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Inches of water x 0.03613 equals pounds per square inch (psi).
10" Water Column equals about .4 Pounds per Square Inch or 0.36127291827412783psi exactly.
That could depend on several different factors, such as altitude etc... I do believe that at about sea level its -14.7 psi.
Inches of mercury x 0.4912 = psi
If it is fresh water, and the surface is at sea level, then the pressure at the surface is 14.69 psi. As you submerge, then the pressure from the weight of the water above you is added to the air pressure above the water. For each foot that you descend, the water pressure will increase by 0.4331 psi, so at 328 feet deep, the water pressure is 142.0568 psi. Add the 14.69 psi air pressure to get 156.7468 psi.