Area of the valley, *A* = 97280 km^{2}

Level in the rise of water in the valley, *h *= 10 cm = (10/100000) km = (1/10000) km

Thus, amount of rain fall = *Ah* = 97280 km^{2} × (1/10000) km = 9.828 km^{3}

in 14 days 9.828km3 in 1 day 0.702km3

Volume of water in each river = length × breadth × height = 1072 km × 75 m × 3 m = 1072 km × (75/1000) km × (3/1000) km = 0.2412 km^{3}

Thus, the volume of water in three rivers = 3 × 0.2412 km^{3} = 0.7236 km^{3}

and amt of rainfall= 0.702 km3 which is approximately equal

This shows that the amount of rain fall is approximately equal to the amount of water in three rivers.