We’re being asked to **determine the volume of Lake Erie in acre-feet **which have a** total volume=116mi ^{3}**.

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

**1 mi = 5280 ft****1 acre = 43560 ft ^{2}**

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.

How many acre-feet are in Lake Erie (total volume=116mi^{3})?

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