Self Bailing - 20'

[JCB]

At rest at the dock, full of fuel, my scupper is about 6 inches underwater. Water is not coming in, but the water that remains in the drain tubes comes back onto the deck when I walk around the stern of the boat. That water won't drain until the boat starts moving. I am thinking the perko cockpit scuppers installed in the deck will hopefully stop the water that is remaining from coming back up to deck level.