This paper presents new hydro-gravity water pumping device, with necessary design equations and steps to design mechanical and hydraulic features of the device (pump). It can be called as hydro-gravity pump based on the its power sources since its wrapping feature is driven by waterpower whereas its unwrapping feature is driven by torque due to the of mass under influences of gravity. It uses waste water (any source of water that may not be useful for a proposed purpose) as its power source to lift useful water for a proposed purpose and it can be installed at any suitable place needed, and the working principle of pump helps to avoid occasional and technical loses of useful water for proper utilization of available useful water. The objective of this study is to propose cost effective pump for water pumping facilities, so as to achieve the required advantages aforementioned. The main working parts of the pump are waterwheels, shaft and belt, along that the working principle of the pump involves rotary motion of shaft and waterwheels, and reciprocating, wrapping and unwrapping motion of the belt. The major areas of studies to carry out this particular research work are impulse-gravity overshoot waterwheel, law of conservation of energy, design of machine elements such as shaft and bearing, torque and bending moment. The finding of this paper helps to fix dimension of pump parts and to evaluate its theoretical performance. Keyword: impulse-gravity overshot waterwheel, law of conservation of energy, torque, bending moment, design of machine elements.

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