Groundwater level formula (Water Overlay): Difference between revisions

Revision as of 14:44, 10 July 2020

Groundwater level is calculated per cell.

h_{u}={\frac {\Delta w_{s}}{sp}}

l_{u}=h_{u}+B-d_{b}

Where:

$h_{u}$ = The height (column) of the saturated zone.
$\Delta w_{s}$ = 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.
$sp$ = The WATER_STORAGE_PERCENTAGE of the underground terrain type, used here as a fraction.
$l_{u}$ = 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).

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@@ Line 1: / Line 1: @@
 Groundwater level is calculated per cell.
-: <math>h_u = \frac{\Delta w_{sat}}{sp}</math>
+: <math>h_u = \frac{\Delta w_s}{sp}</math>
 : <math>l_u = h_u + B - d_b</math>
 Where:
+* <math>h_u</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>sp</math> = The [[Terrain water storage percentage (Water Overlay)|WATER_STORAGE_PERCENTAGE]] of the underground terrain type, used here as a fraction.
 * <math>l_u</math> = The groundwater level, relative to {{datum}}. Also known as the watertable.
-* <math>h_u</math> = The height (column) of the saturated zone.
-* <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>d_b</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==