How to plug outlets in underground tank in Karla, Lonavala to get sufficient water ?

dear sir

We used to get a lot of water throughout the year for the first two years, suddenly there seems to be a shortage of water in the borewell. we have got the pump (3 hp Pluga ) removed and serviced but it has not helped as an xpert says that another bore may have been made on the same vein.

how do we plug the outlets in our u/g tank so that we could get sufficient water again ???

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