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If we consider a tank of height h , filled with water then the pressure at the bottom surface of tank will be (look at the figure also)-

As the pressure at the surface of water is atmospheric, so

Pressure at a depth h below the surface of water = atmospheric pressure + pressure due to water column of height h.

Given that height of tank is h= 10m

The atmospheric pressure = 100 kPa

Density of water =1g/cm³ = 10³ kg m^–3

The gravitational constant g = 10 m s^–2

Then the pressure at a depth h will be = atmospheric pressure + pressure at bottom

= 100kpa +

= 10⁵ N/m² +10³k/m³10m/s²10m

= 200kpa