Erosion and Sediment Pollution Control Program Manual.pdf

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TABLE 7.3 - PIPE FLOW CAPACITY n = 0.025
For 70’ long Corrugated Metal Pipe, where Km = 1, (full flow assumed)
Barrel Diameter
(IN)
(FT) 12 15 18 21 24 30 36 42 48
1 2.0 3.5 5.5 8.0 11.0 18.8 28.8 41.1 55.7
2 2.8 4.9 7.7 11.3 15.6 26.6 40.8 58.2 78.8
3 3.4 6.0 9.5 13.8 19.1 32.6 49.9 71.2 96.5
4 4.0 7.0 10.9 16.0 22.1 37.6 57.7 82.3 111
5 4.4 7.8 12.2 17.9 24.7 42.1 64.5 92.0 125
6 4.9 8.5 13.4 19.6 27.0 46.1 70.6 101 136
7 5.2 9.2 14.5 21.1 29.2 49.8 76.3 109 147
8 5.6 9.8 15.5 22.6 31.2 53.2 81.5 116 158
9 6.0 10.4 16.4 24.0 33.1 56.4 86.5 123 167
10 6.3 11.0 17.3 25.3 34.9 59.5 91.2 130 176
11 6.6 11.5 18.2 26.5 36.6 62.4 95.6 136 185
12 6.9 12.1 19.0 27.7 38.2 65.2 99.9 142 193
13 7.2 12.6 19.7 28.8 39.8 67.8 104 148 201
14 7.4 13.0 20.5 29.9 41.3 70.4 108 154 208
15 7.7 13.5 21.2 30.9 42.8 72.8 112 159 216
Barrel
Length
(FT)
Correction Factors for Various Barrel Lengths and Diameters
12 15 18 21 24 30 36 42 48
20 1.53 1.47 1.42 1.37 1.34 1.28 1.24 1.20 1.18
30 1.36 1.32 1.29 1.27 1.24 1.21 1.18 1.15 1.13
40 1.23 1.21 1.20 1.18 1.17 1.14 1.12 1.11 1.10
50 1.14 1.13 1.12 1.11 1.10 1.09 1.08 1.07 1.06
60 1.06 1.06 1.05 1.05 1.05 1.04 1.04 1.03 1.03
70 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
80 0.95 0.95 .095 .096 .096 .096 0.97 0.97 0.97
90 0.90 0.91 0.91 0.92 0.92 0.92 0.93 0.94 0.94
100 0.86 0.87 0.88 0.89 0.89 0.90 0.91 0.92 0.93
120 0.80 0.81 0.82 0.83 0.83 0.85 0.86 0.87 0.89
140 0.75 0.76 0.77 0.78 0.79 0.81 0.82 0.84 0.85
160 0.70 0.71 0.73 0.74 0.75 0.77 0.79 0.80 0.82
USDA NRCS
363-2134-008 / March 31, 2012 / Page 179