Before you begin, subtract 2 feet from the length and width of the liner, this part of the liner will be used for overlap on the pond edges. The Bigger the liner, the deeper the pond should be. Well, Not yet. What if I told you that we can still add a few more gallons to the pond. Heres how, by softening the edges all around the bottom of the pond to a 45 degree angle, we can gain an additional 6 inches to the depth of the pond.
Lets calculate the gallons difference.
That's a gain of 172 gallons. Lets try this with a larger pond. Thats a gain of 1207.5 gallons.