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Inches of mercury x 0.4912 = 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.
You need to know how high the water column is to calculate the pressure it exerts at its base! For example, a column of water 1 metre deep would exert a pressure of 9.81 kPa at its base (density x gravity x depth - 1000 * 9.81 * 1). This would be equal to approx 1.42 PSI.
Well that depends, first off pressure is equal to specific gravity times height. P=SG*h. so the pressure due to the water column would be 0.0361 psi given that SG of water = 62.4 lb/ft^3. Then you have to take into consideration any other pressures acting on the water. If the top of the column is open to the air then the absolute pressure would be 14.7321 psi given that atmospheric pressure is 14.696. The basic formula to make this calculation in any situation is P=P0+SG*h where P0 is the pressure above the column.