All components in the circulation system, from the skimmer and main drain to the return inlets, must be factored into TDH calculations. Match the TDH of the system with the TDH of the pump. The TDH will affect flow rate and therefore is an important factor in selecting the right pump. Resistance is applied throughout the system, such as when water flows through elbows, fittings, valves, equipment and even through straight lengths of pipe. Total dynamic head: Total dynamic head (TDH) is the sum of the resistance encountered by water flowing through the pool’s circulation system. (To calculate the flow rate, see “Formulas.”) The recommended turnover time varies depending upon region and individual preferences, but eight hours can be considered an adequate turnover time. It is tied into the turnover rate, that is, the amount of time it takes to move the entire capacity of the pool through the system. The flow rate is simply how many gallons of water per minute the pump moves. Simply multiply the volume of the pool by 7.48.įlow rate: Now it’s time to determine the flow rate needed to circulate the pool water in a timely manner. Pool capacity: Next, determine the pool capacity (the number of gallons it will hold), keeping in mind that there are 7.48 gallons in 1 cubic foot of water. To figure the volume of oval, circular, square or rectangular, and irregular or free-form pools, see “Formulas” (below) or use a smartphone app.
(If you must estimate, be sure not to underestimate.) For simplicity, make your measurements in feet and tenths of feet to keep the calculations in easy decimal form.Naturally, the pool’s shape will determine which equation to use to calculate the volume in total cubic feet. Don’t be too concerned about absolute accuracy because close estimates will be adequate for these equations. If you don’t have the specs handy, measure the pool.
Pool volume: To determine pool volume (the amount of space measured in cubic feet), you’ll need the basic pool dimensions. Pool volume x 7.48 = pool capacity in gallonsįlow rate per hour ÷ 60 = flow rate per minute * To find the average depth of a slope-floored pool, measure the depths at both ends, add them together and divide by 2. To be more precise, measure the pool with a planimeter,īut that’s not necessary a close estimate is all that’s needed. Radius x radius x 3.14 (pi) x average depth = pool volumeįree-form or irregular pool: Use the equation for an oval or rectangle,Īs needed. Length x width x average depth* = pool volumeġ/2 length x 1/2 width x 3.14 (pi) x average depth = pool volume
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