Depends on the height. You gain approximately 0.4 psi for every foot of elevation; so at 10 foot elevation you will have ~4 psi.
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i think it is 1/2 x area of the body x depth of water
but i think the absolute pressure is P(pressure)/{p(density)*g(gravity)}
20 cm of water is about 1.96 kPa.
.4 psi
The diameter of the water column does not affect the pressure.It is the height of the column that determines the pressure at the base.(and also the barometric pressure and temperature).