From the given data
Energy generated, E = 138.5 MWh
= 138.5*10^6*60*60 J
= 4.986*10^11 J
Let m is the mass of the water in the upper
reservoir.
Energy generated = loss of graviatational potential energy
E = m*g*h
m = E/(g*h)
= 4.986*10^11/(9.8*138.5)
= 3.673*10^8 kg
volume required, V = mass/density
= 3.673*10^8/10^3
= 3.673*10^5 m^3 <<<<<<<<<<----------------Answer
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