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Hydraulicists often express rainfall in acre-feet. this is the amount of water required to cover an area of one acre to a depth of one foot. there are 640.0 acres in a square mile, and 5280 feet in one mile. how many cubic feet are there in one acre-foot?

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  1. 25 July, 07:14
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    1 sq. mile

    = (5280 ft) ^2

    =27878400 ft^2

    Since 1 sq. mile contains 640 acres, therefore

    1 acre

    =27878400 ft^2 / (640 acres / sq. mile)

    =43560 ft^2/acre

    This means the volume of 1 acre-foot

    = 43560 ft^2 * 1 ft

    = 43560 ft^3
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