SW6220701_Design Calculations_20220810 (2)

[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
7.94
6.35
5.36
3.88
25-yr
8.92
7.10
6.00
4.45
50-yr
9.64
7.67
6.47
4.88
100-yr
10.301
8.21
6.92
5.30
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
0.22
0.05
0.17
0.45
n/a
295.0
0.030
2.40
2.40
5
10-yr
7.94
0.79
2
3.20
0.49
2.71
0.40
n/a
1200.0
0.010
10.79
10.79
10
10-yr
6.35
8.13
3
0.31
0.07
0.24
0.45
n/a
200.0
0.020
2.08
2.08
5
10-yr
7.94
1.11
4
0.91
0.14
0.77
0.40
n/a
420.0
0.010
4.81
4.81
5
10-yr
7.94
2.89
5
1.35
0.00
1.35
0.30
n/a
430.0
0.020
3.75
3.75
5
10-yr
7.94
3.22
6
4.58
0.35
4.23
0.35
n/a
1100.0
0.020
7.73
7.73
10
10-yr
6.35
10.18
7
5.02
0.39
4.63
0.35
n/a
1200.0
0.010
10.79
10.79
10
10-yr
6.35
11.16
8
0.41
0.09
0.32
0.45
n/a
510.0
0.050
3.00
3.00
5
10-yr
7.94
1.46
9
0.41
0.06
0.35
0.40
n/a
460.0
0.020
3.95
3.95
5
10-yr
7.94
1.30
10
3.72
0.57
3.15
0.40
n/a
1300.0
0.015
9.82
9.82
10
10-yr
6.35
9.45
11
0.11
0.03
0.08
0.45
n/a
150.0
0.015
1.86
1.86
5
10-yr
7.94
0.39
12
0.42
0.10
0.32
0.45
n/a
760.0
0.02
6.49
6.49
5
10-yr
7.94
1.5C
printed: 8/10/2022 1:15 PM Page 1 of 1