Groundwater level formula (Water Overlay): Difference between revisions

Revision as of 10:50, 2 February 2023

Groundwater level is calculated per cell.

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

w_{g}=h_{s}+B-d_{b}

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.
$f_{s}$ = 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.
$B$ = The surface height in the cell, relative to datum.
$d_{b}$ = The GROUND_BOTTOM_DISTANCE_M (effectively available height in the underground model).

@@ Line 1: / Line 1: @@
 Groundwater level is calculated per cell.
-: <math>h_u = \frac{\Delta w_s}{sp}</math>
+: <math>h_s = \frac{V_s}{f_s}</math>
-: <math>gl_u = h_u + B - d_b</math>
+: <math>w_g = h_s + B - d_b</math>
 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_s</math> = The [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] of the underground 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 watertable.
 * <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).