Question

A mean draft is produced from a drainage area of 250 km2 to satisfy the needs of 1.5 million people living in a nearby city. The water consumption is estimated to be 120 l/c/d. At the flow line, the reservoir is estimated to cover about 900 hectares. The annual rainfall is 60 cm, the mean annual runoff is 15 cm, and the mean annual lake evaporation is 38 cm. Find the net gain or loss in storage. Calculate volume in cubic meters.

Answer 1