To ensure a long-lasting and leak-free pond you should use the proper pond liner. Using a liner ensures that your waterfall or free-form pond will hold water for years. The flexible membrane, when installed properly, will last for decades.
To calculate the size of pond liner you need you should use this pond liner calculation:
Length + (2 x the depth) + (2 x 1 ft overhang) = length needed
Width + (2 x the depth) + (2 x1 ft overhang) = width needed
If you have questions about the pond liner please contact us.