what is the pressure dut to 30 m heght water column

Answer 1

Pressure at the bottom of a water column of height h = d*g*h

where, d=density of water(1000Kg/m^3)
g=9.8 m/s^2 & h=30 m

Calculate P yourself.

Answer 2

Atmospheric pressure should be added to Ajayb's answer.