Groundwater level formula (Water Overlay): Difference between revisions

Latest revision as of 11:33, 5 May 2026

Groundwater level is calculated per cell.

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

w_{g} = h_{s} + B_{c} - d_{b, c}

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_{w s}

= The WATER_STORAGE_PERCENTAGE of the ground 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, c}

= The ground bottom distance of the cell c, defined by a Bottom distance prequel or a general GROUND_BOTTOM_DISTANCE_M of the Water Overlay.

The following topics are related to this formula.

Features: Groundwater Prequel (Water Overlay)
Formulas: Ground flow formula (Water Overlay); Ground transpiration formula (Water Overlay); Surface infiltration formula (Water Overlay); Ground infiltration formula (Water Overlay); Ground bottom flow formula (Water Overlay)
Models: Surface model (Water Overlay); Ground model (Water Overlay); Evapotranspiration model (Water Overlay); Infiltration model (Water Overlay)

@@ Line 8: / Line 8: @@
 : <math>f_{ws}</math> = The [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] of the ground terrain type, used here as a fraction.
 : <math>w_g</math> = The groundwater level, relative to {{datum}}. Also known as the [[Ground watertable result type (Water Overlay)|watertable]].
-: <math>B_c</math> = the datum height of the surface of cell c, set by the [[Elevation (Water Overlay)|elevation]] or a [[Terrain elevation prequel (Water Overlay)|Terrain elevation prequel]].
+: <math>B_c</math> = the datum height of the surface of cell c, set by the [[Elevation model (Water Overlay)|elevation]] or a [[Terrain elevation prequel (Water Overlay)|Terrain elevation prequel]].
 : <math>d_{b,c}</math> = The ground bottom distance of the cell c, defined by a [[Bottom distance prequel (Water Overlay)|Bottom distance prequel]] or a general [[Ground_bottom_distance_m_(Water_Overlay)|GROUND_BOTTOM_DISTANCE_M]] of the Water Overlay.