Sizing a sump pump depends on the “inflow rate” of water into your basin during peak storm conditions. A pump that is too small will be overwhelmed, while one that is too large will “short-cycle,” leading to premature motor failure. At Basement Expert, we calculate the necessary horsepower and GPH (Gallons Per Hour) based on your foundation’s footprint and local soil conditions. We prioritize high-efficiency, industrial-grade pumps that can handle the specific demands of a PNW winter.