We’re being asked to **convert 4 acre feet** into cubic feet.

To do so, we need the following ** conversion factors**:

**1 mile = 5280 feet**

**1 mile ^{2} (square mile) = 640 acre**

The volume of water used for crop irrigation is measured in acre-feet, where 1 acre-foot is the amount of water needed to cover 1 acre of land to a depth of 1 ft.

If there are 640 acres per square mile, how many cubic feet of water are in 4.0 acre-feet ?

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