So I did some real world tests and calculations on my pumps.
Four pumps will net me about 160GPH
A one inch hole lets in 2,400GPH
Nowhere near enough for even a relatively small hole. Basically all pumps are useful for is open windows and children's dribble?
I made a video, the math is at the end, can this be right?
That Sinking Feeling | Sailing With Kids