Groundwater level formula (Water Overlay): Difference between revisions

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Groundwater level is calculated per cell.
Groundwater level is calculated per cell.
: <math>h_u = \frac{\Delta w_s}{sp}</math>
: <math>h_s = \frac{V_s}{f_{ws}}</math>
: <math>gl_u = h_u + B - d_b</math>
: <math>w_g = h_s + B_c - d_{b,c}</math>


Where:
Where:
* <math>h_u</math> = The height (column) of the saturated zone.
: <math>h_s</math> = The height (column) of the saturated zone.
* <math>\Delta w_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>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>sp</math> = The [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] of the underground terrain type, used here as a fraction.
: <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>gl_u</math> = The groundwater level, relative to {{datum}}. Also known as the watertable.
: <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.  


* <math>B</math> = The [[terrain height (Water Overlay)|surface height]] in the cell, relative to {{datum}}.
* <math>d_b</math> = The [[Ground bottom distance m model attribute (Water Overlay)|GROUND_BOTTOM_DISTANCE_M]] (effectively available height in the underground model).


{{article end
{{article end
|related=
|related=
==Related==
The following topics are related to this formula.
The following topics are related to this formula.
; Features
; Features
: [[Groundwater GeoTiff (Water Overlay)|Groundwater]]
: [[Groundwater Prequel (Water Overlay)]]
; Formulas
; Formulas
: [[Underground flow formula (Water Overlay)|Underground flow formula]]
: [[Ground flow formula (Water Overlay)]]
: [[Underground evaporation formula (Water Overlay)|Underground evaporation formula]]
: [[Ground evaporation formula (Water Overlay)]]
: [[Surface infiltration formula (Water Overlay)|Surface infiltration formula]]
: [[Surface infiltration formula (Water Overlay)]]
: [[Underground infiltration formula (Water Overlay)|Underground infiltration formula]]
: [[Ground infiltration formula (Water Overlay)]]
: [[Ground bottom flow formula (Water Overlay)]]
; Models
; Models
: [[Surface model (Water Overlay)|Surface model]]
: [[Surface model (Water Overlay)]]
* [[Underground model (Water Overlay)|Underground model]]
: [[Ground model (Water Overlay)]]
: [[Evaporation model (Water Overlay)|Evaporation model]]
: [[Evaporation model (Water Overlay)]]
: [[Infiltration model (Water Overlay)|Infiltration model]]
: [[Infiltration model (Water Overlay)]]
}}
}}


{{WaterOverlay formula nav}}
{{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.