SW6210601_Design Calculations (Ditch Table)_20210603

SWALE CALCULATIONS
A. Flow velocity < 2.0 fps when outletting to wetlands
B. Channel slope < 5.0%
Swale No. Drainage Impervious Grassed C Q (efs) Slope(%) V�11-(fps) V...Aps) Flo
I I Area(ac) I Area(ac) Area (ac) I I I I I I
1
1.06
0.08
0.98
0.35
1.5
0.75
n/a
1.32
0.37
2
3.32
0.26
3.06
0.35
4.7
0.75
n/a
1.54
0.73
3
2.61
0.20
2.41
0.35
3.7
0.50
n/a
1.50
0.83
4
1.33
0.37
0.96
0.48
5.0
0.75
2.0
1.84
0.67
5
0.46
0.24
0.22
0.64
2.3
1.00
2.0
1.65
0.42
6
8.89
1.78
7.11
0.43
30.2
1.60
n/a
4.09
1.27
7
1.06
0.41
0.65
0.55
4.6
0.90
2.0
1.93
0.62
8
1.74
0.46
1.28
0.47
6.4
0.80
n/a
2.01
0.75
9
0.72
0.20
0.52
0.48
2.7
1.90
n/a
1.73
0.46
10
0.99
0.24
0.75
0.46
3.5
2.00
n/a
1.84
0.52
11
1.61
0.45
1.16
0.48
6.0
0.30
n/a
1.38
0.92
12
1.01
0.20
0.81
0.43
3.4
0.30
n/a
1.19
0.70
13
17.42
2.95
14.47
0.41
31.6
0.50
n/a
3.07
1.55
14
17.42
2.95
14.47
0.41
31.6
1.20
n/a
3.86
1.35
15
5.76
1.24
4.52
0.44
11.2
0.70
n/a
2.11
1.04
16
23.18
4.28
18.90
0.42
42.9
0.70
2.0
1.81
2.49
17
0.00
0.00
18
0.00
0.00
19
0.00
0.00
20
0.00
0.00
printed: 6/3/2021 2 17 PM Page 1 of 1