Our shower sump, in our 1984 boat, is open (a loose cover) but is quite deep. There would have to be about 12" of water in the bilge for the sump to operate as a back-up bilge pump. And that would be a LOT of water! Similarly, there would have to be about 12" of water in the shower sump before the bilge pump could take over. I made a new 3/4" plywood cover for the sump to replace the 1/2" thick one that had been left elsewhere in the boat. Makes grovelling in the forward part of the ER less uncomfortable.
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