880.57 US gallons per minute
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shall assume the 18ft measurement is the diameter, not radius. 18ft = 5.486m = diameter 52in = 1.321m = depth pi x radius(squared) = area of the circle pi x 2.243(squared) = 15.8055 meters squared area x depth = volume in meters cubed 15.8055 x 1.321 = 20.879 meters cubed 1 meter cubed = 1000L 20.879 meters cubed = 20879L 20879L is: 5515.648 US Gallons 4592.738 UK Gallons
A sphere volume = 4/3 pi r cubed
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.
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To calculate the volume, you have to cube the length of its side. In this case, 11 cubed.