Hydraulic Dump
October 18th, 2005
another urgent physics 101 q?
Hydraulic engineers in the United States often use, as a unit of volume of water, the acre-foot, defined as the volume of water that will cover 1 acre of land to a depth of 1 ft. A severe thunderstorm dumped 2.5 in. of rain in 30 min on a town of area 26.8 km2. What volume of water, in acre-feet, fell on the town? Give the answer to three significant figures
1 acre = 4046.85 m^2 = 0.00404685 km ^2
26.8 km^2 = 6622.5 acre^2
2.5 in. over this area corresponds to
2.5 x 6622.5 / 12 = 1379.7 acre-feet
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