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Every 2.3077 feet of water in a column increases the water pressure at the bottom of the column by 1 pound per square inch.

A 39 foot column of water with a pressure of 120 psi at the base will have a pressure exerted on its top surface of 103.1 psi.

39 ft/ 2.3077 ft/1 psi = 16.9 psi ; 120 psi -16.9 psi = 103.1 psi

every meter of water in a column increases the pressure at the base of the column by 0.1 kg./ sq. cm (or 1 kilopascal)

A 12 meter column of water exerts a pressure at its base of 12 kPa. (or 1.2 kg/sq. cm)

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Q: How do you calculate water pressure at top if water pressure given at bottom?
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