A 10-acre pond is located within a 640-acre watershed. The pond is lined with compacted class so seepage is negligible. During a thirty day period, the rain was 2.5 in. The average streamflow into the pond was 0.45 ft3 /s and out of the pond was 0.1 ft3 /s. By the end of the 30 days, the water level in the pond had risen 1.9 inches. Determine the evaporation over the 30 days in inches of water.

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Q1)A storm water retention pond following a 4-hour rainfall event with 2-in accumulation. The contributing watershed area is 20 acres, of which 2 acres in the pond. The pond has a rectangular geometry. The initial depth of water in the pond is 5 ft. The soil of the watershed on average is pasture type in good condition. The pond drains by infiltration through the bottom (fully effective) and sides of the pond at the rate of 2 in/hr. The effective area for infiltration through the sides of the pond is 2000 ft. What is the depth of water in the pond 12 hr after rainfall ends? Assume runoff has ended by this time?