What is meant by 1 inch, 2 inches water in bore well?/ Water yield calculation of bore well.

 When a borewell is drilled, the water yield is described in inches.

But in actuality, what does that mean?

There is a misconception among the general public that those inches are the diameter of the water discharge pipe of the bore well.

 In reality, those inches denote the height of the unrestrained flow of water over a 90° V-notch.

When the borewell water flows through the stream bed having a V-notch, the height of discharged water is measured as H.

The discharge is calculated by the formula

Qact = 8/15cdtan(θ/2)√2g[H⁵/²]

Where,

 H 👉  Height of flowing water in the V-notch.

  θ 👉  Angle of V-notch.

 cd 👉  Coefficient of discharge.

Suppose, if the measurement of height (H) is 1 inch, the borewell water yield is said as 1 inch of water.

Similarly, 1.5 inches, 2 inches, 3 inches, etc. denote the height (H) of discharged water over V-notch.

Now the question is, 

What will be the discharge rate of water through the borewell for different values of 'H' in inches?

The following are the discharge rates in liter/hr. for the different V-notch readings (H) in inches.

Note:

If you want to know the water yield per day, multiply the above values by 24 hours.

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Thank you for going through this article❤. Have a good day 😄.

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