If we have six (6) feet of water, that will convert to about 2.6 psi (pounds per square inch).
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The pressure at 400 feet below sea level would be approximately 173.5 psi (pounds per square inch). This is because for every 33 feet of depth in seawater, the pressure increases by 1 atm or 14.7 psi.
One pound per square inch (psi) is equal to approximately 2.31 feet of water. This means that a column of water that is 2.31 feet tall exerts a pressure of 1 psi at its base.
The ratio of feet in the air to pounds per square inch of water pressure at the use point in a gravity water system is approximately 2.31 feet of elevation for every 1 psi of pressure. This ratio is based on the general relationship between water height (feet) and pressure (psi) due to gravity.
To calculate the PSI of water in a river based on the velocity of the river, you can use the formula PSI = 0.433 * (velocity in feet per second)^2. This formula accounts for the pressure increase due to the velocity of the flowing water. Just plug in the velocity of the river in feet per second into the formula to calculate the PSI.
Every one feet the pressure raises by 24.9 psi.