FORMULAS AND CONVERSIONS

Here are a few simple formulas and conversions that may help you in planning your water garden and selecting proper equipment. Formulas are approximate figures only.

To Calculate Size of Pond Liner:
Length = (Depth x 2) + Length + 3 feet
Width = (Depth x 2) + Width + 3 feet

Example: For a finished pond of 8’ x 10’ x 2.5’, purchase a pond liner which measures at least 16’ x 18’.
Length = (2.5 x 2) + 10 + 3 feet = 18’
Width = (2.5 x 2) + 8 + 3 feet = 16’

To Calculate Volume of Pond
Length x Width x Depth x 7.48 = Pond Gallons
For a Round Pond: Top Diameter x Bottom Diameter x Height x .785 x 7.48 = Gallons
Example: 12’ x 10’ x 2’ x 7.48 = 1792.8 Gallons.

To Figure Pump Requirements
Pumps should circulate the pond’s water once every two hours at minimum. If the pond has excellent biological filtration, the pond could recirculate every three hours.
Pond Volume / 2 = Pump Size
Example: 500 Gallon Pond / 2 = 250 GPH Pump

To Figure Electrical Consumption
Watts / Volts = Amps
Example: 345 Watts / 115 Volts = 3 Amps