Crossed drain hoses and larger seacocks.
Dear friend, To add to what David just shared, I increased the single cockpit scupper drain seacock that two drain hoses fed into from 1 2.5" to 1.5" and added a second 1.5" seacock while I was at it. The hoses I had at the time weren't long enough to crisscross so I left them port to port and starboard to starboard. I might add that prior to my adding the second 1.5" seacock, both hoses led to the smaller 1.25" seacock. Anyway, something interesting resulted. Now when on a particular point of sail with the boat heeled to one side or another to say, 20+ degrees, there's a much greater tendency for water to back flow through the grate and into the cockpit to larger degree than the old way. I'm not talking a flood of water but enough to clearly note a greater amount than before. Crisscrossing the hoses is something I have on my To Do list, it's just getting around to it that's stopping me. It would be nice not to have soggy Genoa sheets and wet shoe soles once again though. Glyn Judson, E31 hull #55, Marina del Rey, CA