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?

Question

Mathematics

Mccann

5 December, 08:21

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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Alia · Answer 1

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