Need details for selection and installation of water pump in a 4 storied apartment

Hello

I live in a typical Delhi Co-op Apartments, with individual water tanks on the terrace for everyhouse. Our Society has both the municipal water supply as well as bore water pumping facility. The municipal water flow is however, very low in pressure; and sometimes water does not reach the overhead tank. So we have decided to get a water pump.

My flat is on the second floor out of the total 4 (ground, first, second, third, terrace) floors in the building.

I would like to know the specifications of the water pump  and also the location where it needs to be installed

Please advice

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