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_{sat}}{sp}</math>
: <math>h_u = \frac{\Delta w_{sat}}{sp}</math>
: <math>l_u = h_u + z - \Delta B</math>
: <math>l_u = h_u + B - \Delta d</math>


Where:
Where:
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* <math>\Delta w_{sat}</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>\Delta w_{sat}</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>z</math> = The [[terrain height (Water Overlay)|surface height]] in the cell, relative to {{datum}}.
* <math>B</math> = The [[terrain height (Water Overlay)|surface height]] in the cell, relative to {{datum}}.
* <math>\Delta B</math> = The [[Ground bottom distance m model attribute (Water Overlay)|GROUND_BOTTOM_DISTANCE_M]] (effectively available height in the underground model).
* <math>\Delta d</math> = The [[Ground bottom distance m model attribute (Water Overlay)|GROUND_BOTTOM_DISTANCE_M]] (effectively available height in the underground model).
* <math>sp</math> = The [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] of the underground terrain type, used here as a fraction.
* <math>sp</math> = The [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] of the underground terrain type, used here as a fraction.



Revision as of 14:42, 10 July 2020

Groundwater level is calculated per cell.

Where:

  • = The groundwater level, relative to datum. Also known as the watertable.
  • = 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 surface height in the cell, relative to datum.
  • = The GROUND_BOTTOM_DISTANCE_M (effectively available height in the underground model).
  • = The WATER_STORAGE_PERCENTAGE of the underground terrain type, used here as a fraction.

Related

The following topics are related to this formula.

Features
Groundwater
Formulas
Underground flow formula
Underground evaporation formula
Surface infiltration formula
Underground infiltration formula
Models
Surface model
Evaporation model
Infiltration model

Related models

Template:WaterOverlay nav