scupper change from floor to transom

[csurf]

I am thinking of adding above the waterline scuppers to get rid of water should I ever have several inches in the boat.With the scuppers I have( 2001SeaCraft20) the boat must be moving forward to get the water out with any kind of speed. AM I better off w a pump on the floor? I don't think it is as straight forward on the 20 as it is with the 23.

So you want to add scuppers above the deck to drain faster when there is allot of water, sort of like an overflow. If you're not draining fast enough and you think it might me dangerous, enlarge your current scuppers to let more water through. The bigger the hole more water drains out.