Liners are the most economical, versatile materials for pond construction. They are comparable to concrete in durability and length of life, without the expense and labour. Rocks or earth or other permanent materials should protect liner surfaces not covered by water.
Calculating the Correct Size of Liner Required

Width: Maximum Width of Pond + (2 x Maximum Depth of Pond) + 2′ overlap
Length: Maximum Length of Pond + (2 x Maximum Depth of Pond) + 2′ overlap

Example: Pond Size 6′ x 8′ x 3′ deep
Width: 6 + (2 x 3) + 2 = 14′ Length: 8 + (2 x 3) + 2 = 16′ The liner size required is 15′ x 16′

Up to 100′ length by: 5′, 15′, 20′, or 25′ widths. Up to 50′ length by: 30′ width