Sunday, July 27, 2014

Borewell Yield Measurement

Borewell Yield Measurement
A common way to describe the yield of a new borewell is in ‘inches’ measured by the free, unrestrained flow of water from a borewell over a 90 degree ‘V’ notch. The basic principle is that the discharge is directly related to the height of the water level  from the bottom of the V notch.

V Notch Weir.GIF
h - Height of water level from the bottom of the V

Based on certain equations and formulae, the height ‘h’ in inches is converted to discharge rate in litres per hour.
 
The following table indicates the conversion of the yield in ‘inches’ to a discharge rate in litres per hour.

V-Notch Reading in Inches
Approximate Discharge Rate in l.p.h.
Class
1/4
95.4
3/4
261
Low Yield
1
597
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
Superlative Yield
6
52,644.00
6 1/4
58,372.00
6 1/2
64,373.00
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


Source:
http://www.lmnoeng.com/Weirs/vweir.php

6 comments:

john son said...

Your information about borewell is really useful. Thanks for sharing this informative article.
Borewell Contractors in Chennai

Venkat G said...

Dear Sir/Madam,

Your site is giving very good information about water, It is very useful in our dailylife, Now a days due to lack of sufficient water so many people are facing many problems. In this circumstances Borewells in Hyderabad is doing some help to dig and get water. Some of the Borewells in Hyderabad.

Venkat
www.borewellshyderabad.blogspot.com

Borewells in Hyderabad

Abhi Ram said...

thanks for sharing nice blog of borewell

DIVYASHAKTHY SOFTTECH INDIA PVT LTD said...

Great post.
I think best information here. I like it very much
We all are appreciating your blog.
Nano catalytic instant water converter

Unknown said...

Sir common people talks about that i am obtaining 2 or 3 inches of water what do you mean by that inches

Hemant Vashisht said...

Thanks a lot. Very useful information