Runoff from a 250-square mile catchment drains into a reservoir that has an average surface area of 4500 acres. The reservoir is to be used for a 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 over one year? (For the exchange: 1 inch = 2.54 cm, 1 acre = 4.05 × 103 m2, 1 mile = 1609 m.)
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