Manufacturers are required to provide a sump pump performance curve for each sump pump model. The performance curve tells the consumer how many gallons of water can be pumped from the pit at a specified height during a specified time period. Buying a new sump pump by this measurement is more accurate than buying by pump horse power because some 1/2 HP pumps can move as much water as 3/4 HP. It is important that you know how much water enters and leaves your pit during a heavy rainstorm and what the vertical height is of the discharge pipe system. Using these measurements will enable you to find the size pump you need. If you are confused and need more detail, try these instructions on how to use a sump pump performance curve.
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