First source of water at 250-300 feet and no other source upto 1050 feet - Water yield is .5 inch - Should I install a motor ?

Dear Sir,
Recently I got a borewell drilled at my site in Parappana Agrahara (Hosur road), Bangalore, casing upto 40 feet. I have got the first source at around 250-300 feet, but after that we did not get any sources till 1050 feet. As per the borewell person he said i have around 0.5 inch yield in the borewell. Need your suggestion if I should to invest further on this borewell (installing motor and other stuff?). Any how I am going to scan (through some experts) the borewell before investing. Please suggest.

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