Hydrostatic Pressure HELP!

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For the hydrostatic pressure, when do we use [ p = ρ.g.h ] and [ p = ρ.g.hcg ]

where:
ρ = density
g = acc of gravity
h = height of water column
hcg = the distance to the center of gravity from the surface of water downward
 
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SteamKing
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It depends. h should actually be measured from the surface to the 'center of pressure', which is not always located at the c.g. of a submerged body.

http://www.nptel.iitm.ac.in/courses/Webcourse-contents/IIT-KANPUR/FLUID-MECHANICS/lecture-5/5-2_hydro_thrust_plane_surf.htm [Broken]
 
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