IlW 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 2.0 in. of rain in 30 min on a town of area 26
km2• What volume of water, in acre-feet, fell on the town?