To measure your pond for the correct liner size, start by determining its maximum length, width, and depth. Measure the longest point of the pond for length, the widest point for width, and the deepest point from the pond’s bottom to the intended water line.
Once you have these measurements, use the following formula to calculate the liner size: (Length + 2 × Depth + 2 feet) for the length and (Width + 2 × Depth + 2 feet) for the width. The added depth measurements account for the liner reaching down into the pond and up over the edges, while the extra 2 feet on each side provides an allowance for overlap and secure placement around the perimeter.
