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Here is a list of great formulas you might need around your pond!
 
Electricity
     Watts = Current (amps) * Voltage (120v / 230v)
     Amps = Power (watts) * Voltage (120v / 230v)
Liner Size
     Length = (depth * 2) + Length + 3
     Width = (depth * 2) + Width + 3
Pump Size per Pond Gallons
     Gallons Per Hour (GPH) = Volume * 2
Surface Area
     Square Pond = Length * Width
     Circular Pond = Top Diameter * Bottom Diameter * Total Depth * 5.9
     Oval Pond = (Oval Length * .5) * (( Oval Width * .5) * 3.14
Water Volume
     Square or Rectangular Pond = Length * Width * Average Depth * 7.48
     Circular Pond = Diameter * Diameter * Average Depth * 5.9
     Oval Pond = Length * Width * Depth * 6.7
Average Depth = (Shallowest Point + Deepest Point) / 2
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