Groundwater level formula (Water Overlay)

Groundwater level is calculated per cell.

$h_u=\frac{\mathrm{\Delta }{w}_s}{sp}$

$g{l}_u=h_u+B-d_b$

Where:

• $h_u$ = The height (column) of the saturated zone.
• $\mathrm{\Delta }{w}_s$ = 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.
• $g{l}_u$ = 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).

Related

The following topics are related to this formula.

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Groundwater

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Underground flow formula

Underground evaporation formula

Surface infiltration formula

Underground infiltration formula

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