You're right, about low lift, and low pressure. I wonder
what's the max head for these pumps?

--
Christopher A. Young
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A bilge pump isn't going to be good at doing that. To water
a lawn you need a pump designed to develop some
pressure so you can deliver it through a spray head, nozzle,
etc. A bilge pump is designed to move as much water
as possible at very low pressure/lift/

Coupled with a battery and battery tender, it would make
a sump pump backup that could move a reasonable
amount of water. But even doing that, at 800gph it's
not equal to a traditional sump pump.