Just had second big flood since taking ownership of C104. Boat is in very poor condition. I just sat in the boat in a thunderstorm working on some wiring and watched the cockpit reach the entrance door level. Is there a stop cock. No blockages are obvious and I even went under in a thick wet suit to see if there was any obvious blockage underneath. I couldn't find the exit hole(s). If there isn't a hidden stopcock, what is the best way to clear a blockage. Any help is appreciated. Cheers