Word: cubic
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...feet) and spill it into the Coulee. This turbine-pump combination, using a river's energy to raise part of its water over its own high banks, is the key engineering trick that frees irrigation from gravity. Its efficiency is about 80%, i.e., one cubic foot of water falling 100 feet generates enough electricity to pump another cubic foot 80 feet above the reservoir...
...with the proportions of a cathedral nave. Two are already installed, driven by the most powerful (65,000 h.p.) motors in the world. Each can pump enough water (one billion gallons a day) to meet the needs of New York City. All twelve pumps together will lift 16,000 cubic feet per second-close to the average flow of the Colorado River...
...acre-foot equals 43,560 cubic feet of water, enough to cover one acre one foot deep...
...weight of water is 62.4 pounds per cubic foot. What is the weight of the water that fills a rectangular container 6 inches by 6 inches by 1 foot? (a) 32.2 pounds, (b) 15.6 pounds, (c) 10.4 pounds, (d) 12.48 pounds, (e) none of these. (For answers see footnote...
...cubic mile of sea water there is about $93 million worth of gold, but no one has yet figured out how to extract it profitably...