Groundwater level formula (Water Overlay)

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Groundwater level is calculated per cell.

WHunderground = Wsat / WSP
WLunderground = WHunderground + Hsurface - GBDM


  • WLunderground = The groundwater level, relative to datum. Also known as the watertable.
  • WHunderground = The height (column) of the saturated zone.
  • Wsat = 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.
  • Hsurface = The surface height in the cell, relative to datum.
  • GBDM = The GROUND_BOTTOM_DISTANCE_M (effectively available height in the underground model).
  • WSP = The WATER_STORAGE_PERCENTAGE of the underground terrain type.


The following topics are related to this formula.

Underground flow formula
Underground evaporation formula
Surface infiltration formula
Underground infiltration formula
Surface model
Evaporation model
Infiltration model

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