Is water of 2.5 inches from borewell adequate for an 8 acre plot with drip irrigation?

Hello,

I am considering an 8 acre property with drip irrigation, according to the seller the land is sustained by a borewell with 2.5 inches water.  Does that sound adequate?  I feel it is not enough to even pump it up, but the seller insists thats very good by Indian standards, need information on this.

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