This invention addresses the stormwater backup damage to finished basements and below-grade construction that occurs during power outages when the AC pump cannot operate and DC battery backup pumps are unable to operate for long duration. Even during harsh storm conditions, however, municipal water supplies continue to flow through pipes separate from those that drain stormwater.
This invention makes use of the power available from a continuous 30-50 psig water supply pressure to run a sump pump that can produce approximately 17-29 feet of head — more than the 10-12 feet required in most basement applications. The typical 5-6 gallon-per-minute flow rate into the upper actuator results in a 20-24 gallon-per-minute gross discharge flow rate from the lower pump chamber. Such a water-driven water pump can assure that stormwater does not back up into below-grade building spaces during power outages of any duration.
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