60 
BULLETIN 852. U. S. DEPARTMENT OF AGRICULTURE. 
Table 9. — For Estimating the Capacity of Glazed Concrete Pipe Lestes. 
Based on formula V= C s H -*d°-#s using 0.370 for the coefficient C s For instance, 140 second-feet of water, the 
equivalent of 90.5 million United States gallons per day, will be conveyed by a 54-inch pipe at a velocity 
of 8.80 feet per second with a loss of head (grade) of 3.86 feet per thousand feet of pipe. 
Inside diameter in inches and corresponding area, A, 
in square feet. 
Quan- 
Quan- 
tity 
(Q). 
16 
18 
20 
22 
24 
30 
36 
tity, 
mil- 
^1 = 1.396 
A = 
L.767 
A = 
2.182 
A = 
2.640 
A = 
3.142 
A'** 
1.909 
A = 
7.068 
lions 
per 
day. 
V 
H 
V 
II 
V 
II 
V 
II 
V 
H 
V 
H 
V 
H 
Sec.-ft. 
Feet. 
Feet. 
Feet. 
Fed. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Gals. 
2.0 
2.5 
1.43 
1.79 
0.4S 
. .73 
1.13 
1.42 
0.25 
.40 
0.92 
1.15 
0.15 
.23 
0.76 
.95 
0.09 
.14 
0.64 
.SO 
0.05 
.09 
1 
1.29 
1.62 
"6 ".si 
"6.03 
3.0 
2.15 
1.06 
1.70 
.56 
1.37 
.32 
1.14 
.20 
.95 
.12 
.61 
.03 
1.94 
3.5 
2.51 
1.44 
1.98 
.77 
1.60 
.44 
1.33 
.27 
1.11 
.17 
.71 
.05 
~"o".50 
"6.02 
2.26 
4.0 
2.86 
1.87 
2.23 
.98 
1.83 
.57 
1.52 
.36 
1.27 
.23 
.81 
.07 
.57 
.03 
2.5S 
4.5 
3.22 
2.35 
2.55 
1.28 
2.06 
.73 
1.70 
.44 
1.43 
.28 
.92 
.09 
.64 
.03 
2.91 
5.0 
3.5S 
2.92 
2.83 
1.57 
2.29 
.90 
1.89 
2.08 
.55 
1.59 
.35 
1.02 
.10 
.71 
.04 
3.23 
5.5 
3.94 
3.54 
3.11 
1.90 
2.52 
1.10 
.66 
. 1.75 
.42 
1.12 
.13 
.78 
.05 
3 .55 
|5.0 
4.30 
4.22 
3.40 
2.28 
2.75 
1.30 
2.27 
.79 
1.91 
.50 
1.22 
.16 
.85 
.06 
3.83 
6.5 
4.66 
4.95 
3.68 
2.67 
2.98 
1.53 
2.46 
.93 
2.07 
.59 
1.32 
.18 
.92 
.07 
4.20 
7.0 
5.01 
5.73 
3.96 
3.09 
3.21 
1.78 
2.65 
1.08 
2.23 
.69 
1.42 
.21 
.99 
.08 
4.52 
7.5 
5.37 
6.58 
4.24 
3.54 
3.44 
2.04 
2.84 
1.23 
2.39 
.78 
1.53 
.24 
1.06 
.10 
4.S5 
8.0 
5.72 
7.49 
4.53 
4.04 
3.67 
2.33 
3.03 
1.41 
2.55 
.90 
1.63 
.28 
1.13 
.10 
5.17 
8.5 
6.09 
8.46 
4.81 
4.56 
3.90 
2.62 
3.22 
1.59 
2.71 
1.02 
1.73 
.31 
1.20 
.12 
5.49 
9.0 
6.45 
9.49 
5.10 
5.13 
4.12 
2.93 
3.41 
1.78 
2.86 
1.12 
1.83 
.35 
1.27 
.13 
5.82 
9.5 
6.80 
10.60 
5.38 
5.70 
4.35 
3.27 
3.60 
1.99 
3.02 
1.25 
1.94 
.39 
1.34 
.15 
6.14 
10 
7.16 
11.70 
5.66 
6.31 
4.58 
3.62 
3.79 
2.20 
3.18 
1.39 
2.04 
.43 
1.41 
.16 
6.46 
11 
7.SS 
14.20 
6.22 
7.62 
5.04 
4.38 
4.17 
2.67 
3.50 
1.69 
2.24 
.52 
1.56 
.20 
7.11 
12 
8.60 
16.90 
6.79 
9.04 
5.50 
5.22 
4.55 
3.17 
3.82 
2.01 
2.44 
.62 
1.70 
.24 
7.76 
13 
9.31 
19.80 
7.36 
10.70 
5.96 
6.14 
4.92 
3.71 
4.14 
2.36 
2.65 
.73 
1.84 
.2S 
8.40 
14 
10.00 
22.90 
7.92 
12.30 
6.42 
7.12 
5.30 
4.30 
4.46 
2.74 
2.85 
.84 
1.98 
.32 
9.00 
15 
10.70 
26.30 
8.49 
14.20 
6.87 
8.16 
5.60 
4.81 
4.77 
3.13 
3.06 
.97 
2.12 
.37 
9.69 
18 
11.50 
30.10 
9.06 
16.20 
7.33 
9.30 
6.06 
5.63 
5.09 
3.56 
3.26 
1.10 
2.26 
.43 10 .30 
17 
12.20 
34.00 
9.62 
18.20 
7.79 
10.40 
6.44 
6.36 
5.41 
4.02 
3.46 
1.24 
2.40 
.48 11 .00 
18 
12.90 
38.00 
10.20 
20.50 
8.25 
11.70 
6.82 
7.13 
5.73 
4.51 
3.67 
1.40 
2.55 
.54 11 .60 
20 
14.30 
46.60 
11.30 
25.10 
9.17 
14.50 
7.58 
8.78 
6.39 
5.58 
4.07 
1.72 
2.83 
.66 12 .90 
22 
15 .80 
56.90 
12.40 
30.20 
10.10 
17.60 
8.33 
10.60 
7.00 
6.74 
4.48 
2.09 
3.11 
.80 14 .20 
24 
17.20 
67.50 
13.60 
36.40 
11.00 
20 .SO 
9.09 
12.80 
7.64 
8.02 
4.89 
2.49 
3.40 
.96 15 .50 
26 
18.60 
78.90 
91.30 
14.70 
42.60 
11.90 
24.40 
9.85 
14.90 
8.27 
9.39 
5.30 
2.92 
3.68 
1.12:16 .SO 
28 
20.00 
15.80 
49.20 
12 .SO 
28.30 
10.60 
17.20 
8^91 
11.00 
5.70 
3.38 
3.96 
1.3018.10 
30 
21.50 
105 .50 
17.00 
56.90 
13.70 
32.40 
11.40 
20.00 
9.55 
12.50 
6.11 
3.89 
4.24 
1.4919.40 
32 
22.90 
114.60 
18.10 
64.10 
14.70 
37.30 
12.10 
22.40 
10.20 
14.30 
6.52 
4.42 
4.53 
1.7120.70 
34 
24.00135.70 
19.20 
72.60 
15.60 
42.00 
12.90 
25.60 
10 .SO 
16.00 
6.93 
4.99 
4.81 
1.9l!22.00 
36 
25.80 151.80 
20.40 
82.00 
16.50 
47.00 
13.60 
28.80 
11.40 
17.90 
7.33 
5.59 
5.08 
2.15|23.30 
38 
27.20jl68.60 
21.50 
90.90 
17.40 
52.00 
14.40 
31.80 
12.10 
20.10 
7.74 
6.22 
5.38 
2.40 
24.50 
38 
4 
O 
4 
2 
4 
4 
4 
6 
4 
8 
5 
4 
20 
^4= 7.876 
A = 
S.727 
A= 
3.621 
A = 
L0.56 
A = 
11.54 
A = 
L2.57 
A = 
15.90 
12.9 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
2.54 
0.50 
2.29 
0.38 
2.08 
0.30 
1.89 
0.23 
1.73 
0-18 
1.59 
0.15 
1.26 
0.08 
25 
3.17 
.77 
2.86 
.59 
2.60 
.46 
2.37 
.37 
2.17 
.29 
1.99 
.23 
1.57 
.12 
16.2 
30 
3.81 
1.12 
3.44 
.86 
3.12 
.66 
2.85 
.52 
2.60 
.41 
2.39 
.33 
1.89 
.18 
19.3 
35 
4.44 
1.53 
4.01 
1.18 
3.64 
.90 
3.31 
.70 
3.03 
.56 
2.78 
.45 
2.20 
.24 
22.6 
40 
5.08 
2.00 
4.58 
1.52 
4.16 
1.18 
3.79 
.92 
3.47 
.73 
3.18 
.58 
2.52 
.31 
25.9 
45 
5.71 
2.52 
5.16 
1.93 
4.68 
1.50 
4.26 
1.17 
3.90 
.93 
3.58 
.74 
2.83 
.40 
29.1 
50 
6.35 
3.12 
5 .57 
2.25 
5.20 
1.85 
4.74 
1.45 
4.33 
1.15 
3.98 
.91 
3.14 
.50 
32.3 
55 
6.98 
3.77 
6.30 
2.89 
5.72 
2.23 
5.21 
1.75 
4.77 
1.39 
4.38 
1.11 
3.46 
.60 
35 .5 
60 
7.62 
4.49 
6.88 
3.43 
6.24 
2.66 
5.68 
2.08 
5.20 
1.65 
4.77 
1.31 
3.77 
.71 
38.8 
65 
8.25 
5.27 
7.45 
4.03 
6.76 
3.12 
6.16 
2.45 
5.63 
1.94 
5.17 
1.55 
4.09 
.83 
42.0 
70 
8.89 
6.12 
8.02 
4.67 
7.28 
3.62 
6.63 
2. S3 
6.07 
2.25 
5.57 
1.79 
4.40 
.96 
45.2 
75 
9.52 
7.02 
8.59 
5.36 
7.80 
4.16 
7.10 
3.25 
6.50 
2.57 
5.97 
2.06 
4.72 
1.11 
48.5 
80 
10.20 
8.06 
9.17 
6.10 
8.32 
4.73 
7.58 
3.70 
6.93 
2.93 
6.36 
2.34 
5.03 
1.26 
51.7 
85 
10.80 
9.04 
9.74 
6.88 
8.84 
5.34 
8.05 
4.18 
7.37 
3.32 
6.76 
2.64 
5.35 
1.42 
54.9 
90 
11.40 
10.10 
10.30 
7.70 
9.36 
5.98 
8.52 
4.69 
7.80 
3.71 
7.16 
2.96 
5.66 
1.60 
5S.2 
100 
12.70 
12.50 
11.50 
9.56 
10.40 
7.39 
9.47 
5.79 
8.67 
4.62 
7.96 
3.67 
6.29 
1.97 
64.6 
110 
14.00 
15.10 
12.60 
11.50 
11.40 
8.87 
10.40 
6.97 
9.53 
5 .55 
8.75 
4.42 
6.92 
2 .39 
71.1 
120 
15.20 
17.90 
13 .SO 
13.80 
12.50 
10.70 
11.40 
8.89 
10.40 
6.60 
9.55 
5.22 
7.55 
2.84 
77.6 
130 
16.50 
21.00 
14.90 
16.10 
13.50 
12.40 
12.30 
9.74 
11.30 
7.79 
10.30 
6.19 
8.18 
3.34 
S4.0 
140 
17 .SO 
24.50 
16.00 
18.60 
14.60 
14.60 
13.30 
11.40 
12.10 
8.96 
11.10 
7.12 
8.80 
3.S6 
90.5 
150 
19.00 
27.90 
17.20 
21.50 
15.60 
16.60 
14.20 
13.00 
13.00 
10.30 
11.90 
8.19 
9.43 
4 .43 
96.9 
160 
20.30 
31.90 
18.30 
24.30 
16.60 
IS .80 
15.20 
14.80 
13 .90 
11 .SO 
12 .70 
9.30 
10.10 
5.09 
103.0 
170 
21.60 
36.10 
19.50 
27.60 
17.70 
21.40 
16.10 
16.70 
14.70 
13.20 
13.50 
10.50 
10.70 
5.71 
110 .0 
180 
22.80 
40.20 
20.60 
30.80 
18.70 
23.90 
17.00 
IS .60 
15.60 
14 .90 
14 .30 
11.80 
11.30 
6.37 
116.0 
190 
24.10 
44.90 
21.80 
34.50 
19.80 
26.80 
18.00 
20.90 
16.50 
16.60 
15.10 
13.20 
12.00 
7. IS, 123.0 
