Mar. 6 f 1916 
Flow through Weir Notches 
1081 
Table VIII .—Discharges {in cubic feet per second) for Cipolletti weir notches as shown 
by curves plotted from experimental data , and discharges computed by formulas on 
pages 1074 and 1080 
Head. 
Feet. 
o. 
1.0050-foot notch. 
0.300 
•555 
.866 
z. 218 
1.622 
2.075 
a- 565 
3 * III 
3-695 
0.302 
• 563 
.874 
1.23 
1.63 
2.08 
2- 57 
3- 
3-69 
be d 
0.303 
• 558 
.866 
1. 222 
1.626 
2.077 
2.571 
3 - hi 
3- 697 
1.5028-foot notch. 
2.0002-foot notch. 3 
.0011-foot notch. 
4.0058-foot notch. 
0-455 
.829 
1. 280 
1.798 
2.370 
3.004 
3- 706 
4. 462 
5- 261 
6- 137 
7.060 
0.450 
.83 
1.28 
1. 80 
3-37 
3.02 
3- 7i 
4.46 
5- 26 
6. 12 
7-03 
0.451 
. 827 
1-275 
I- 79i 
2.369 
3-009 
3- 704 
4*458 
5- 270 
6.138 
7.063 
o. 600 
1.109 
1.694 
2- 375 
3- 141 
3-953 
4*845 
5- 815 
6. 845 
7. 941 
9.110 
o. 600 
1.10 
I. 69 
2- 37 
3- 13 
3- 95 
4- 85 
5- 82 
6.86 
7. 96 
9.12 
o. 602 
1.100 
1.694 
2.370 
3-125 
3- 958 
4- 859 
5- 831 
6. 873 
7-983 
9-159 
a 902 
1.647 
2- 535 
3- 530 
4- 650 
5- 870 
7-185 
8.576 
10. 078 
ii -655 
13*359 
o. 900 
1.64 
2. 53 
3- 53 
4.64 
5 - 86 
7.18 
8-59 
10. 08 
11.68 
13- 36 
a 898 
1.639 
2.519 
3- 5i5 
4.624 
5- 839 
7- 150 
8. 557 
10.057 
11. 647 
13- 325 
1. 206 
2.193 
3.360 
4-705 
6. 179 
7. 800 
9- 537 
11. 392 
I3-376 
15 - 425 
I . 20 
2.19 
3 - 36 
4* 70 
6.18 
7 - 78 
9- 52 
11. 38 
13 * 34 
15-43 
I. 199 
2.188 
3-357 
4. 684 
5-156 
7- 763 
9.492 
11.348 
13-320 
IS- 404 
The differences between the discharges through the 0.5-foot Cipolletti 
notch obtained from the curves plotted from the experimental data and 
the discharges computed by the formula for the 0.5-foot rectangular 
notch were determined and plotted logarithmically against the heads. 
The straight line representing these differences has the equation 
D=o.$ 6 H 2 ' 55 . By adding the term 0.56H 2 * 55 to the formula for the dis¬ 
charge through the 0.5-foot rectangular notch, the formula for the dis¬ 
charge through a 0.5-foot Cipolletti notch becomes 
Q^i^eH^ + o.sSH 2 ^ 
NOTCHES WITH SIDE SIvOPES OE I TO 3 AND I TO 6 
Experiments were made with notches having crest lengths of 2 feet 
and side slopes of 1 to 3 and 1 to 6, respectively. Since notches of only 
one length were used in each set of experiments, no general equations 
were deduced for notches of these types. The discharges obtained in 
the experiments for heads over 0.4 foot are shown graphically in figure 
11. Discharges with heads less than 0.4 foot are approximately the 
same as those given in Tables II and VI. 
