T&T: why is there a shower sump?

[Jim Ague]

> why do i have a sump anyway?  because the shower drain is so low that i
> would siphon seawater back into the boat?
> would a high loop with a vent be an alternative?

If the sole of the shower stall were significanly higher than the waterline, 
then I guess a sump wouldn't be necessary. I have no idea what 
"significantly" means. Five feet? What about heeling?

If you had a high loop, and if I understand the concept, how would you keep 
it primed so that it would act like a siphon? I just don't think this works.

Perhaps the solution you're looking for is an outside, on-deck shower.

-- Jim Ague