Two water tanks of area 2 m 2 and 0.8 m 2 have a common partition wall. A circular orifice of…

Two water tanks of area 2 m2 and 0.8 m2
have a common partition wall. A circular orifice of diameter 10 cm allows flow
of water between the tanks. If initially the level of the water in the larger
tank is 1.5 m above that in the other, determine the time required for the
difference in water surface elevations to reduce to 0.5 m. The coefficient of
discharge of the orifice can be taken as 0.7.