Need details on how to measure the quantity and yield of borewell

We have drilled a borewell 5 years ago and have got good yield of water at 160ft. We will be now getting municipal water supply. Currently the borewells in the neighbourhood are yielding water only at a depth of 300 - 400ft. 

We would like to know how to measure the quantity and yield of borewell. Any information in this regard will be very helpful.

 Thank you.

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