Groundwater level formula (Water Overlay)

Groundwater level is calculated per cell.

h_{s}={\frac {V_{s}}{f_{s}}}

w_{g}=h_{s}+B-d_{b}

Where:

$h_{s}$ = The height (column) of the saturated zone.
$V_{s}$ = 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.
$f_{s}$ = The WATER_STORAGE_PERCENTAGE of the underground terrain type, used here as a fraction.
$w_{g}$ = The groundwater level, relative to datum. Also known as the watertable.
$B$ = The surface height in the cell, relative to datum.
$d_{b}$ = The GROUND_BOTTOM_DISTANCE_M (effectively available height in the underground model).

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