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So that you will have water pressure from gravity.
to store water where the there is a need for it ie a site of low water pressure so when there is high demand the pressure can be kept
It's a pressurized system. When it exceeds cap release pressure, it comes out.
Rushing water is usually controlled by pressure and topography of the land.
A pressure valve is usually installed on water systems to prevent excess water pressure from destroying fixtures or other plumbing components. When the pressure exceeds the valve ratings the valve opens and releases water/pressure from the line.
It's usually just called a "pressure gauge", the assumption being that you know, or a label on it tells you, that it is measuring water-pressure.
Usually about 100 psi.
For the pumps
Optimal household water pressure should be between 40 psi - 80 psi. If water is supplied by public water usually they supply the minimum pressure. If you have more than 80 psi, a pressure reducer is recommended.
To withstand high water pressure when they are submerged at sea.
There is usually a main water valve that comes into the house, locate this valve and turn it down. Installing a pressure reducing valve after water main valve will allow for adjustment of water pressure to proper setting.
GE claims their GE Profile Built-In Dishwashers uses 8.4 gallons per load for a normal load