V-Notch Test
APPROXIMATE YIELD IN L.P.H., (Litres Per Hour) for a
90° "V"- Notch.

Yield = The continuous unrestrained flow of Water from a Bore-Well.


V-Notch Test Scale or Conversion Table (Accuracy 60% to 70%)

V-Notch Reading in Inches
Approximate Discharge Rate
in l.p.h.
Class
1/2
95.40
3/4
261.00
Low Yield
1
597.00
1 1/4
1,045.00
1 1/2
1,650.00
Average Yield
1 3/4
2,425.00
2
3,382.00
2 1/4
4,558.80
High Yield
2 1/2
5,919.00
2 3/4
7,501.00
3
9,329.00
3 1/4
11,402.60
Very High Yield
3 1/2
13,720.00
3 3/4
16,284.60
4
19,148.00
4 1/4
22,285.60
4 1/2
28,695.20
4 3/4
29,459.20
5
33,350.00
5 1/4
37,914.00
5 1/2
42,551.00
5 3/4
47,461.00
6
52,644.00
6 1/4
58,372.00
6 1/2
64,373.00
Superlative Yield
6 3/4
70,919.00
7
77,464.00
7 1/4
84,557.00
7 1/2
92,195.00
7 3/4
1,00,105.00
8
1,08,288.00
     
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