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.


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)
Water Module
Benchmarks button.png
Introduction button.png
Water Module
Benchmarks button.png
Getting started button.png
Tutorials
Benchmarks button.png
Overview button.png
Overview
Benchmarks button.png
Theory button.png
Theory
Benchmarks button.png
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Benchmarks
Models
Surface • Ground • Rain • Evaporation • Infiltration • Elevation • Breach • Sewer • Storage • Tracer flow • Border • Order
Model formulas
Timestep • Season • Surface water level • Groundwater level
Flow formulas
Surface flow • Surface infiltration • Ground flow • Ground infiltration • Surface evaporation • Ground evaporation • Ground bottom flow
Hydraulic structure formulas
Culvert • Weir • Breach growth • Breach flow • Pump • Sewer Overflow • Inlet • Drainage
Related
Building attributes • Hydrological features • Hydraulic structures •  Terrain attributes • Model attributes • Results • Simulation data
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