Groundwater level formula (Water Overlay): Difference between revisions

Revision as of 14:42, 10 July 2020

Groundwater level is calculated per cell.

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

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

Where:

$l_{u}$ = The groundwater level, relative to datum. Also known as the watertable.
$h_{u}$ = The height (column) of the saturated zone.

$\Delta w_{sat}$ = 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.
$B$ = The surface height in the cell, relative to datum.
$d_{b}$ = The GROUND_BOTTOM_DISTANCE_M (effectively available height in the underground model).
$sp$ = The WATER_STORAGE_PERCENTAGE of the underground terrain type, used here as a fraction.

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@@ Line 1: / Line 1: @@
 Groundwater level is calculated per cell.
 : <math>h_u = \frac{\Delta w_{sat}}{sp}</math>
-: <math>l_u = h_u + B - \Delta d</math>
+: <math>l_u = h_u + B - d_b</math>
 Where:
@@ Line 9: / Line 9: @@
 * <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>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.