70 
BULLETIN 376, U. S. DEPARTMENT OF AGRICULTURE. 
Table 7 (Continued). — Velocity V in feet per second and loss of head H in feet per thou- 
sand feet of pipe, necessary to the conveyance of a given quantity of water, Q, in second- 
feet and in millions of U. S. gallons per day through wood-stave pipe. For instance, 
160 second-feet will be carried by a 42-inch pipe at a velocity of 16.6 feet per second with 
a loss of head of 15.3 feet per thousand feet of pipe. 
Inside diameter, in inches and corresponding area, A 
in square feet. 
Quan- 
Quan- 
tity, 
tity. 
26 
88 
30 
32 
34 
36 
38 
mil- 
A= 3.687. 
A= 4.276. 
A= 4.909. 
A=5 
.585. 
A= 6.305. 
A= 7.069. 
A=7 
876. 
lions 
per 
day. 
Q 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
V 
H 
V 
II 
Sec.-ft. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet. 
Feet 
Gals. 
8 
2.17 
0.68 
1.87 
0.48 
1.63 
0.34 
1.43 
0.25 
1.27 
0.19 
1.13 
0.14 
1.02 
0.11 
5.171 
9 
2.44 
.85 
2.10 
.59 
1.83 
.43 
1.61 
.31 
1.43 
.23 
1.27 
.18 
1.14 
.14 
5.817 
10 
2.71 
1.02 
2.34 
.72 
2.04 
.52 
1.79 
.38 
1.59 
.28 
1.41 
.22 
1.27 
.17 
6.463 
11 
2.98 
1.21 
2.57 
.85 
2.24 
.62 
1.97 
.45 
1.75 
.34 
1.56 
.26 
1.40 
.20 
7.109 
12 
3.25 
1.42 
2.81 
1.00 
2.45 
.72 
2.15 
.53 
1.90 
.39 
1.70 
.30 
1.52 
.23 
7.756 
13 
3.53 
1.64 
3.04 
1.15 
2.65 
.82 
2.33 
.61 
2.06 
.46 
1.84 
.35 
1.65 
.27 
8.402 
14 
3.80 
1.87 
3.27 
1.32 
2.85 
.95 
2.51 
.70 
2.22 
.52 
1.98 
.40 
1.78 
.31 
9.048 
16 
4.34 
2.38 
3.74 
1.67 
3.26 
1.20 
2.87 
.89 
2.54 
.67 
2.26 
.50 
2.03 
.39 
10.341 
18 
4. 88 2. 94 
4.21 
2.07 
3.67 
1.49 
3.22 
1.09 
2.86 
.82 
2.55 
.62 
2.29 
.48 
11.634 
20 
5. 42 3. 56 
4.68 
2.50 
4.07 
1.80 
3.58 
1.32 
3.17 
.99 
2.83 
.75 
2.54 
.58 
12. 920 
22 
5.97 
4.23 
5.15 
2.96 
4.48 
2.14 
3.94 
1.57 
3.49 
1.18 
3.11 
.90 
2.79 
.69 
14. 219 
24 
6.51 
4.94 
5.61 
3.47 
4.89 
2.50 
4.30 
1.84 
3.81 
1.38 
3.40 
1.05 
3.05 
.81 
15.512 
26 
7.05 
5.70 
6.08 
4.02 
5.30 
2.89 
4.66 
2.12 
4.12 
1.59 
3.68 
1.21 
3.30 
.93 
16. 804 
28 
7. 59 6. 55 
6.55 
4.58 
5.70 
3.30 
5.01 
2.42 
4.44 
1.82 
3.96 
1.38 
3.56 
1.07 
18. 097 
30 
8.14 
7.40 
7.02 
5.18 
6.11 
3.73 
5.37 
2.74 
4.76 
2.05 
4.24 
1.56 
3.81 
1.21 
19. 389 
32 
8.68 
8.30 
7.48 
5.82 
6.52 
4.19 
5.73 
3.08 
5.08 
2.29 
4.53 
1.76 
4.06 
1.36 
20. 682 
36 
9.76 
10.25 
8.42 
7.19 
7.33 
5.18 
6.45 
3.81 
5.71 
2.85 
5.09 
2.17 
4.57 
1.67 
23. 267 
40 
10.8 
12.4 
9.35 
8.72 
8.15 
6.26 
7.16 
4.61 
6.34 
3.45 
5.66 
2.62 
5.08 
2.04 
25. 853 
45 
12.2 
15.3 
10.5 
10.8 
9.17 
7.74 
8.06 
5.70 
7.14 
4.27 
6.37 
3.25 
5.71 
2.51 
29.084 
50 
13.6 
18.5 
11.7 
13.0 
10.2 
9.36 
8.95 
6.90 
7.93 
5.16 
7.07 
3.92 
6.35 
3.04 
32.316 
55 
14.9 
22.0 
12.9 
15.5 
11.2 
11.1 
9.85 
8.15 
8.72 
6.11 
7.78 
4.66 
6.98 
3.59 
35. 547 
60 
16.3 
25.6 
14.0 
18.1 
12.2 
13.0 
10.7 
9.56 
9.52 
7.16 
8.49 
5.44 
7.62 
4.21 
38. 779 
65 
17.6 
29.6 
15.2 
20.9 
13.2 
15.0 
11.6 
11.0 
10.3 
8.27 
9.20 
6.29 
8.25 
4. S7 
42.010 
70 
19.0 
33.9 
16.4 
23.8 
14.3 
17.1 
12.5 
12.6 
11.1 
9.44 
9.90 
7.19 
8.89 
5. 55 
45. 242 
75 
20.3 
38.2 
17.5 
26.9 
15.3 
19.4 
13.4 
14.3 
11.9 
10.7 
10.6 
8.13 
9.52 
6.29 
48. 474 
80 
18.7 
30.2 
16.3 
21.8 
14.3 
16.0 
12.7 
12.0 
11.4 
9.13 
10.2 
7.07 
51. 705 
85 

19.9 
33.9 
17.3 
24.3 
15.2 
17.9 
13.5 
13.4 
12.0 
10.2 
10.8 
7.87 
54. 937 
90 
21.0 
37.4 
18.3 
19.4 
20.4 
26.9 
29.7 
32.6 
16.1 
17.0 
17.9 
19.8 
21.8 
24.0 
14.3 
15.1 
15.9 
14.8 
16.4 
17.9 
12.7 
13.4 
14.2 
11.3 
12.5 
13.7 
11.4 
12.1 
12.7 
8.73 
9.61 
10.6 
58. 168 
95 
61.400 
100 
64. 632 
1 
40 
4 
2 
4 
4 
4 
6 
4 
8 
5 
4 
G 

A= 8.727 
A=9 
.621. 
A=] 
0.56. 
A=l 
1.54. 
A=l 
2.57. 
A=l 
5.90. 
A=] 
9.64. 
V 
H 
Y 
H 
V . 
II 
V 
H 
V 
H 
V 
H 
V 
H 
30 
3.44 
0.95 
3.12 
0.75 
2.85 
0.60 
2.60 
0.49 
2.39 
0.40 
1.89 
0.23 
1.53 
0.14 
19.389 
35 
4.01 
1.26 
3.64 
.99 
3.31 
.79 
3.03 
.04 
2.78 
.52 
2.20 
.30 
1.78 
.18 
22. 621 
40 
4.58 
1.59 
4.16 
1.26 
3.79 
1.00 
3.47 
.82 
3.18 
.67 
2.52 
.38 
2.04 
.23 
25. 853 
45 
5.16 
1.97 
4.68 
1.56 
4.26 
1.25 
3.90 
1.01 
3.58 
.82 
2.83 
.47 
2.29 
.28 
29.084 
50 
5.73 
2.26 
5.20 
1.88 
4.74 
1.50 
4.33 
1.22 
3.98 
.99 
3.14 
.57 
2.55 
.34 
32.316 
55 
6.30 
2.82 
5.72 
2.24 
5.21 
1.79 
4.77 
1.45 
4.38 
1.18 
3.46 
.67 
2.80 
.41 
35.547 
60 
6.88 
3.29 
6.24 
2.62 
5.68 
2.09 
5.20 
1.69 
4.77 
1.38 
3.77 
.79 
3.06 
.48 
38.779 
65 
7.45 
3.80 
6.76 
3.01 
6.16 
2.42 
5.63 
1.95 
5.17 
1.59 
4.09 
.91 
3.31 
.55 
42.010 
70 
8.02 
4.36 
7.28 
3.44 
6.63 
2.76 
6.07 
2.23 
5.57 
1.82 
4.40 
1.04 
3.56 
.63 
45. 242 
75 
8.59 
4.92 
7.80 
3.89 
7.10 
3.12 
6.50 
2.53 
5.97 
2.06 
4.72 
1.18 
3.82 
.73 
48.474 
80 
9.17 
5.53 
8.32 
4.37 
7.58 
3.51 
6.93 
2.84 
6.36 
2.31 
5.03 
1.32 
4.07 
.80 
51.705 
85 
9.74 
6.16 
8.84 
4.88 
8.05 
3.92 
7.37 
3.17 
6.76 
2.58 
5.35 
1.47 
4.33 
.89 
54. 937 
90 
10.3 
6.84 
9.36 
5.41 
8.52 
4.34 
7.80 
3.53 
7.16 
2.87 
5.66 
1.63 
4.58 
.99 
58. 168 
95 
10.9 
7.55 
9.87 
5.96 
9.00 
4.78 
8.23 
3.87 
7.56 
3.16 
5.98 
1.80 
4.84 
1.09 
61.400 
100 
11.5 
8.30 
10.4 
6.55 
9.47 
5.24 
8.67 
4.25 
7.96 
3.46 
6.29 
1.97 
5.09 
1.19 
64.031 
110 
12.6 
9.79 
11.4 
7.77 
10.4 
6.24 
9.53 
5.04 
8.75 
4.11 
6.92 
2.35 
5.60 
1.42 
71.095 
120 
13.8 
11.5 
12.5 
9.09 
11.4 
7.23 
10.4 
5.89 
9.55 
4.81 
7.55 
2.74 
6.11 
1.05 
77.55S 
130 
14.9 
13.3 
13.5 
10.5 
12.3 
8.41 
11.3 
6.81 
10.34 
5.55 
8.18 
3.17 
6.62 
1.91 
84.021 
140 
16.0 
15.1 
14.6 
12.0 
13.3 
9.60 
12.1 
7.77 
11.1 
6.35 
8.81 
3.62 
7.13 
2.19 
90. 484 
150 
17.2 
17.1 
15.6 
13.6 
14.2 
10.9 
13.0 
8.81 
11.9 
7.18 
9.43 
4.10 
7.64 
2.48 
90.947 
160 
18.3 
19.3 
16.6 
15.3 
15.2 
12.2 
13.9 
9.89 
12.7 
8.07 
10.1 
4.60 
8.15 
2.78 
103.41 
170 
19.5 
21.4 
17.7 
17.0 
16.1 
13.6 
14.7 
11.0 
13.5 
8.98 
10.7 
5.13 
8.66 
3.12 
109. 87 
180 
20.6 
23.8 
18.7 
18.9 
17.0 
15.1 
15.6 
12.2 
14.3 
9.96 
11.3 
5.70 
9.17 
3.43 
110.34 
190 
19.8 
20.8 
20.8 
22.8 
18.0 
18.9 
16.7 
18.3 
16.5 
17.3 
13.5 
14.8 
15. 1 
15.9 
11.0 
12.1 
12.0 
12.0 
6.28 
6.89 
9.67 
10.2 
3.79 
4.16 
122.80 
200 
"" 
129.26 
210 
19.8 
20.8 
20.0 
21.7 
18.2 
19. 1 
19.9 
20.8 
16.1 
17.5 
19.0 
20.5 
16.7 
17.5 
IS. 3 
19.1 
19.9 
13.2 
14.3 
15.5 
16.8 
18.0 
13.2 
13.8 
14.5 
15.1 
15.7 
7.51 
8.17 
8.86 
9.54 
10.3 
10.7 
11.2 
11.7 
12.2 
.12.7 
4.54 
4.94 
5.34 
5. 78 
6.22, 
135. 73 
220 
142.19 
230 
US. 05 
240 
155.12 
250 

161.58 
1 
