SW6220904_Design Calculations_20221102

[CALCULATIONS
sheet only set up to handle Tc from 5 min to 30 min
A. Flow velocity < 2.0 fps when discharging to wetlands B. Flow velocity < 4.5 fps all other cases" C. Channel slope < 5.0% for curb outlet swales
Storm Event
Rainfall Intensity
5-min
10-min
15-min
30-min
10-yr
7.98
6.38
5.38
3.90
25-yr
8.90
7.10
6.00
4.44
50-yr
9.58
7.62
6.43
4.84
100-yr
10.201
8.11
6.831
5.23
Drainage
Impervious
Grassed
Tc
Stonn
Rainfall
Ditch No.
C
Kerby
Kirpich
Intensity
Q (cfs)
Area (ac)
Area (ac)
Area (ac)
Event (yr)
Total Tc
Tc Used
(in/hr)
L (ft) n s
Tom
L (ft)
S
Tab
1
22.27
1.71
20.56
0.35
n/a
2000.0
0.010
15.99
15.99
15
10-yr
5.38
41.93
2
23.18
1.78
21.40
0.35
n/a
2200.0
0.015
14.72
14.72
15
10-yr
5.38
43.65
3
1.13
0.35
0.78
0.50
n/a
700.0
0.030
4.67
4.67
5
10-yr
7.98
4.51
4
1.37
0.42
0.95
0.50
n/a
515.0
0.030
3.69
3.69
5
10-yr
7.98
5.47
5
5.80
0.45
5.35
0.35
n/a
1650.0
0.010
13.79
13.79
15
10-yr
5.38
10.92
6
8.94
2.06
6.88
0.45
n/a
2100.0
0.015
14.20
14.20
15
10-yr
5.38
21.64
7
5.23
0.40
4.83
0.35
n/a
1600.0
0.010
13.47
13.47
15
10-yr
5.38
9.85
8
2.57
0.20
2.37
0.35
n/a
1350.0
0.010
11.82
11.82
10
10-yr
6.38
5.74
9
8.78
0.68
8.10
0.35
n/a
1500.0
0.010
12.81
12.81
15
10-yr
5.38
16.53
10
10.74
0.00
10.74
0.30
n/a
2100.0
0.020
12.71
12.71
15
10-yr
5.38
17.33
11
2.03
0.94
1.09
0.60
n/a
815.0
0.040
4.70
4.70
5
10-yr
7.98
9.72
12
1.44
0.66
0.78
0.60
n/a
560.0
0.050
3.23
3.23
5
10-yr
7.98
6.89
13
1.14
0.53
0.61
0.60
n/a
600.0
0.050
3.41
3.41
5
10-yr
7.98
5.46
printed: 11/2120226:40AM Page 1 of 1