Interesting facts regarding pumping water (or not)
The hydrostatic pressure of fresh water is 0.433 psi/foot (1 psi drop for every 2.31 feet of head) With salt water, the hydrostatic pressure is about 5% more.
A long hose will also cause some pressure drop when flowing, especially if its a small diameter hose and a high flow rate. With the water shut off and the end of the hose, there is no pressure drop other than the effect of hydrostatic pressure.
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