The average surface flow of a reservoir in the month of June is 20 km². In the same month the avg. rate of inflow is 10 m³/s; out flow rate is 15 m³/s, monthly rainfall is 10 cm, monthly

Problem 2.2: What reservoir capacity is required to produce a uniform yield of 72*10° m³/year for a site where the monthly inflows during a critical flow period are tabulated as below? All monthly flows are in 106 m³/month. Years O 1 2 3 N D 18 8 16 16 21 4 8 15 18 Answer: V = 51*106 m³. J 27 9 35 F M A 13 30 10 2 3 4 15 19 8 M 5 1 5 J 4 0 0 J 3 0 2 A S 0 0 0 0 5 6

6. Runoff from a 200 mile² catchment drains into a reservoir than has an average surface area of 4000 acres. The reservoir is to be used for municipal water supply. Annual rainfall over the watershed is 40 inches and the annual runoff is 2 inches. Evaporation from the reservoir averages 40 inches per year. If the surface area of the reservoir is roughly constant with depth, how much will the reservoir depth change in one year?

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