Groundwater level formula (Water Overlay)

Groundwater level is calculated per cell.

$h_{u}={\frac {\Delta w_{s}}{sp}}$

$gl_{u}=h_{u}+B-d_{b}$

Where:

• $h_{u}$ = The height (column) of the saturated zone.
• $\Delta w_{s}$ = 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.
• $sp$ = The WATER_STORAGE_PERCENTAGE of the underground terrain type, used here as a fraction.
• $gl_{u}$ = 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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Underground flow formula

Underground evaporation formula

Surface infiltration formula

Underground infiltration formula

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