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First, you must determine the volume of the water holding basin. If you can't find the figure, it can be calculated based on the USGS measurements, possible available at the USGS website. Then, determine depth of water in the basin at a point, and diviide this term by total possible depth at that point to determine ratio of fullness. If the volume is measured in cubic feet, multiply that number times 7.5 for gallonage. Any other measurement term can be converted to cubic inches. Divide the cubic inches by 231 to get gallonage.

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17y ago

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