=118.450 ac
Runoff Volume=1,250,502 cf
Runoff Depth=2.91"
Flow Length=5,232'
Tc=58.1 min
CN=63
182.01 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 25HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-4: Ex-4
Runoff = 32.62 cfs @ 12.41 hrs, Volume= 180,171 cf, Depth= 2.13"
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
1,014,948 55 Woods, Good, HSG B
1,014,948 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
28.2 150 0.0200 0.09 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
5.0 921 0.0370 3.10 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
6.0 2,650 0.0250 7.41 251.86 Trap/Vee/Rect Channel Flow,
Bot.W=5.00' D=2.00' Z= 6.0 '/' Top.W=29.00'
n= 0.035 Earth, dense weeds
39.2 3,721 Total
Subcatchment Ex-4: Ex-4
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=1,014,948 sf
Runoff Volume=180,171 cf
Runoff Depth=2.13"
Flow Length=3,721'
Tc=39.2 min
CN=55
32.62 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 26HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-4: Det Pond 4
Inflow Area = 612,612 sf, 20.00% Impervious, Inflow Depth = 3.42" for 50-Year event
Inflow = 69.73 cfs @ 12.04 hrs, Volume= 174,505 cf
Outflow = 64.80 cfs @ 12.08 hrs, Volume= 166,860 cf, Atten= 7%, Lag= 2.3 min
Primary = 64.80 cfs @ 12.08 hrs, Volume= 166,860 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= 587.38' @ 12.08 hrs Surf.Area= 10,852 sf Storage= 21,277 cf
Plug-Flow detention time= 40.3 min calculated for 166,842 cf (96% of inflow)
Center-of-Mass det. time= 15.4 min ( 852.7 - 837.3 )
Volume Invert Avail.Storage Storage Description
#1 585.00' 40,551 cf Bio Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Voids Inc.Store Cum.Store
(feet) (sq-ft) (%) (cubic-feet) (cubic-feet)
585.00 7,081 0.0 0 0
586.00 8,551 100.0 7,816 7,816
587.00 10,392 100.0 9,472 17,288
588.00 11,617 100.0 11,005 28,292
589.00 12,900 100.0 12,259 40,551
Device Routing Invert Outlet Devices
#1 Primary 581.83'36.0" Round Culvert
L= 58.8' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 581.83' / 580.95' S= 0.0150 '/' Cc= 0.900
n= 0.013, Flow Area= 7.07 sf
#2 Device 1 585.98'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 12.00 12.00 12.00 12.00
#3 Secondary 588.00'10.0' 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=64.73 cfs @ 12.08 hrs HW=587.37' (Free Discharge)
1=Culvert (Passes 64.73 cfs of 68.45 cfs potential flow)
2=Custom Weir/Orifice (Weir Controls 64.73 cfs @ 3.87 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 WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 27HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-4: Det Pond 4
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Inflow Area=612,612 sf
Peak Elev=587.38'
Storage=21,277 cf
69.73 cfs
64.80 cfs64.80 cfs
0.00 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 28HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP2: CP2
Inflow Area = 6,135,229 sf, 3.16% Impervious, Inflow Depth = 3.06" for 50-Year event
Inflow = 202.45 cfs @ 12.59 hrs, Volume= 1,563,767 cf
Primary = 202.45 cfs @ 12.59 hrs, Volume= 1,563,767 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP2: CP2
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=6,135,229 sf
202.45 cfs202.45 cfs
Type II 24-hr 50-Year Rainfall=7.01"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 29HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link XCP2: XCP2
Inflow Area = 6,174,630 sf, 0.00% Impervious, Inflow Depth = 2.78" for 50-Year event
Inflow = 208.34 cfs @ 12.59 hrs, Volume= 1,430,673 cf
Primary = 208.34 cfs @ 12.59 hrs, Volume= 1,430,673 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link XCP2: XCP2
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=6,174,630 sf
208.34 cfs208.34 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 30HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment BP-3:
Runoff = 234.32 cfs @ 12.64 hrs, Volume= 1,580,233 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
2,229,836 55 Woods, Good, HSG B
2,937,251 71 Meadow, non-grazed, HSG C
5,167,087 64 Weighted Average
5,167,087 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.5 232 0.0200 0.15 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
4.9 945 0.0254 3.24 Shallow Concentrated Flow, Shallow Conc
Paved Kv= 20.3 fps
19.7 961 0.0135 0.81 Shallow Concentrated Flow, Shallow
Short Grass Pasture Kv= 7.0 fps
4.5 1,977 0.0156 7.39 199.63 Channel Flow, Ex Channel 1
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
2.2 1,117 0.0210 8.58 231.62 Channel Flow, Ex Channel 2
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
57.8 5,232 Total
Subcatchment BP-3:
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)260
250
240
230
220
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
100-Year Rainfall=7.86"
Runoff Area=5,167,087 sf
Runoff Volume=1,580,233 cf
Runoff Depth=3.67"
Flow Length=5,232'
Tc=57.8 min
CN=64
234.32 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 31HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DET-4: Det 4
Runoff = 83.96 cfs @ 12.04 hrs, Volume= 210,226 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
612,612 68 1 acre lots, 20% imp, HSG B
490,090 80.00% Pervious Area
122,522 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
9.0 150 0.0367 0.28 Sheet Flow, Sheet
Range n= 0.130 P2= 3.56"
1.2 213 0.0367 2.87 Shallow Concentrated Flow, Shallow
Grassed Waterway Kv= 15.0 fps
0.7 131 0.0381 2.93 Shallow Concentrated Flow, Shallow
Grassed Waterway Kv= 15.0 fps
0.8 333 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
11.7 827 Total
Subcatchment DET-4: Det 4
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Type II 24-hr
100-Year Rainfall=7.86"
Runoff Area=612,612 sf
Runoff Volume=210,226 cf
Runoff Depth=4.12"
Flow Length=827'
Tc=11.7 min
CN=68
83.96 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 32HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment DR-3: DR-3
Runoff = 62.10 cfs @ 11.96 hrs, Volume= 122,005 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
355,530 68 1 acre lots, 20% imp, HSG B
284,424 80.00% Pervious Area
71,106 20.00% Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry, Direct
Subcatchment DR-3: DR-3
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)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=355,530 sf
Runoff Volume=122,005 cf
Runoff Depth=4.12"
Tc=5.0 min
CN=68
62.10 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 33HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-3: Ex WS #3
Runoff = 225.90 cfs @ 12.59 hrs, Volume= 1,530,246 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
62.220 55 Woods, Good, HSG B
56.230 71 Meadow, non-grazed, HSG C
118.450 63 Weighted Average
118.450 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
26.5 232 0.0200 0.15 Sheet Flow, Sheet
Grass: Dense n= 0.240 P2= 3.56"
4.9 945 0.0254 3.24 Shallow Concentrated Flow, Shallow Conc
Paved Kv= 20.3 fps
19.7 961 0.0135 0.81 Shallow Concentrated Flow, Shallow
Short Grass Pasture Kv= 7.0 fps
4.5 1,977 0.0156 7.39 199.63 Channel Flow, Ex Channel 1
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
2.5 1,117 0.0156 7.39 199.63 Channel Flow, Ex Channel 2
Area= 27.0 sf Perim= 16.4' r= 1.65' n= 0.035
58.1 5,232 Total
Subcatchment Ex-3: Ex WS #3
Runoff
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)250
240
230
220
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
100-Year Rainfall=7.86"
Runoff Area=118.450 ac
Runoff Volume=1,530,246 cf
Runoff Depth=3.56"
Flow Length=5,232'
Tc=58.1 min
CN=63
225.90 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 34HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Subcatchment Ex-4: Ex-4
Runoff = 42.35 cfs @ 12.38 hrs, Volume= 227,418 cf, Depth= 2.69"
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
1,014,948 55 Woods, Good, HSG B
1,014,948 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
28.2 150 0.0200 0.09 Sheet Flow, Sheet
Woods: Light underbrush n= 0.400 P2= 3.56"
5.0 921 0.0370 3.10 Shallow Concentrated Flow, Shallow
Unpaved Kv= 16.1 fps
6.0 2,650 0.0250 7.41 251.86 Trap/Vee/Rect Channel Flow,
Bot.W=5.00' D=2.00' Z= 6.0 '/' Top.W=29.00'
n= 0.035 Earth, dense weeds
39.2 3,721 Total
Subcatchment Ex-4: Ex-4
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=1,014,948 sf
Runoff Volume=227,418 cf
Runoff Depth=2.69"
Flow Length=3,721'
Tc=39.2 min
CN=55
42.35 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 35HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Pond P-4: Det Pond 4
Inflow Area = 612,612 sf, 20.00% Impervious, Inflow Depth = 4.12" for 100-Year event
Inflow = 83.96 cfs @ 12.04 hrs, Volume= 210,226 cf
Outflow = 71.04 cfs @ 12.09 hrs, Volume= 202,581 cf, Atten= 15%, Lag= 3.5 min
Primary = 71.04 cfs @ 12.09 hrs, Volume= 202,581 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= 587.69' @ 12.09 hrs Surf.Area= 11,233 sf Storage= 24,710 cf
Plug-Flow detention time= 35.5 min calculated for 202,581 cf (96% of inflow)
Center-of-Mass det. time= 14.4 min ( 846.3 - 832.0 )
Volume Invert Avail.Storage Storage Description
#1 585.00' 40,551 cf Bio Pond (Prismatic) Listed below (Recalc)
Elevation Surf.Area Voids Inc.Store Cum.Store
(feet) (sq-ft) (%) (cubic-feet) (cubic-feet)
585.00 7,081 0.0 0 0
586.00 8,551 100.0 7,816 7,816
587.00 10,392 100.0 9,472 17,288
588.00 11,617 100.0 11,005 28,292
589.00 12,900 100.0 12,259 40,551
Device Routing Invert Outlet Devices
#1 Primary 581.83'36.0" Round Culvert
L= 58.8' RCP, square edge headwall, Ke= 0.500
Inlet / Outlet Invert= 581.83' / 580.95' S= 0.0150 '/' Cc= 0.900
n= 0.013, Flow Area= 7.07 sf
#2 Device 1 585.98'Custom Weir/Orifice, Cv= 2.62 (C= 3.28)
Head (feet) 0.00 1.00 1.00 2.00
Width (feet) 12.00 12.00 12.00 12.00
#3 Secondary 588.00'10.0' 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=71.03 cfs @ 12.09 hrs HW=587.69' (Free Discharge)
1=Culvert (Inlet Controls 71.03 cfs @ 10.05 fps)
2=Custom Weir/Orifice (Passes 71.03 cfs of 87.50 cfs potential flow)
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 WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 36HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Pond P-4: Det Pond 4
Inflow
Outflow
Primary
Secondary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
Inflow Area=612,612 sf
Peak Elev=587.69'
Storage=24,710 cf
83.96 cfs
71.04 cfs71.04 cfs
0.00 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 37HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link CP2: CP2
Inflow Area = 6,135,229 sf, 3.16% Impervious, Inflow Depth = 3.73" for 100-Year event
Inflow = 249.22 cfs @ 12.59 hrs, Volume= 1,904,819 cf
Primary = 249.22 cfs @ 12.59 hrs, Volume= 1,904,819 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link CP2: CP2
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)260
240
220
200
180
160
140
120
100
80
60
40
20
0
Inflow Area=6,135,229 sf
249.22 cfs249.22 cfs
Type II 24-hr 100-Year Rainfall=7.86"USI Revision WS2-Detention
Printed 8/15/2017Prepared by Cardno
Page 38HydroCAD® 10.00-19 s/n 08568 © 2016 HydroCAD Software Solutions LLC
Summary for Link XCP2: XCP2
Inflow Area = 6,174,630 sf, 0.00% Impervious, Inflow Depth = 3.42" for 100-Year event
Inflow = 259.65 cfs @ 12.59 hrs, Volume= 1,757,664 cf
Primary = 259.65 cfs @ 12.59 hrs, Volume= 1,757,664 cf, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs
Link XCP2: XCP2
Inflow
Primary
Hydrograph
Time (hours)
95908580757065605550454035302520151050Flow (cfs)280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
Inflow Area=6,174,630 sf
259.65 cfs259.65 cfs