how much water pressure from a tank?

The water pressure from a tank depends on the height of the water column above the outlet. Generally, water pressure can be calculated using the formula: pressure (in psi) = height (in feet) × 0.434. For example, a tank with water 10 feet high would create approximately 4.34 psi of pressure at the outlet. Additionally, factors such as tank shape and outlet size can influence the actual pressure experienced.