fourth year
Anytime the pump is the total drainage for a building, I recommend a duplex system with alternating operation, high water override, high water alarm bell and light, and as a bonus, if there is a possibility of flooding in the event of pump or power failure, a valve on the water inlet tied to the high water alarm to prevent any water usage when the pump will not or cannot operate. The basin does not have to be particularly special since the gas tight seals on the lid will also keep water out. It should be tall enough to come to ground level to facilitate service and repairs. The controls have to be protected from the weather, however, either by being in raintight enclosures or installed remotely in the building.
