wrote
If it's not to much of a problem, could you tell me how much weight
would it take to increase draft 14" on a 12'X20' section of hull,
assuming it's a rectangle hull section.

Just leave out the .7 which is a factor for the taper of the waterline. 14 x
12 x 20 x 5.33 = (where did I put my calculator?)

Salt water, right?

Thanks
Joe