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_s = \frac{V_s}{f_s}</math>
: <math>h_s = \frac{V_s}{f_s}</math>
: <math>w_g = h_s + B - d_b</math>
: <math>w_g = h_s + B_c - d_b</math>


Where:
Where:
* <math>h_s</math> = The height (column) of the saturated zone.
: <math>h_s</math> = 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>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_s</math> = The [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] of the underground terrain type, used here as a fraction.
: <math>f_s</math> = The [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] of the underground terrain type, used here as a fraction.
* <math>w_g</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 watertable.
* <math>B</math> = The [[terrain height (Water Overlay)|surface height]] in the cell, relative to {{datum}}.
: <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</math> = The [[Ground bottom distance m model attribute (Water Overlay)|GROUND_BOTTOM_DISTANCE_M]] (effectively available height in the underground model).
: <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

Revision as of 12:58, 25 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 underground 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_M (effectively available height in the underground model).

Related

The following topics are related to this formula.

Features
Groundwater
Formulas
Underground flow formula
Underground evaporation formula
Surface infiltration formula
Underground infiltration formula
Underground seepage formula
Models
Surface model
Underground model
Evaporation model
Infiltration model
Water Module
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Water Module
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Tutorials
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Overview
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Theory
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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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