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Here is a simple formula to help calculate the dimensions of the pond liner you'll need.
Width - The formula to determine the width of your membrane is 2 x pond depth + pond width + 2 feet = required width.
Length - The formula to determine the length of your membrane is 2 x pond depth + pond length + 2 feet = required length. .
Example: If you have a 20 foot long x 10 foot wide pond that is 6 feet deep at the deepest point, the calculation would look like this:
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