A 1 meter tall vertical column of water exerts 9.8 kpa of static pressure. At the hose's nozzle outlet, you would need to apply 127kpa, or 13 times 9.8kpa, in order to move water 13 meters up a vertical axis.
A 1 meter tall vertical column of water exerts a static pressure of 9.8 kpa. You would need to put 127kpa - or 13 times 9.8kpa - at the hose's nozzle exit to move water 13 meters up a vertical axis.
The final sentence is crucial since it clarifies that this pressure is not what the pump or the mains require.
The length of the hose, friction inside the hose, any valves, or restriction nozzles all greatly limit the pressure between the supply/pump and the nozzle, which in turn affects the pressure required at the mains or the pump.
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