Groundwater level formula (Water Overlay): Difference between revisions

Revision as of 13:10, 25 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 underground 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.

@@ Line 1: / Line 1: @@
 Groundwater level is calculated per cell.
-: <math>h_s = \frac{V_s}{f_s}</math>
+: <math>h_s = \frac{V_s}{f_{ws}}</math>
 : <math>w_g = h_s + B_c - d_{b,c}</math>
@@ Line 6: / Line 6: @@
 : <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>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_{ws}</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 [[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]].