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.
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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.
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).
That depends on how wide the column is.
Assumptions:Density of water = 1000 kgm-3.Gravitational acceleration = 9.81 ms-2To calculate the pressure head of a 1 m depth of water, it is necessary to find the unit weight:Unit Weight = Density x gravityUnit Weight = 9810 Nm-3To calculate the pressure head at the base of the column of water:Pressure = Unit Weight x DepthPressure = 9810 x 1Pressure = 9810 PaThe resulting pressure is 9.81 kPa.
Volume of water = (pi) x (Radius of the well)2 x (depth of the water)