4^ 
The Colorado Experiment Station. 
Depth in all cases in the following tables is measured in still water. See 
page 25. 
TABLE I. 
Auxiliary Table for Approximating to Velocity of Approach. 
Depth of water over 
weir 
Average velocity 
in section of 
weir 
Depth of water over 
weir 
Average Velocity 
in section of 
weir 
in ft. 
in in. 
in feet per sec. 
in ft. 
in in. 
in ft. per sec. 
.25 
3 
1.665 
1.75 
21 
4.400 
.50 
6 
2.354 
2.00 
24 
4.709 
.75 
9 
2.884 
2.25 
27 
4.995 
1.00 
12 
3.330 
2.50 
30 
5.265 
1.25 
15 
3.723 
2.75 
33 
5.510 
1.50 
18 
4.078 
3.00 
36 
5.765 
TABLE II. 
Corrections in per eent. for velocity of approach, to be applied to values 
obtained from Tables III to VI. 
DEPTH OVER WEIR. IN FEET 
veloc¬ 
ity 
Head* 
.25 
.50 
.75 
1.00 
1.25 
1.50 
1.75 
2.00 
2.25 
2.50 
2.75 
3.00 
.25 
.0010 
00.8 
00.4 
0.3 
0.2 
0.2 
0.1 
0.1 
0.1 
0.1 
0.1 
0.1 
0.1 
.50 
.0039 
03.5 
1.8 
1.2 
0.9 
0.7 
0.6 
0.5 
0.4 
0.4 
0.3 
0.3 
0.3 
.75 
.0087 
08.0 1 
1 4.0 
2.6 
2.0 
1.6 
1.3 
1.1 
1.0 
0.9 
0.8 
0.7 
0.7 
1.00 
.0155 
14.3 
7.1 | 
1 4.7 
3.5 
2.8 
2.3 
2.0 
1.8 
1.6 
1.4 
1.3 
1.2 
1.25 
.0243 
22.6 
11.1 
7.4 
5.5 I 
4.4 
3.7 
3.1 
2.7 
2.4 
2.2 
2.0 
1.8 
1.50 
.0350 
33.1 
16.1 
10.7 
8.0 
6.4 
5.3 | 
I 4.5 
4.0 
3.5 
3.2 
2.9 
2.6 
1.75 
.0476 
45.7 
22.2 
14.6 
10.9 
8.7 
7.2 
6.2 
5.4 1 
1 4.8 
4.3 
3.9 
3.6 
2.00 
.0622 
60.9 
29.2 
19.2 
14.3 
11.4 
9.5 
8.1 
7.1 
6-3 
5.6 | 
’ 5.1 
4.7 
2.25 
.0787 
78-6 
37.4 
24.5 
18.2 
14.5 
12.0 
10.3 
9.0 
8.0 
7.2 
6.5 
6.0 
2.50 
.0971 
99.1 
46.7 
30.5 
22.6 
18.0 
14.9 
12.7 
11.1 
9.9 
8.9 
8.0 
7.4 
2.75 
.1175 
121.8 
56.9 
37.0 
27.4 
21.8 
18-0 
15.4 
13.4 
11.9 
10.7 
9.7 
8.9 
3.00 
.1398 
1494 
69.1 
44.8 
31.1 
26.2 
21.7 
18.5 
16.1 
14.3 
12.8 
11.7 
10.7 
3.25 
.1641 
179.6 
82.3 
53.1 
39.1 
30.9 
25.6 
21.8 
19.0 
16.9 
15.1 
13.7 
12.6 
3.50 
.1903 
213.5 
96.9 
61.7 
45.7 
36.1 
29.9 
25.4 
22.2 
19.6 
17.6 
16.0 
14.6 
3.75 
.2185 
251.3 
113.0 
72.3 
53.0 
41.8 
34.5 
29.4 
25.6 
22.6 
20.3 
18.4 
16.8 
4.00 
.2486 
293.1 
130.7 
82.6 
60.9 
47.9 
39.5 
33.6 
29.2 
25.9 
23.2 
21.0 
19.2 
*Head=— - - v being velocity in feet per second, in first column. 
64.36 
