I'm helping fix up this boat. One issue it has is, the self draining cockpit drain plugging up. There are 2 drain holes just aft of the companion door. On the inside the port tube crosses at nearly a 90° angle over and joins the starboard drain tube. The tube continues at a shallow angle where it exit's through the starboard thru hull fitting. I haven't had time to thoroughly examine the design and yet it seams problem one is the drain and tube are too small a diameter. Problem 2 is the corner angles are too steep and the runoff angles are too shallow. This causes the water to bottleneck and any debris to get trapped. Does anyone have any suggestions on the best way to fix this? I thought about draining into a stand alone bilge and using an auto bilge pump. The problem I see with that is if the pump fails or the battery dies the bilge will overflow. Any ideas? Thanks in advance.