Liner width = pond width + (max. pond depth x 2) + 1 ft.
Liner length = pond length + (max. pond depth x 2) + 1 ft.
Example: A pond 5 ft. wide, 10 ft. long and 2 ft. deep will need a liner 10 x 15.
Note: pond liner comes in widths of 10', 15', 20' and 30', so this will be one of the dimensions of the liner you purchase.
Want a more precise measurement? Click here to learn how to accurately measure your excavated pond.
Pond Volume:
This formula will tell you approximately how many gallons of water your pond will require so that you can choose the right pump.
Circular Pond:
Gallon volume = π x r2 x average depth x 7.48
Example: an 8 ft. diameter (4 ft. radius) pond that is 2 ft. deep will hold about 752 gallons.
Irregular-Shape Pond:
Gallon volume = pond width x pond length x average depth x 7.48
Example: a pond 5 ft. wide, 10 ft. long and 2 ft. avg. depth will hold about 748 gallons.
Other Pond Formulas
Quantity (approx.) of rocks to use in a 2 foot deep pond:
Length x Width / 65 = Qty. of boulders used in the pond (tons)
Example: 10 ft. x 5 ft. / 65 = 0.77 tons of boulders
Quantity of ¼" to 3" gravel to use in pond:
Multiply the qty. of boulders (tons) x 0.45
Example: 0.77 tons of boulders x 0.45 = 0.35 tons of gravel
Quantity of boulders to use in a stream:
¾ ton per 10 ft. of stream length
Quantity of ¼" to 3" gravel used in the stream:
½ ton per 10 ft. of stream length
Boulders for Facing:
You'll need approximately ¾ to 1 ¼ tons of boulder to build around the face of your biological filter
Fish:
1" (length) of fish per 1 sq. ft. of water surface area
