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The Occoquan Reservoir watershed area is 623 sq mi. In a given month, the
watershed received 5.5 inches of precipitation and the average inflow in the reservoir measured
in gages located in the main tributaries was 1,005 cfs. The reservoir has a surface area of
2,100 acres and the average evaporation rate for this month is 4 inches. The outflow due to water
supply for part of Prince William and Fairfax counties population is 26 cfs, and the average dam
overflow was 626 cfs.
a) How many inches of runoff reached the river during this month?
b) Compute the water losses in the watershed due to combined effects of evaporation,
transpiration, and infiltration (inches).
c) What was the change in the storage in the reservoir during this month in inches?
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