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 36 inches and the annual runoff from the catchment is 12 inches. Evaporation from the reservoir averages 40 inches per year. The municipal water demand equals 100 million gallons per day. - Compute the change in volume (acre-ft) then the change in depth (ft) of water stored in the reservoir over one year