Group: Forum Members
Yes, there can be good reasons to not do this, most related to restricting the flow of water and the increased likelihood of check valves to get clogged with the usual debris that often accumulates on our decks and needs to find its way out. Good water flow out of the cockpit is important, not for the water that occasionally gets pushed up the scupper hoses, but more for the rarer, but more dangerous, occasion of getting pooped and having a full cockpit of heavy water making more likely another pooping with the danger of down-flooding.
We also suffered with wet cockpit floors (up through the scuppers as you described) when there were big following seas or when greatly heeled over and rolled with a big one. For us it was mostly annoying as we would then get salty water tracked everywhere. We “solved” this by using something akin to Dry Decks which allows the odd water to be on the deck and find its way out but we step only on the Dry Deck: so our boots are dry. The decking also traps debris before it gets to the scupper so, overall, water runs out more quickly because scuppers get clogged less often.
As you describe it, I am not sure how the water getting to the cockpit floor through the scuppers could get into a cockpit locker and sit around the liferaft. In any case, water should not be able to get into cockpit lockers as they are almost always open to the interior to the boat, so, if that is the case, I would remedy that.
If you continue to want to install check valves, a quick and easy test would be to buy one, fit it to a hose and time the difference between vacating a jerry can full of water with and without the valve. Extrapolate that to the cockpit volume. I would be interested in the results. Also, inspect the valve to estimate how vulnerable to clogging with deck detritus.
I hope these thoughts help.
My best, Dick Stevenson, s/v Alchemy, Galway, Ireland