Learn here about everything you need for a rain barrel water pressure calculation. Designing a gravity rain barrel pressure pump doesn't have to be difficult to be functional.

"Normal" water pressure varies, but anything in the range of 40 to 60 psi is adequate. If your water pressure measures below 40 psi, you were correct to assume your water pressure is too low.

To use the water pressure at the seabed in practice, the mechanical energy is converted by a reversible pump turbine, as in a normal pumped storage hydroelectric plant.