Formulas and Sizing Charts
Click on a title below to view the formula or chart.
Round or Oval Body of Water
Dia. x Dia. x Avg. Depth x 5.9 = Gallons (US)
Example:
24' pool with an average depth of 3.5'
24 x 24 3.5 x 5.9 = 11,894 Gallons (US)
Square or Rectangular Pool, Pond or Lake
Width x Length x Avg Depth x 7.5 = Gallons (US)>
Example:
20' x 40' pool with an average depth of 5.5'
20 x 40 x 5.5 x 7.5 = 33,000 Gallons (US)
Length = (Depth x 2) + Length + 2 feet
Width = (Depth x 2) + Width + 2 feet
Example:
For a finished pond of 8' x 10' x 2.5'
purchase a pond liner that measures at least
Length = (2.5 x 2) + 10 + 2 feet = 17'
Width = (2.5 x 2) + 8 + 2 feet = 15'
(Watts/1000) = kwh x 8760 (hrs/yr) x .10 (kwh cost)
= Energy Cost per Year
Example:
(345 Watts/1000) = .345 kwh x 8760 x .10 = $302.22/year
| Width of Waterfall |
Water Depth Over Falls | |||
|---|---|---|---|---|
| 1/4" | 1/2" | 3/4" | 1" | |
| 1" | 4 | 13 | 24 | 36 |
| 2" | 9 | 26 | 47 | 73 |
| 3" | 13 | 39 | 71 | 109 |
| 4" | 18 | 51 | 94 | 145 |
| 5" | 23 | 64 | 118 | 181 |
| 6" | 27 | 77 | 142 | 218 |
| 7" | 32 | 90 | 165 | 254 |
| 8" | 36 | 103 | 188 | 291 |
| GPM Over Falls | ||||
| Item | Loss of Head (ft.) |
|---|---|
| Skimmer/drain | 0.2 |
| Suction Line | 2 |
| Suction Manifold | 2 |
| Backwash Valve | 12 |
| Filter | 10 |
| Return Plumbing | 2 |
| Return Fittings | 1 |
- Values are approximate and may vary by make and model
- This is not a complete list, additional items such as heaters will need to be accounted for on a case by case basis.
| GPM | gallons per minute |
| GPH | gallons per hour |
| LPM | litres per minute |
| PVC | Poly Vinyl Chloride |
| PEO | pump end only |
| EPDM | Ethylene Propylene Diene Monomer |
| TDS | total dissolved solids |
| PPM | parts per million |
| MBT | male buttress thread |
