HomeMy WebLinkAbout2_Storm_Drainage_Plan_pg 56-78_03-07-2018- F
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THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THE ULTIMATE
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4640 TRUEMAN BLVD
HILLIARD, OH 43026
1-800-733-7473
REV DRW CHK DESCRIPTION
Tool
5
---860-529-8188 |888-892-2694 | WWW.STORMTECH.COM
Detention Retention Water Quality
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Icon Home Apartments - Chamber
Bozeman, Montana
03/01/2017 SH
S
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T
O
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DATE:
PROJECT #:
DRAWN:
CHECKED:
THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THE ULTIMATE
RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS.
4640 TRUEMAN BLVD
HILLIARD, OH 43026
1-800-733-7473
REV DRW CHK DESCRIPTION
Tool
5
---860-529-8188 |888-892-2694 | WWW.STORMTECH.COM
Detention Retention Water Quality
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Icon Home Apartments - Chamber
Bozeman, Montana
03/01/2017 SH
S
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T
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DATE:
PROJECT #:
DRAWN:
CHECKED:
THIS DRAWING HAS BEEN PREPARED BASED ON INFORMATION PROVIDED TO ADS UNDER THE DIRECTION OF THE SITE DESIGN ENGINEER OR OTHER PROJECT REPRESENTATIVE. THE SITE DESIGN ENGINEER SHALL REVIEW THIS DRAWING PRIOR TO CONSTRUCTION. IT IS THE ULTIMATE
RESPONSIBILITY OF THE SITE DESIGN ENGINEER TO ENSURE THAT THE PRODUCT(S) DEPICTED AND ALL ASSOCIATED DETAILS MEET ALL APPLICABLE LAWS, REGULATIONS, AND PROJECT REQUIREMENTS.
4640 TRUEMAN BLVD
HILLIARD, OH 43026
1-800-733-7473
REV DRW CHK DESCRIPTION
Tool
5
---860-529-8188 |888-892-2694 | WWW.STORMTECH.COM
Detention Retention Water Quality
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Icon Home Apartments - Chamber
Bozeman, Montana
03/01/2017 SH
V:17007_02_Storm_Drainage_Plan_030716_SC 12 (03/07/18) SN/jil
Appendix D
PIPE CAPACITIES
Icon Home Apartments
Project #:17007.02
3/7/2018
Standard Single Inlet
Qdesign 1.49 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 12 inches Pipe Diameter
S 0.0022 ft/ft Pipe Slope
R 0.25 ft2 Hydraulic Radius
A 0.7854 ft2 Area
Q100 1.81524 cfs Flow Capacity
Double Inlet to MHA
Qdesign 5.37 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 15 inches Pipe Diameter
S 0.006 ft/ft Pipe Slope
R 0.3125 ft2 Hydraulic Radius
A 1.22719 ft2 Area
Q100 5.43532 cfs Flow Capacity
Double Inlet to MHC
Qdesign 2.98 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 15 inches Pipe Diameter
S 0.0022 ft/ft Pipe Slope
R 0.3125 ft2 Hydraulic Radius
A 1.22719 ft2 Area
Q100 3.29125 cfs Flow Capacity
Double Inlet to MHD
Qdesign 1.99 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 15 inches Pipe Diameter
S 0.0015 ft/ft Pipe Slope
R 0.3125 ft2 Hydraulic Radius
A 1.22719 ft2 Area
Q100 2.71766 cfs Flow Capacity
Storm Drain Pipe Flow From Inlet to Manhole
Icon Home Apartments
Project #:17007.02
3/7/2018
MHA to MHB - Watershed 2
Qdesign 5.37 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 15 inches Pipe Diameter
S 0.012 ft/ft Pipe Slope
R 0.3125 ft2 Hydraulic Radius
A 1.22719 ft2 Area
Q100 7.6867 cfs Flow Capacity
MHB to MHC - Watershed 2 & 1
Qdesign 10.77 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 18 inches Pipe Diameter
S 0.0112 ft/ft Pipe Slope
R 0.375 ft2 Hydraulic Radius
A 1.76715 ft2 Area
Q100 12.0756 cfs Flow Capacity
MHC to Chamber A - Watershed 2 & 1 & 18 & 24
Qdesign 22.9 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 24 inches Pipe Diameter
S 0.009 ft/ft Pipe Slope
R 0.5 ft2 Hydraulic Radius
A 3.1416 ft2 Area
Q100 23.3126 cfs Flow Capacity
Storm Drain Pipe Flow To Chamber A
Icon Home Apartments
Project #:17007.02
3/7/2018
MHD to MHE - Watershed 25 & 26
Qdesign 3.39 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 15 inches Pipe Diameter
S 0.0112 ft/ft Pipe Slope
R 0.3125 ft2 Hydraulic Radius
A 1.22719 ft2 Area
Q100 7.42606 cfs Flow Capacity
MHE to Chamber F - Watershed 25 & 26 & 32
Qdesign 8.67 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 18 inches Pipe Diameter
S 0.0128 ft/ft Pipe Slope
R 0.375 ft2 Hydraulic Radius
A 1.76715 ft2 Area
Q100 12.9093 cfs Flow Capacity
Inlets to Chamber F - Watershed 39
Qdesign 2.28 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 12 inches Pipe Diameter
S 0.0128 ft/ft Pipe Slope
R 0.25 ft2 Hydraulic Radius
A 0.7854 ft2 Area
Q100 4.37852 cfs Flow Capacity
Storm Drain Pipe Flow To Chamber F
Icon Home Apartments
Project #:17007.02
3/7/2018
MHF to Chamber C - Watershed 23 & 27
Qdesign 5.19 cfs Peak Flow
n 0.012 RCP Mannings Roughness Coefficient
d 15 inches Pipe Diameter
S 0.006 ft/ft Pipe Slope
R 0.3125 ft2 Hydraulic Radius
A 1.22719 ft2 Area
Q100 5.43532 cfs Flow Capacity
Storm Drain Pipe Flow To Chamber C
Project: Icon Home Apartments
Project #: 17007.02
Date: 7/25/2017
Design Storm Frequency =25 years
Discharge Rate, d =0.00 cfs
Input values for runoff coefficients from appropriate tables.
Area Area
Runoff
Coefficient
Frequency
Factor
Calculation
Value
A A/(43560 ft2/acre)C Cf C x Cf C' C' x A
(ft2)(Acres)=(C x Cf) < or = 1 (Acres)
20625 0.473 0.9 1.1 0.99 0.99 0.46875
6910 0.159 0.2 1.1 0.22 0.22 0.03489899
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
27535 0.6321 0.5036
Weighted Runoff Coefficient, Cwd SCjAj
SAj
Cwd x Cf x SAj =0.50
Where Cj is the adjusted runoff coefficient for surface type j
and Aj is the area of surface type j
Rainfall Rainfall Peak Flow
Duration, t Intensity, i = Cwd x SAj x i
(min) (in/hr)(ft3/s)
1 10.72 5.40
5 3.83 1.93
10 2.46 1.24
15 1.89 0.95
20 1.58 0.79
25 1.37 0.69
30 1.22 0.61
35 1.10 0.55
40 1.01 0.51
45 0.94 0.47
50 0.88 0.44
55 0.82 0.42
60 0.78 0.39
75 0.68 0.34
90 0.60 0.30
105 0.55 0.27
120 0.50 0.25
150 0.43 0.22
180 0.39 0.19
360 0.25 0.12
720 0.16 0.08
1440 0.10
ft3 5.40 (ft3/s)
3459.64 0.00 3459.64
4440.19 0.00 4440.19
2100.34 0.00 2100.34
2695.63 0.00 2695.63
1815.08 0.00 1815.08
1966.91 0.00 1966.91
1636.51 0.00 1636.51
1729.89 0.00 1729.89
1414.25 0.00 1414.25
1532.54 0.00 1532.54
1324.40 0.00 1324.40
1370.63 0.00 1370.63
1222.17 0.00 1222.17
1275.11 0.00 1275.11
1101.93 0.00 1101.93
1164.81 0.00 1164.81
952.27 0.00 952.27
1031.93 0.00 1031.93
741.98 0.00 741.98
858.59 0.00 858.59
323.88 0.00 323.88
578.12 0.00 578.12
= Cwd x SAj x i x t = d x t = Runoff Volume - Discharge Volume
(ft3) (ft3) (ft3)
= 0.7243 Cwd x Cf =0.80
Runoff Volume Discharge Volume Site Detention
=
Landscape
Totals
Impervious
RATIONAL METHOD FOR PEAK FLOW CALCULATIONS
Post-Project Watershed 1
Surface Type
=
Project: Icon Home Apartments
Project #: 17007.02
Date: 7/25/2017
Design Storm Frequency =25 years
Discharge Rate, d =0.00 cfs
Input values for runoff coefficients from appropriate tables.
Area Area
Runoff
Coefficient
Frequency
Factor
Calculation
Value
A A/(43560 ft2/acre)C Cf C x Cf C' C' x A
(ft2)(Acres)=(C x Cf) < or = 1 (Acres)
20969 0.481 0.9 1.1 0.99 0.99 0.476568182
4840 0.111 0.2 1.1 0.22 0.22 0.024444444
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
25809 0.5925 0.5010
Weighted Runoff Coefficient, Cwd SCjAj
SAj
Cwd x Cf x SAj =0.50
Where Cj is the adjusted runoff coefficient for surface type j
and Aj is the area of surface type j
Rainfall Rainfall Peak Flow
Duration, t Intensity, i = Cwd x SAj x i
(min) (in/hr)(ft3/s)
1 10.72 5.37
5 3.83 1.92
10 2.46 1.23
15 1.89 0.95
20 1.58 0.79
25 1.37 0.68
30 1.22 0.61
35 1.10 0.55
40 1.01 0.51
45 0.94 0.47
50 0.88 0.44
55 0.82 0.41
60 0.78 0.39
75 0.68 0.34
90 0.60 0.30
105 0.55 0.27
120 0.50 0.25
150 0.43 0.22
180 0.39 0.19
360 0.25 0.12
720 0.16 0.08
1440 0.10
ft3 5.37 (ft3/s)
3441.53 0.00 3441.53
4416.94 0.00 4416.94
2089.34 0.00 2089.34
2681.51 0.00 2681.51
1805.58 0.00 1805.58
1956.61 0.00 1956.61
1627.94 0.00 1627.94
1720.84 0.00 1720.84
1406.84 0.00 1406.84
1524.52 0.00 1524.52
1317.47 0.00 1317.47
1363.46 0.00 1363.46
1215.77 0.00 1215.77
1268.43 0.00 1268.43
1096.16 0.00 1096.16
1158.71 0.00 1158.71
947.29 0.00 947.29
1026.53 0.00 1026.53
738.09 0.00 738.09
854.09 0.00 854.09
322.19 0.00 322.19
575.10 0.00 575.10
= Cwd x SAj x i x t = d x t = Runoff Volume - Discharge Volume
(ft3) (ft3) (ft3)
= 0.7687 Cwd x Cf =0.85
Runoff Volume Discharge Volume Site Detention
Landscape
Totals
=
RATIONAL METHOD FOR PEAK FLOW CALCULATIONS
Post-Project Watershed 2
Surface Type
Impervious
=
Project: Icon Home Apartments
Project #: 17007.02
Date: 7/25/2017
Design Storm Frequency =25 years
Discharge Rate, d =0.00 cfs
Input values for runoff coefficients from appropriate tables.
Area Area
Runoff
Coefficient
Frequency
Factor
Calculation
Value
A A/(43560 ft2/acre)C Cf C x Cf C' C' x A
(ft2)(Acres)=(C x Cf) < or = 1 (Acres)
46238 1.061 0.9 1.1 0.99 0.99 1.050863636
15963 0.366 0.2 1.1 0.22 0.22 0.080621212
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
62201 1.4279 1.1315
Weighted Runoff Coefficient, Cwd SCjAj
SAj
Cwd x Cf x SAj =1.13
Where Cj is the adjusted runoff coefficient for surface type j
and Aj is the area of surface type j
Rainfall Rainfall Peak Flow
Duration, t Intensity, i = Cwd x SAj x i
(min) (in/hr)(ft3/s)
1 10.72 12.13
5 3.83 4.33
10 2.46 2.78
15 1.89 2.14
20 1.58 1.78
25 1.37 1.55
30 1.22 1.38
35 1.10 1.25
40 1.01 1.14
45 0.94 1.06
50 0.88 0.99
55 0.82 0.93
60 0.78 0.88
75 0.68 0.77
90 0.60 0.68
105 0.55 0.62
120 0.50 0.57
150 0.43 0.49
180 0.39 0.44
360 0.25 0.28
720 0.16 0.18
1440 0.10
ft3 12.13 (ft3/s)
7772.33 0.00 7772.33
9975.21 0.00 9975.21
4718.56 0.00 4718.56
6055.92 0.00 6055.92
4077.71 0.00 4077.71
4418.80 0.00 4418.80
3676.53 0.00 3676.53
3886.33 0.00 3886.33
3177.21 0.00 3177.21
3442.97 0.00 3442.97
2975.37 0.00 2975.37
3079.23 0.00 3079.23
2745.70 0.00 2745.70
2864.63 0.00 2864.63
2475.57 0.00 2475.57
2616.83 0.00 2616.83
2139.35 0.00 2139.35
2318.30 0.00 2318.30
1666.91 0.00 1666.91
1928.88 0.00 1928.88
727.63 0.00 727.63
1298.79 0.00 1298.79
= Cwd x SAj x i x t = d x t = Runoff Volume - Discharge Volume
(ft3) (ft3) (ft3)
= 0.7204 Cwd x Cf =0.79
Runoff Volume Discharge Volume Site Detention
Landscape
Totals
=
RATIONAL METHOD FOR PEAK FLOW CALCULATIONS
Post-Project Watershed 18 & 24
Surface Type
Impervious
=
Project: Icon Home Apartments
Project #: 17007.02
Date: 7/25/2017
Design Storm Frequency =25 years
Discharge Rate, d =0.00 cfs
Input values for runoff coefficients from appropriate tables.
Area Area
Runoff
Coefficient
Frequency
Factor
Calculation
Value
A A/(43560 ft2/acre)C Cf C x Cf C' C' x A
(ft2)(Acres)=(C x Cf) < or = 1 (Acres)
19950 0.458 0.9 1.1 0.99 0.99 0.453409091
7626 0.175 0.2 1.1 0.22 0.22 0.038515152
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
27576 0.6331 0.4919
Weighted Runoff Coefficient, Cwd SCjAj
SAj
Cwd x Cf x SAj =0.49
Where Cj is the adjusted runoff coefficient for surface type j
and Aj is the area of surface type j
Rainfall Rainfall Peak Flow
Duration, t Intensity, i = Cwd x SAj x i
(min) (in/hr)(ft3/s)
1 10.72 5.27
5 3.83 1.88
10 2.46 1.21
15 1.89 0.93
20 1.58 0.78
25 1.37 0.67
30 1.22 0.60
35 1.10 0.54
40 1.01 0.50
45 0.94 0.46
50 0.88 0.43
55 0.82 0.41
60 0.78 0.38
75 0.68 0.33
90 0.60 0.30
105 0.55 0.27
120 0.50 0.25
150 0.43 0.21
180 0.39 0.19
360 0.25 0.12
720 0.16 0.08
1440 0.10
ft3 5.27 (ft3/s)
3379.10 0.00 3379.10
4336.82 0.00 4336.82
2051.44 0.00 2051.44
2632.87 0.00 2632.87
1772.83 0.00 1772.83
1921.12 0.00 1921.12
1598.41 0.00 1598.41
1689.62 0.00 1689.62
1381.32 0.00 1381.32
1496.87 0.00 1496.87
1293.57 0.00 1293.57
1338.73 0.00 1338.73
1193.72 0.00 1193.72
1245.42 0.00 1245.42
1076.28 0.00 1076.28
1137.69 0.00 1137.69
930.10 0.00 930.10
1007.90 0.00 1007.90
724.70 0.00 724.70
838.60 0.00 838.60
316.34 0.00 316.34
564.66 0.00 564.66
= Cwd x SAj x i x t = d x t = Runoff Volume - Discharge Volume
(ft3) (ft3) (ft3)
= 0.7064 Cwd x Cf =0.78
Runoff Volume Discharge Volume Site Detention
Landscape
Totals
=
RATIONAL METHOD FOR PEAK FLOW CALCULATIONS
Post-Project Watershed 24
Surface Type
Impervious
=
Project: Icon Home Apartments
Project #: 17007.02
Date: 7/25/2017
Design Storm Frequency =25 years
Discharge Rate, d =0.00 cfs
Input values for runoff coefficients from appropriate tables.
Area Area
Runoff
Coefficient
Frequency
Factor
Calculation
Value
A A/(43560 ft2/acre)C Cf C x Cf C' C' x A
(ft2)(Acres)=(C x Cf) < or = 1 (Acres)
12396 0.285 0.9 1.1 0.99 0.99 0.281727273
6888 0.158 0.2 1.1 0.22 0.22 0.034787879
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
19284 0.4427 0.3165
Weighted Runoff Coefficient, Cwd SCjAj
SAj
Cwd x Cf x SAj =0.32
Where Cj is the adjusted runoff coefficient for surface type j
and Aj is the area of surface type j
Rainfall Rainfall Peak Flow
Duration, t Intensity, i = Cwd x SAj x i
(min) (in/hr)(ft3/s)
1 10.72 3.39
5 3.83 1.21
10 2.46 0.78
15 1.89 0.60
20 1.58 0.50
25 1.37 0.43
30 1.22 0.38
35 1.10 0.35
40 1.01 0.32
45 0.94 0.30
50 0.88 0.28
55 0.82 0.26
60 0.78 0.25
75 0.68 0.21
90 0.60 0.19
105 0.55 0.17
120 0.50 0.16
150 0.43 0.14
180 0.39 0.12
360 0.25 0.08
720 0.16 0.05
1440 0.10
ft3 3.39 (ft3/s)
2174.19 0.00 2174.19
2790.41 0.00 2790.41
1319.94 0.00 1319.94
1694.05 0.00 1694.05
1140.68 0.00 1140.68
1236.09 0.00 1236.09
1028.45 0.00 1028.45
1087.14 0.00 1087.14
888.77 0.00 888.77
963.12 0.00 963.12
832.31 0.00 832.31
861.37 0.00 861.37
768.07 0.00 768.07
801.33 0.00 801.33
692.50 0.00 692.50
732.02 0.00 732.02
598.45 0.00 598.45
648.51 0.00 648.51
466.29 0.00 466.29
539.57 0.00 539.57
203.54 0.00 203.54
363.32 0.00 363.32
= Cwd x SAj x i x t = d x t = Runoff Volume - Discharge Volume
(ft3) (ft3) (ft3)
= 0.6500 Cwd x Cf =0.71
Runoff Volume Discharge Volume Site Detention
Landscape
Totals
=
RATIONAL METHOD FOR PEAK FLOW CALCULATIONS
Post-Project Watershed 25 & 26
Surface Type
Impervious
=
Project: Icon Home Apartments
Project #: 17007.02
Date: 7/25/2017
Design Storm Frequency =25 years
Discharge Rate, d =0.00 cfs
Input values for runoff coefficients from appropriate tables.
Area Area
Runoff
Coefficient
Frequency
Factor
Calculation
Value
A A/(43560 ft2/acre)C Cf C x Cf C' C' x A
(ft2)(Acres)=(C x Cf) < or = 1 (Acres)
19415 0.446 0.9 1.1 0.99 0.99 0.44125
10127 0.232 0.2 1.1 0.22 0.22 0.051146465
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
29542 0.6782 0.4924
Weighted Runoff Coefficient, Cwd SCjAj
SAj
Cwd x Cf x SAj =0.49
Where Cj is the adjusted runoff coefficient for surface type j
and Aj is the area of surface type j
Rainfall Rainfall Peak Flow
Duration, t Intensity, i = Cwd x SAj x i
(min) (in/hr)(ft3/s)
1 10.72 5.28
5 3.83 1.88
10 2.46 1.21
15 1.89 0.93
20 1.58 0.78
25 1.37 0.67
30 1.22 0.60
35 1.10 0.54
40 1.01 0.50
45 0.94 0.46
50 0.88 0.43
55 0.82 0.41
60 0.78 0.38
75 0.68 0.33
90 0.60 0.30
105 0.55 0.27
120 0.50 0.25
150 0.43 0.21
180 0.39 0.19
360 0.25 0.12
720 0.16 0.08
1440 0.10
ft3 5.28 (ft3/s)
3382.34 0.00 3382.34
4340.98 0.00 4340.98
2053.41 0.00 2053.41
2635.40 0.00 2635.40
1774.53 0.00 1774.53
1922.96 0.00 1922.96
1599.94 0.00 1599.94
1691.24 0.00 1691.24
1382.65 0.00 1382.65
1498.30 0.00 1498.30
1294.81 0.00 1294.81
1340.01 0.00 1340.01
1194.87 0.00 1194.87
1246.62 0.00 1246.62
1077.31 0.00 1077.31
1138.79 0.00 1138.79
931.00 0.00 931.00
1008.87 0.00 1008.87
725.40 0.00 725.40
839.40 0.00 839.40
316.65 0.00 316.65
565.21 0.00 565.21
= Cwd x SAj x i x t = d x t = Runoff Volume - Discharge Volume
(ft3) (ft3) (ft3)
= 0.6600 Cwd x Cf =0.73
Runoff Volume Discharge Volume Site Detention
Landscape
Totals
=
RATIONAL METHOD FOR PEAK FLOW CALCULATIONS
Post-Project Watershed 32
Surface Type
Impervious
=
Project: Icon Home Apartments
Project #: 17007.02
Date: 7/25/2017
Design Storm Frequency =25 years
Discharge Rate, d =0.00 cfs
Input values for runoff coefficients from appropriate tables.
Area Area
Runoff
Coefficient
Frequency
Factor
Calculation
Value
A A/(43560 ft2/acre)C Cf C x Cf C' C' x A
(ft2)(Acres)=(C x Cf) < or = 1 (Acres)
7088 0.163 0.9 1.1 0.99 0.99 0.161090909
10141 0.233 0.2 1.1 0.22 0.22 0.051217172
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
17229 0.3955 0.2123
Weighted Runoff Coefficient, Cwd SCjAj
SAj
Cwd x Cf x SAj =0.21
Where Cj is the adjusted runoff coefficient for surface type j
and Aj is the area of surface type j
Rainfall Rainfall Peak Flow
Duration, t Intensity, i = Cwd x SAj x i
(min) (in/hr)(ft3/s)
1 10.72 2.28
5 3.83 0.81
10 2.46 0.52
15 1.89 0.40
20 1.58 0.33
25 1.37 0.29
30 1.22 0.26
35 1.10 0.23
40 1.01 0.21
45 0.94 0.20
50 0.88 0.19
55 0.82 0.18
60 0.78 0.17
75 0.68 0.14
90 0.60 0.13
105 0.55 0.12
120 0.50 0.11
150 0.43 0.09
180 0.39 0.08
360 0.25 0.05
720 0.16 0.03
1440 0.10
ft3 2.28 (ft3/s)
1458.37 0.00 1458.37
1871.71 0.00 1871.71
885.38 0.00 885.38
1136.31 0.00 1136.31
765.13 0.00 765.13
829.13 0.00 829.13
689.85 0.00 689.85
729.22 0.00 729.22
596.16 0.00 596.16
646.03 0.00 646.03
558.29 0.00 558.29
577.78 0.00 577.78
515.19 0.00 515.19
537.51 0.00 537.51
464.51 0.00 464.51
491.01 0.00 491.01
401.42 0.00 401.42
435.00 0.00 435.00
312.77 0.00 312.77
361.93 0.00 361.93
136.53 0.00 136.53
243.70 0.00 243.70
= Cwd x SAj x i x t = d x t = Runoff Volume - Discharge Volume
(ft3) (ft3) (ft3)
= 0.4880 Cwd x Cf =0.54
Runoff Volume Discharge Volume Site Detention
Landscape
Totals
=
RATIONAL METHOD FOR PEAK FLOW CALCULATIONS
Post-Project Watershed 39
Surface Type
Impervious
=
Project: Icon Home Apartments
Project #: 17007.02
Date: 7/25/2017
Design Storm Frequency =25 years
Discharge Rate, d =0.00 cfs
Input values for runoff coefficients from appropriate tables.
Area Area
Runoff
Coefficient
Frequency
Factor
Calculation
Value
A A/(43560 ft2/acre)C Cf C x Cf C' C' x A
(ft2)(Acres)=(C x Cf) < or = 1 (Acres)
19442 0.446 0.9 1.1 0.99 0.99 0.441863636
8443 0.194 0.2 1.1 0.22 0.22 0.042641414
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
0 1.1 0.00 0.00 0
27885 0.6402 0.4845
Weighted Runoff Coefficient, Cwd SCjAj
SAj
Cwd x Cf x SAj =0.48
Where Cj is the adjusted runoff coefficient for surface type j
and Aj is the area of surface type j
Rainfall Rainfall Peak Flow
Duration, t Intensity, i = Cwd x SAj x i
(min) (in/hr)(ft3/s)
1 10.72 5.19
5 3.83 1.85
10 2.46 1.19
15 1.89 0.92
20 1.58 0.76
25 1.37 0.66
30 1.22 0.59
35 1.10 0.53
40 1.01 0.49
45 0.94 0.45
50 0.88 0.42
55 0.82 0.40
60 0.78 0.38
75 0.68 0.33
90 0.60 0.29
105 0.55 0.26
120 0.50 0.24
150 0.43 0.21
180 0.39 0.19
360 0.25 0.12
720 0.16 0.08
1440 0.10
ft3 5.19 (ft3/s)
3328.13 0.00 3328.13
4271.41 0.00 4271.41
2020.50 0.00 2020.50
2593.16 0.00 2593.16
1746.09 0.00 1746.09
1892.14 0.00 1892.14
1574.30 0.00 1574.30
1664.14 0.00 1664.14
1360.49 0.00 1360.49
1474.29 0.00 1474.29
1274.06 0.00 1274.06
1318.53 0.00 1318.53
1175.72 0.00 1175.72
1226.64 0.00 1226.64
1060.05 0.00 1060.05
1120.54 0.00 1120.54
916.08 0.00 916.08
992.70 0.00 992.70
713.77 0.00 713.77
825.95 0.00 825.95
311.57 0.00 311.57
556.15 0.00 556.15
= Cwd x SAj x i x t = d x t = Runoff Volume - Discharge Volume
(ft3) (ft3) (ft3)
= 0.6881 Cwd x Cf =0.76
Runoff Volume Discharge Volume Site Detention
Landscape
Totals
=
RATIONAL METHOD FOR PEAK FLOW CALCULATIONS
Post-Project Watershed 23 & 27
Surface Type
Impervious
=