V-Noch Discharge with End Contractions Header Graphic

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V-Noch Image

(The distance "O" on either side of the weir must be at least 3/4 L)

DISCHARGE OVER WEIR GALLONS PER MINUTE
HEAD "H"
INCHES
10TH OF FOOT
1
.083
1.25
.104
1.5
.125
1.75
.146
2
.167
2.25
.188
2.5
.208
2.75
.229
3
.250
3.25
.271
3.5
.292
3.75
.313
4
.333
4.25
.354
4.5
.375
4.75
.396
5
.417
5.25
.437
5.5
.458
5.75
.479
6
.500
WEIR ANGLE
22.5 degrees
30 degrees
45 degrees
60 degrees
90 degrees
0.4
0.5
0.8
1.2
2.0
0.8
1.0
1.6
2.2
3.9
1.2
1.7
2.6
3.5
6.1
1.8
2.4
3.8
5.2
9.1
2.6
3.4
5.3
7.3
12.7
3.4
4.6
7.1
9.8
17.1
4.4
5.9
9.1
12.7
22.0
5.6
7.5
11.6
16.1
27.9
7.0
9.4
14.4
20.1
34.8
8.7
11.4
17.9
24.9
43.1
10.3
13.8
21.3
29.6
51.3
12.3
16.4
25.3
35.2
61.0
14.4
19.2
29.6
41.1
71.2
16.7
22.3
34.5
47.8
83.0
19.3
25.8
39.8
55.3
95.8
22.1
29.5
45.6
63.3
109.9
25.2
33.6
51.8
71.9
124.8
28.3
37.8
58.4
81.1
140.6
31.9
42.5
65.6
91.1
158.0
35.6
47.4
73.3
101.7
176.4
39.7
53.0
81.8
113.6
196.9

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