Tubewells in Alluvial Soil: Method of choice?

I need some guidance regarding development of borewell.

In tubewells in Alluvial soil, what method of development is better-
1) Air compressor or 2)Over Pumping Unit.

 If Air compressor, then how to select the parameters of Air compressor (like Psi & cfm) depending on the depth/dimension of tubewell.
 Similarly, for O.P.unit., the selection criterion. Kindly advise.

Shivam
info.luckyconstructions@gmail.com
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