58 
BULLETIN" 852, U. S. DEPARTMENT OF AGRICULTURE. 
Table 
-For Estimating the Capacity of Well-Made Concrete Pipe Lines or 
Pressure Tunnels. 
Based on formula V=C s H - 5 d°-625 using 0.345 for the coefficient C 3 
Forinstance, 100 second-feet of water, the equivalent of 64.6 million United States gallons per day, will be 
conveyed in a 48-inch pipe at a velocity of 7.96 feet per second with a loss of head (grade) of 4.22 feet per 
thousand feet of pipe. 
>> 
Inside diameter in inches and corresponding area, A , 
in square feet. 
Quan- 
tity, 
mil- 
38 
40 
42 
44 
46 
48 
54 
3S 
a 
C3 
.4 = 7.876 
.4=8.727 
.4=9.621 
4 = 10.56 
4 = ] 
L1.54 
4 = 12.57 
4 = 
15.90 
lions 
per 
day. 
a 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
Sec.- 
ft. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Gallons. 
20 
2.54 
0.57 
2.29 
0.44 
2.08 
0.34 
1.89 
0.26 
1.-73 
0.21 
1.59 
0.17 
1.26 
0.09 
12. 926 
25 
3.17 
.89 
2.86 
.68 
2.60 
.53 
2.37 
.42 
2.17 
.33 
1.99 
.26 
1.57 
.14 
16. 157 
30 
3.81 
1.29 
3.44 
.99 
3.12 
.76 
2.85 
.60 
2.60 
.47 
2.39 
.38 
1.89 
.21 
19. 389 
35 
4.44 
1.76 
4.01 
1.36 
3.64 
1.04 
3.31 
.81 
3.03 
.64 
2.78 
.52 
2.20 
.28 
22. 621 
40 
5.08 
2.30 
4.58 
1.75 
4.16 
1.36 
3.79 
1.06 
3.47 
.84 
3.18 
.67 
2.52 
.35 
25. 853 
45 
5.71 
2.90 
5.16 
2.22 
4.68 
1.72 
4.25 
1.35 
3.90 
1.07 
3.58 
.85 
2.83 
.46 
29. 084 
50 
6.35 
3.59 
5.57 
2.59 
5.20 
2.13 
4.74 
1.67 
4.33 
1.32 
3.98 
1.05 
3.14 
.57 
32. 316 
55 
6.98 
4.34 
6.30 
3.32 
5.72 
2.57 
5.21 
2.01 
4.77 
1.60 
4.38 
1.28 
3.46 
.59 
35. 547 
60 
7.62 
5.17 
6.88 
3.95 
6.24 
3.06 
5.68 
2.39 
5.20 
1.90 
4.77 
1.51 
3.77 
.82 
38. 779 
65 
8.25 
6.06 
7.45 
4.64 
6.76 
3.59 
6.16 
2.82 
5.63 
2.23 
5.17 
1.78 
4.09 
.95 
42. 010 
70 
8.89 
7.04 
8.02 
5.37 
7.28 
4.17 
6.63 
3.26 
6.07 
2.59 
5.57 
2.06 
4.40 
1.11 
45. 242 
75 
9.52 
8.07 
8.59 
6.16 
7.80 
4.78 
7.10 
3.74 
6.50 
2.96 
5.97 
2.37 
4.72 
1.28 
48. 474 
80 
10.20 
9.27 
9.17 
7.02 
8.32 
5.44 
7.58 
4.26 
6.93 
3.37 
6.36 
2.69 
5.03 
1.45 
51.705 
85 
10.80 
10.40 
9.74 
7.92 
8.84 
6.14 
8.05 
4.81 
7.37 
3.82 
6.76 
3.04 
5.35 
1.64 
54. 937 
90 
11.40 
11.60 
10.30 
8.86 
9.36 
6.88 
8.52 
5.39 
7.80 
4.27 
7.16 
3.41 
5.66 
1.84 
58. 168 
100 
12.70 
14.40 
11.50 
11.00 
10.40 
8.50 
9.47 
6.66 
8.67 
5.32 
7.96 
4.22 
6.29 
2.27 
64. 631 
110 
14.00 
17.40 
12.60 
13.20 
11.40 
10.20 
10.40 
8.02 
9.53 
6.38 
8.75 
5.09 
6.92 
2.75 
71. 096 
120 
15.20 
20.60 
13.80 
15.90 
12.50 
12.30 
11.40 
9.65 
10.40 
7.59 
9.55 
6.07 
7.55 
3.27 
77. 558 
130 
16.50 
24.20 
14.90 
18.50 
13.50 
14.30 
12.30 
11.20 
11.30 
8.96 
10.30 
7.12 
8.18 
3.84 
84.021 
140 
17.80 
28.20 
16.00 
21.40 
14.60 
16.80 
13.30 
13.10 
12.10 
10.30 
11.10 
8.19 
8.80 
4.44 
90.484 
150 
19.00 
32.10 
17.20 
24.70 
15.60 
19.10 
14.20 
15.00 
13.00 
11.90 
11.90 
9.42 
9.43 
5.10 
96. 947 
160 
20.30 
36.70 
18.30 
28.00 
16.60 
21.60 
15.20 
17.10 
13.90 
13.60 
12.70 
10.70 
10.10 
5.85 
103. 410 
170 
21.60 
41.50 
19.50 
31.80 
17.70 
24.60 
16.10 
19.20 
14.70 
15.20 
13.50 
12.10 
10.70 
6.57 
109. 870 
180 
22.80 
46.30 
20.60 
35.40 
18.70 
27.50 
17.00 
21.40 
15.60 
17.10 
14.30 
13.30 
11.30 
7.33 
116. 340 
190 
24.10 
51.70 
21.80 
39.70 
19.80 
30.80 
18.00 
24.00 
16.50 
19.10 
15.10 
15.20 
12.00 
8.26 
122. 800 
60 
66 
1 
2 
7 
8 
8 
4 
9 
O 
96 
50 
4 = 19.64 
4 =23.76 
4 = 
28.27 
A=[ 
53.18 
4 = 
38.48 
4 = 
14.18 
4 = 
50.26 
32. 316 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
2.55 
0.33 
2.10 
0.20 
1.77 
0.13 
1.51 
0.08 
1.30 
0.06 
1.13 
0.04 
0.99 
0.03 
55 
2.80 
.39 
2.31 
.24 
1.94 
.15 
1.66 
.10 
1.43 
.07 
1.24 
.05 
1.09 
.03 
35. 547 
60 
3.06 
.47 
2.53 
.28 
2.12 
.18 
1.81 
.12 
1.56 
.08 
1.36 
.06 
1.19 
.04 
38. 779 
65 
3.31 
.55 
2.74 
.33 
2.30 
.21 
1.96 
.14 
1.69 
.09 
1.47 
.07 
1.29 
.05 
42. 070 
70 
3.56 
.64 
2.95 
.39 
2.48 
.25 
2.11 
.16 
1.82 
.10 
1.58 
.08 
1.39 
.05 
45.242 
75 
3.82 
.73 
3.16 
.45 
2.65 
.28 
2.26 
.18 
1.95 
.12 
1.70 
.09 
1.49 
.06 
48. 474 
80 
4.07 
.83 
3.37 
.51 
2.83 
.32 
2.41 
.21 
2.08 
.14 
1.81 
.10 
1.59 
.07 
51.705 
85 
4.33 
.94 
3.58 
.57 
3.01 
.36 
2.56 
.24 
2.21 
.16 
1.92 
.11 
1.69 
.08 
54. 937 
90 
4.58 
1.06 
3.79 
.64 
3.18 
.40 
2.71 
.27 
2.34 
.18 
2.04 
.13 
1.79 
.09 
58. 168 
95 
4.84 
1.19 
4.00 
.71 
3.36 
.45 
2.8'. 
.30 
2.47 
.20 
2.15 
.14 
1.89 
.10 
61.400 
100 
5.09 
1.30 
4.21 
.79 
3.54 
.50 
3.01 
.33 
2.60 
.22 
2.26 
.15 
1.99 
.11 
64. 631 
110 
5.60 
1.58 
4.63 
.96 
3.89 
.61 
3.32 
.40 
2.86 
.27 
2.49 
.19 
2.19 
.13 
71. 095 
120 
6.11 
1.88 
5.05 
1.14 
4.25 
.72 
3.62 
.47 
3.12 
.32 
2.72 
.22 
2.39 
.16 
77. 558 
130 
6.62 
2.20 
5.47 
1.34 
4.60 
.85 
3.92 
.56< 
3.38 
.38 
2.94 
.26 
2.59 
.19 
84.021 
140 
7.13 
2.56 
5.89 
1.55 
4.95 
.98 
4.22 
.64 
3.64 
.44 
3.17 
.30 
2.79 
.22 
90.484 
150 
7.64 
2.94 
6.31 
1.78 
5.31 
1.13 
4.52 
.74 
3.90 
.50 
3.39 
.35 
2.98 
.25 
96. 947 
160 
8.15 
3.34 
6.73 
2.02 
5.66 
1.28 
4.82 
.84 
4.16 
.57 
3.62 
.40 
3.18 
.28 
103. 410 
170 
8.66 
3.78 
7.16 
2.29 
6.01 
1.45 
5.12 
.OS- 
4.42 
.64 
3.85 
.45 
3.38 
.32 
109. 870 
180 
9.17 
4.23 
7.58 
2.56 
6.37 
1.62 
5.43 
LO? 
4.68 
.72 
4.07 
.50 
3.58 
.36 
116.340 
190 
9.67 
4.71 
8.00 
2.86 
6.72 
1.81 
5.73 
1.19 
4.94 
.81 
4.30 
.56 
3.78 
.40 
122. 800 
200 
10.20 
5.23 
8.42 
3.16 
7.08 
2.01 
6.03 
1.32 
5.20 
.89 
4.53 
.62 
3.98 
.44 
129. 260 
220 
11.20 
6.32 
9.26 
3.83 
7.78 
2.42 
6.63 
1.59 
5.72 
1.08 
4.98 
.75 
4.38 
.54 
142. 190 
240 
12.20 
7.49 
10.10 
4.55 
8.49 
2.89 
7.23 
1.89 
6.24 
1.29 
5.43 
.89 
4.78 
.64 
155. 120 
260 
13.20 
8.77 
10.90 
5.30 
9.20 
3.39 
7.84 
2.23 
6.76 
1.51 
5.88 
1.05 
5.17 
.75 
168. 040 
280 
14. 20 
10.20 
11.80 
6.22 
9.90 
3.93 
8.44 
2.58 
7.28 
1.75 
6.34 
1.22 
5.57 
.84 
ISO. 970 
300 
15.30 
11.80 
12.60 
7.09 
10.60 
4.50 
9.04 
2.96 
7.80 
2.01 
6.79 
1.40 
5.97 
.95 
193. 890 
320 
16.30 
13.40 
13.50 
8.13 
11.30 
5.12 
9.64 
3.36 
8.32 
2.29 
7.24 
1.59 
6.37 
1.13 
206. 820 
340 
17.30 
15.10 
14.30 
9.13 
12.00 
5.77 
10.30 
3.84 
8.84 
2.58 
7.70 
1.80 
6.77 
1.28 
219. 750 
360 
18. 30 
16.90 
15.20 
10.30 
12.70 
6.46 
10.90 
4.30 
9.36 
2.89 
8.15 
2.01 
7.16 
1.43 
232. 670 
380 
19.30 
18.80 
16.00 
11.40 
13.40 
7.19 
11.50 
4.79 
9.88 
3.22 
8.60 
2.24 
7.56 
1.60 
245. 600 
