Estimate the constant rate of withdrawal from a 1375 hectare reservoir in a month of 30 days during which the reservoir level dropped by 0.75 m in spite of an average inflow into the reservoir of 0.5 cum/day. During the month the average seepage loss from the reservoir was 2.5 cm, total precipitation on the reservoir was 18.5 cm and the total evaporation was 9.5 cm. O a. 6.191 cu.m./s O b. 5.191 cu.m./s O c. 9.161 cu.m./s O d. 6.911 cu.m./s

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?

During a particular 30-days period, the streamflow flowing into a reservoir averaged 5.0 cubic meter per second. Water supply withdrawals from the reservoir averaged 136 mgd (million gallon per day). The only other outflow from the reservoir was 9.4 cm of evaporation from the reservoir water surface. The average water surface area of the reservoir during the 30 days was 3.75 sq.km. The reservoir had 12,560 ac-ft of water in storage at the beginning of the 30-days period. Determine the storage content at the end of the 30 days in units cu.m.

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