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Areas Drained by Corrugated Steel Pipe
Full
Circle
Diam.
Inches |
Arch
Pipe
Type
Inches |
Opening
in
Sq. Ft.
Area |
Acres
Drained |
Mountainous
Country
(C-1) |
Rolling
Country
(C-1/3) |
Level
Country
(C-1/5) |
| 8 |
-- |
.4 |
1/4 |
1 |
2 |
| 10 |
-- |
.5 |
1/2 |
2 |
4 |
| 12 |
-- |
.7 |
3/4 |
3 |
6 |
| 15 |
17 x 13 |
1.2 |
1 |
6 |
11 |
| 18 |
21 x 15 |
1.7 |
2 |
9 |
18 |
| 21 |
24 x 18 |
2.4 |
3 |
14 |
28 |
| 24 |
28 x 20 |
3.1 |
5 |
20 |
39 |
| 30 |
35 x 24 |
4.9 |
8 |
36 |
71 |
| 36 |
42 x 29 |
7.0 |
14 |
59 |
115 |
| 42 |
49 x 33 |
9.6 |
20 |
89 |
175 |
| 48 |
57 x 38 |
12.5 |
29 |
125 |
250 |
| 54 |
64 x 43 |
15.9 |
40 |
175 |
345 |
| 60 |
71 x 47 |
19.6 |
55 |
230 |
455 |
| 66 |
77 x 52 |
23.7 |
70 |
295 |
585 |
| 72 |
83 x 57 |
28.2 |
85 |
375 |
735 |
| 78 |
87 x 63 |
33.1 |
105 |
460 |
910 |
| 84 |
95 x 67 |
38.4 |
130 |
560 |
1110 |
| 90 |
103 x 71 |
44.2 |
160 |
680 |
1340 |
| 96 |
112 x 75 |
50.3 |
190 |
800 |
1590 |
| 102 |
117 x 79 |
56.7 |
220 |
940 |
1860 |
| 108 |
128 x 83 |
63.6 |
250 |
1100 |
2170 |
| 114 |
137 x 87 |
70.9 |
290 |
1270 |
2510 |
| 120 |
142 x 91 |
78.5 |
340 |
1450 |
2870 |
| 126 |
154 x 100 |
86.6 |
380 |
1660 |
3270 |
| 132 |
167 x 103 |
95.0 |
430 |
1880 |
3710 |
| 138 |
178 x 109 |
103.9 |
490 |
2110 |
4180 |
| 144 |
186 x 113 |
113.1 |
550 |
2370 |
4680 |
Based on 4" of rainfall per hour. |