Viewing post #2805469 by MoonShadows

BigBill said: Actually I am off. I remembered what formula I used for figuring on gallons.
Width in inches by length in inches by depth in inches divided by 231 square inches per gallon.
If I did the math right, your pond is 120 x 180 x 32 or about 3000 gallons +/-.

The 10x15 includes the shelf that surrounds the entire pond and is anywhere from 12" to 18" wide and varies in depth from 4" to 12", which would bring down that 3000 +/- gallons quite a bit.

I came up with the 1600-1800 when I took the length and width times the average depth of the deep part plus the length and width times the average depth of the shelf.

Easier to see before I filled it: