1359.2 litres, approx.
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not square litres but square metres 80 x 0.30482 = 7.432 metres2 to work out litres need to know the depth, depth in metres x 7.432/1000 will give litres
It's unlikely that your pond has vertical sides and is 3' deep everywhere, but if it were, it would hold 18 * 7 * 3 = 378 cu. ft. of water. Converting the dimensions to metric at the start makes everything easier. 378 * (12^3) * (2.54^3) give you the number of cc's, dividing that by 1000 gives you the number of liters (10703). Dividing THAT by 3.7854 (liters/gallon) gives you about 2828 gallons. A typical pond, however, probably slopes from very shallow at the periphery to maximum depth near the center. This means it likely holds 30 - 40% less than if it had steep vertical sides and a consistent depth (like a typical above-ground pool). Your pond is probably on the order of 1500 - 1900 gallons.
1 acre = 43,500 ft2vol = area * depth = 43,500*5 = 217,500 ft31 ft3 is approx. 7.48 gallons217,500 ft3 * (7.48 gal/ft3) = 1,626,900 gallons
lenght times width times height = volume so whats 2 times 1 times 500?
Litres.