Mar. 6,1916 
Flow through Weir Notches 
1077 
Table VI .—Discharges (in cubic feet per second) through Cipolletti weir notches —Con. 
Head. 
i-foot crest. 
iK-foot crest. 
2-foot crest. 
3-foot crest. 
4-foot crest. 
Feet . 
1-35 
I. 36 
i -37 
1. 38 
i- 39 
Inches. 
16* 
16. 01 
16. 19 
16.37 
16.56 
16.7s 
21. 06 
21 29 
7 t e? 
21. 78 
22. 02 
1.40 
1. 41 
1.42 
i- 43 
1.44 
1 6U 
l6. CiA 
22. 27 
idU 
i 7 -13 
17.32 
T 7 . CT 
22, 51 
0.0. e 
17A 
17k 
23. 00 
23-25 
17 . 70 
i -45 
1.46 
1. 47 
1. 48 
1.49 
1. 50 
17 H 
17K 
T-7H 
17 X 
17 yi 
18 
17.89 
l8. 08 
l8. 28 
t8. 47 
2 3 - 75 
24 00 
24.25 
24. 5° 
24. 75 
18. 66 
18.85 
The discharges through the Cipolletti notch, having a nominal crest 
length of 0.5 foot, did not follow the same law as those through the longer 
notches, possibly for the reasons noted on page 1067 for the 0.5-foot rec¬ 
tangular notch, and the use of such notches should be discouraged in 
favor of the 90° triangular notch, which measures small discharges more 
accurately. 
The following formula represents the flow through the 0.5-foot Cipol¬ 
letti notch, but is stated here only for technical reasons: 
Q = 1. 593 # 1 - 628 (I + Soom^)°- 587H2M 
Comparison or the Cipolletti Formula and the New Formula 
The discharge values computed by the Cipolletti and new formulas 
are shown in graphic form in figure 10 and in tabular form in Table VII. 
