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If you are looking for psi at 100', then the constant for water pressure (PSI) is 0.433 lbs per foot. So if the water is fresh drinking water, and the column is vertical and equal to or more than 1 square inch area, the answer is 43.3 psi. Doesn't matter if the pipe is 1 1/4"d or 3'. A 1" diameter pipe is only .78539... square inches. 43.3 x .78539... = 34.00774..lbs.