Groundwater level formula (Water Overlay)

Groundwater level is calculated per cell.

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

w_{g}=h_{s}+B_{c}-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_{c}

= the datum height of the surface of cell c, set by the elevation or a Terrain elevation prequel.

d_{b}

= The GROUND_BOTTOM_DISTANCE_M (effectively available height in the underground model).

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