Surface infiltration formula (Water Overlay): Difference between revisions

Revision as of 07:42, 17 October 2019

Surface infiltration is calculated per cell.

First, the infiltration capacities are calculated:

C_water = W_surface

C_top = max( I_con, I_surf )

I_surf = 0 if a construction is present

I_con = 0 if no construction is present

Then the actual infiltration:

Δw = min( C_water , Δt * C_top)

Where:

$C_{water}$ = The amount of infiltration that can take place based on the amount of water on the surface.
$C_{top}$ = The amount of infiltration that can take place based on the infiltration values present.

W_surface = The amount of water (the water column) on the surface.
I_con = The GROUND_INFILTRATION_MD of a construction on a specific cell (if present).
I_surf = The GROUND_INFILTRATION_MD of the surface terrain type. This value should be interpreted as the vertical conductivity (Kv) of the sub-soil.

@@ Line 11: / Line 11: @@
 Where:
-* Δw = The surface infiltration which takes place.
+* <math>\delta w</math> = The surface infiltration which takes place.
 * <math>\Delta t</math> = Computational timestep.
-* C<sub>water</sub> = The amount of infiltration that can take place based on the amount of water on the surface.
+* <math>C_{water}</math> = The amount of infiltration that can take place based on the amount of water on the surface.
-* C<sub>top</sub> = The amount of infiltration that can take place based on the infiltration values present.
+* <math>C_{top}</math> = The amount of infiltration that can take place based on the infiltration values present.
 * W<sub>surface</sub> = The amount of water (the water column) on the surface.