The height of a column of fluid generates a pressure at its base.

Fluid height (in meters) x density fluid (kg/m3) x gravity (9.81) = hydrostatic (in pascals)

1 meter column of water density 1000Kg/m3 = 9810 pascals (Newtons / m)

This pressure is called hydrostatic height when pumping the water column.

The pressure losses are often expressed in meters of column of fluid:

Window hydrostatic in MECAFLUX