For ideal construction
Constructing a pond with liner offers an infinite variety of design possibilities. The larger the pond or the more stress to which the pond is subjected, the thicker the liner should be.
Calculation Aid for Liner Requirements
Length + 2 x Depth (deepest point of excavation) + 2 x 20 inches = Length of the liner
Width + 2 x Depth (deepest point of excavation) + 2 x 20 inches = Width of the liner