Groundwater level formula (Water Overlay)

Groundwater level is calculated per cell.

h_{u}={\frac {\Delta w_{sat}}{sp}}

l_{u}=h_{u}+B-\Delta d

Where:

$l_{u}$ = The groundwater level, relative to datum. Also known as the watertable.
$h_{u}$ = The height (column) of the saturated zone.

$\Delta w_{sat}$ = The amount of water in the saturated zone. The height of the water column if the equivalent amount of water was placed on the surface.
$B$ = The surface height in the cell, relative to datum.
$\Delta d$ = The GROUND_BOTTOM_DISTANCE_M (effectively available height in the underground model).
$sp$ = The WATER_STORAGE_PERCENTAGE of the underground terrain type, used here as a fraction.

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