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The diameter of the water column does not affect the pressure.It is the height of the column that determines the pressure at the base.(and also the barometric pressure and temperature).
You cannot. The whole point in describing it as a water column is that it is a body of water that is 2 metres high - WHATEVER the size of its cross sectional area.
Water column head is expressed either as the height of the column ... 6 meters here ... or else as the pressure at the bottom ... 58.842 kPa here. 'Kg' can't be a unit of water column head, and the diameter of the column is irrelevant.
Surface area of a cylinder (the column) = pi*diameter*height and measured in square units.
Measure the circumference of the column. Divide the circumference by "Pi" (3.1417) and the answer is the diameter. Example: If the circumference is 15", the diameter is 4.78", or 4 25/32"