Groundwater level formula (Water Overlay): Difference between revisions

Latest revision as of 15:18, 26 January 2024

Groundwater level is calculated per cell.

h_{s}={\frac {V_{s}}{f_{ws}}}

w_{g}=h_{s}+B_{c}-d_{b,c}

Where:

h_{s}

= The height (column) of the saturated zone.

V_{s}

= 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.

f_{ws}

= The WATER_STORAGE_PERCENTAGE of the ground terrain type, used here as a fraction.

w_{g}

= The groundwater level, relative to datum. Also known as the watertable.

B_{c}

= the datum height of the surface of cell c, set by the elevation or a Terrain elevation prequel.

d_{b,c}

= 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.

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)

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

@@ Line 1: / Line 1: @@
 Groundwater level is calculated per cell.
-: <math>h_u = \frac{\Delta w_{sat}}{sp}</math>
+: <math>h_s = \frac{V_s}{f_{ws}}</math>
-: <math>l_u = h_u + B - \Delta d</math>
+: <math>w_g = h_s + B_c - d_{b,c}</math>
 Where:
-* <math>l_u</math> = The groundwater level, relative to {{datum}}. Also known as the watertable.
+: <math>h_s</math> = The height (column) of the saturated zone.
-* <math>h_u</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>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.
-* <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>B</math> = The [[terrain height (Water Overlay)|surface height]] in the cell, relative to {{datum}}.
-* <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.
-==Related==
+{{article end
+|related=
 The following topics are related to this formula.
 ; Features
-: [[Groundwater GeoTiff (Water Overlay)|Groundwater]]
+: [[Groundwater Prequel (Water Overlay)]]
 ; 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
-: [[Surface model (Water Overlay)|Surface model]]
+: [[Surface model (Water Overlay)]]
-: [[Evaporation model (Water Overlay)|Evaporation model]]
+: [[Ground model (Water Overlay)]]
-: [[Infiltration model (Water Overlay)|Infiltration model]]
+: [[Evaporation model (Water Overlay)]]
+: [[Infiltration model (Water Overlay)]]
+}}
-==Related models==
+{{WaterOverlay formula nav}}
-* [[Underground model (Water Overlay)|Underground model]]
-{{Template:WaterOverlay_nav}}
-{{Water Module buttons}}

Groundwater level formula (Water Overlay): Difference between revisions

Latest revision as of 15:18, 26 January 2024

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