Groundwater level formula (Water Overlay): Difference between revisions

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Groundwater level is calculated per cell.
Groundwater level is calculated per cell.
: ''WH<sub>underground</sub> = W<sub>sat</sub> / WSP''
: <math>h_s = \frac{V_s}{f_{ws}}</math>
: ''WL<sub>underground</sub> = WH<sub>underground</sub> + H<sub>surface</sub> - GBDM''
: <math>w_g = h_s + B_c - d_{b,c}</math>


Where:
Where:
* WL<sub>underground</sub> = The groundwater level, relative to [[Datum|datum]]. Also known as the watertable.
: <math>h_s</math> = The height (column) of the saturated zone.
* WH<sub>underground</sub> = The height (column) of the saturated zone.
: <math>V_s</math> = 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.
: <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>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.  


* W<sub>sat</sub> = 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.
* H<sub>surface</sub> = The [[terrain height (Water Overlay)|surface height]] in the cell, relative to datum.
* GBDM = The [[Ground bottom distance m model attribute (Water Overlay)|GROUND_BOTTOM_DISTANCE_M]] (effectively available height in the underground model).
* WSP = The [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] of the underground terrain type.


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{{article end
{{Water Module buttons}}
|related=
The following topics are related to this formula.
; Features
: [[Groundwater Prequel (Water Overlay)]]
; Formulas
: [[Ground flow formula (Water Overlay)]]
: [[Ground evaporation 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)]]
: [[Evaporation model (Water Overlay)]]
: [[Infiltration model (Water Overlay)]]
}}
 
{{WaterOverlay formula nav}}

Latest revision as of 15:18, 26 January 2024

Groundwater level is calculated per cell.

Where:

= The height (column) of the saturated zone.
= 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.
= The WATER_STORAGE_PERCENTAGE of the ground terrain type, used here as a fraction.
= The groundwater level, relative to datum. Also known as the watertable.
= the datum height of the surface of cell c, set by the elevation or a Terrain elevation prequel.
= 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.