IMHO every boat needs at least two bilge pumps in addition to the manual one. You have the "routine" pumps at the low spots and the biggest one you can afford/fit for emergencies. It does not need to be at a low point - just low enough to do some good. 500 GPH pumps fit between my keel bolts and down the sump, but both of them together could never keep up with one hose off a seacock. I am rigging the "big pump" with a loud alarm too.
Joe Della Barba Coquina C&C 35 MK I
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