If 75 feet is the circumference of the pond then its radius works out as 12 feet rounded to the nearest whole number and its surface area is pi*12^2 which is 144*pi square feet.
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The surface area of the pond is measured in square meters.
Volume = (surface area) x (depth) = 217,800 cubic feet = 1,629,257.1 gallons (rounded)
1409.23 gallons. Assuming that your pond is a cylinder shaped pond, then the formula pi * radius squared * height would work in this situation. 20 inch= 1.66 feet = height. pi * 6 feet squared * 1.66 feet = 188.4 feet cubed. 1 foot cubed = 7.48 gallons roughly. 188.4 * 7.48 = 1409.23.
If the surface is 9-ft by 16-ft, and the sides are straight all the way down,then the amount of water in it is 1,077.2 gallons for every 1 foot of depth.
598 Imperial gallons, approx.