34 
BULLETIN 906, U. S. DEPARTMENT OF AGRICULTURE. 
Table 2. — Discharge tables for rectangular weirs. 
0.566 p 
Computed from the formula Q=3.247?i?i. 
1+2/i.s. 
H 1 . 9 . 
Dischar.se in cubic feet per second 
Discharge in cubic feet per second 
Head 
Head 
for 
crests of various lengths. 
Head 
Head 
for crests of various lengths. 
m 
in 
inches. 
m 
feet. 
in 
inches. 
feet. 
1 
1 foot. 
l.5feet. 
2 feet. 
3 feet. 
4 feet. 
1 foot. 1.5feet. 
2 feet. 3 feet. 4 feet. 
0.20 
2| 
0.291 
0.439 
0.588 
0.887 
1.19 
.86 
10ft 
2.46 
3.72 
5.01 
7. 59 10. 19 
.21 
2* 
.312 
.472 
.632 
.954 
1.28 
.87 
10ft 
2.50 
3.79 
5.10 
7-72 
10.36 
.22 
2f 
.335 
-505 
.677 I 
1.02 
1.37 
.88 
ioft 
2.54 
3.85 
5.18 
7.85 
10.54 
.23 
2§ 
.358 
.539 
.723 
1.09 
1.46 
.89 
il 
2.58 
3.92 
5.27 
7.99 
10.71 
.24 
2| 
.3S0 
.574 
.769 
1.16 
1.55 
.90 
2.62 
398 
5-35 
8.12 
10.89 
.25 
3 
.404 
.609 
.817 
1 23 
1.65 
.91 
ioh 
2.67 
4.05 
5.44 
8.25 
11.07 
.26 
3| 
.428 
.646 
.865 : 
1.31 
1.75 
.92 
lift 
2.71 
4.11 
5-53 
8.38 
11.25 
.27 
3i 
.452 
.682 
.914 
1.38 
1.85 
.93 
lift 
2.75 
4.18 
5-62 
8.52 
11.43 
.28 
3| 
.477 
.720 
.965 
1.46 
1.95 
.94 
ill 
2.79 
4.24 
5.71 
8.65 
11.61 
.29 
3* 
.502 
.758 
1.02 
1.53 
2.05 
.95 
nf 
2.84 
4. 31 
5.80 
8.79 
11.79 
.30 
31 
3? 
.527 
.796 
1.07 ! 
1.61 
2.16 
.96 
iu 
2.88 
4 37 
5.89 
8.93 
11.98 
.31 
.553 
.836 
1.12 
1.69 
2.26 
.97 
nf 
HI 
2.93 
4.44 
5.98 
9.06 
12.16 
.32 
3H 
.580 
-876 
1.18 
1.77 
2.37 
.98 
2.97 
4.51 
6 07 
9.20 
12.34 
.33 
m 
.606 
.916 
1.23 
1.86 
2.48 
.99 
HI 
3-01 
4.57 
6. 15 
9.34 
12. 53 
.34 
±h 
.634 
.957 
1.28 
1.94 
2.60 
1.00 
12 
3.06 
4.64 
6.25 
9.48 
12.72 
.35 
4ft 
.661 
.999 
1.34 
2.02 
2,71 i 
1.01 
12J 
4.71 
6 34 
9.62 
12.91 
.36 
4ft 
.688 
104 
1.40 1 
2.11 
2.82 i 
1.02 
12i 
4.78 
6.43 
9.76 
13.10 
.37 
4ft 
.717 
1.08 
1.45 
2.20 
2.94 
1.03 
12f 
4.85 
6.52 
9.90 
13.28 
-38 
4ft 
.745 
1.13 
1.51 
2.28 
3 06 
1.04 
12i 
4 92 
6- 62 
10 04 
1347 
.39 
4H 
.774 
1.17 
1.57 
2.37 
3-18 
1.05 
12f 
4.98 
6 71 
10.18 
13.66 
.40 
4H 
.804 
1.21 
1.63 
2.46 
3.30 
1.06 
12f 
5.05 
6.80 
10.32 
13.85 
.41 
m 
-833 
1.26 
1.69 
2.55 
3.42 
1.07 
12H 
5 12 
6.90 ! 10.46 
14.04 
-42 
5ft 
.863 
1.30 
1.75 
2.65 
3.54 
1.08 
12H 
5 20 
6.99 ' 10.61 
14.24 
• 43 
5ft 
.893 
1.35 
1.81 
2. 74 
3.67 
1.09 
13ft 
5.26 
7.09 , 10.75 
14.43 
• 44 
5| 
■ 924 
1.40 
1-88 
2.83 
3.80 
1.10 
13ft 
5.34 
7.19 i 10.90 
14.64 
.45 
5| 
955 
1.44 
1.94 
2.93 
3.93 
1.11 
13ft 
5 41 
7.28 ! 11.04 
14.83 
.46 
5i 
.986 
1.49 
2.00 
3.03 
4.05 
1.12 
13ft 
5.48 
7.38 ! 11-19 
15.03 
.47 
i 
5s 
1.02 
1.54 
2.07 
3.12 
4.18 
1.13 
13ft 
5 55 
7.47 11. 34 
15.22 
.48 
1.05 
1.59 
2.13 
3-22 
4.32 
1.14 
13H 
5 62 
7.57 ! 11-48 
15-42 
.49 
1.08 
1.64 
2.20 
3-32 
4.45 i 
1.15 
13H 
5 69 
7.66 : 11.64 
15.62 
.50 
6 
1.11 
1.68 
2.26 
3.42 
4.58 J 
1.16 
13H 
5 77 
7.76 ! 11.79 
15.82 
.51 
6* 
1.15 
1.73 
2.33 
3.52 
4.72 
1.17 
14ft 

5 >4 
7.86 ' 11.94 
16.02 
.52 
6i 
1.18 
1.78 
2.40 
3.62 
4.86 
1.18 
14ft 
5 91 
7.96 | 12 09 
16.23 
.53 
6f 
1.21 
1.84 
2.46 
3.73 
4.99 j 
1.19 
14i 
5 98 
8.06 ! 12.24 
16.43 
.54 
6i 
125 
189 
2.53 
3-83 
5-13 
1.20 
14f 
6 06 
8. 16 | 12 39 
16.63 
.55 
1 
1 28 
1.94 
2.60 
3.94 
5.27 
1.21 
14* 
6 13 
8.26 ' 12.54 
16.83 
.56 
1.31 
1 99 
2.67 
4.04 
5.42 
1.22 
14! 
6 20 
8 35 12.69 
17.03 
.57 
6H 
1 35 
2. 04 
2.74 
4 15 
5.56 
1.23 
14f 
6 28 
8.46 i 12.85 
17.25 
.58 
m 
1 38 
2.09 
2.81 
4.26 
5.70 
1.24 
14| 
6 35 
8 56 12 99 
17.45 
.59 
7ft 
1 42 
2.15 
2.88 
4.36 
5.85 
1.25 
15 
643 
8.66 ! 13 14 
17.65 
.60 
7ft 
7ft 
7ft 
1.45 
1.49 
1.52 
1 56 
220 
2.25 
2.31 
2.36 
2.96 
3.03 
3.10 
3-17 
4.47 
4.59 
4.69 
4.81 
6.00 
6.14 
6.29 
6.44 
1.26 
1.27 
1.28 
1.29 
15| 
151 
151 
15* 
13.30 
17.87 
.61 
13.45 
13.61 
13.77 
18.07 
.62 
18.28 
.63 
18.50 
.64 
m 
1 60 
2.42 
3.25 
4.92 
6.59 
1.30 
15| 
15i 
13.93 
18.71 
.65 
7H 
1.63 
2.47 
3.32 
5.03 
6.75 
1.31 
14.09 
18.92 
.66 
7H 
1.67 
2.53 
3.40 
6.90 
1.32 
15H 
14.24 
19.12 
.67 
8ft 
8ft 
1.71 
2.59 
3.47 
5.26 
7.05 
1.33 
15ft 
16ft 
14.40 
19.34 
.68 
1.74 
2.64 
3-56 
5.38 
7.21 
1.34 
14.56 
19.55 
84 
8| 
1.78 
1.82 
2 70 
276 
3.63 
3.71 
5.49 
5.61 
7.36 
7.52 
1.35 
1.36 
16ft 
16ft 
14.72 
14.88 
19.77 
.70 
19.98 
.71 
8* 
8| 
1.86 
1.90 
2.81 
2.87 
3.78 
3-86 
5.73 
7.68 
7.84 
1.37 
1.38 
16ft 
16ft 
15 04 
15.20 
20.20 
.72 
20.42 
.73 
8i 
8| 
9 
1.93 
1.97 
2.01 
293 
2 99 
3. 05 
3.94 
4.02 
4.10 
5. 97 
6.09 
6.21 
8.00 
8.17 
8.33 
1.39 
1.40 
1.41 
SB 
l&ft 
15.36 
15- 53 
15 69 
20.64 
.74 
20.86 
.75 
21.08 
.76 
9k 
n 
9| 
9* 
9f 
91 
9f| 
9H 
2.05 
2.09 
213 
2.17 
2.21 
2.25 
2.29 
2 33 
3- 11 
3.17 
3.23 
3.29 
3.35 
3 41 
! 3.47 
i 3.54 
4.18 
4.26 
4. 34 
4.42 
4.51 
4.59 
4.67 
4.75 
6 33 
6.45 
6.58 
6.70 
6.83 
6.95 
7.08 
7.21 
8.49 
8.66 
8.82 
8.99 
9.16 
9.33 
9.50 
9.67 
1.42 
1.43 
1.44 
1.45 
1.46 
1.47 
1.48 
1.49 
17ft 
15 85 
1602 
1619 
16. 34 
16.51 
1668 
16.85 
17.01 
21.29 
.77 
17ft 
17i 
17| 
17i 
17| 
17f 
17| 
21.52 
.78 
21.74 
.79 


21.96 
.80 
22.18 
.81 
22.41 
.82 
22.64 
.83 


2285 
.84 
10ft 
ioft 
2 37 
2 41 
1 3 60 
3 66 
4.84 
' 4.92 
7 33 
7.46 
9.84 
10.01 
1.50 
13 
17.17 
23.08 
.85 
