Surface infiltration formula (Water Overlay)

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: $\Delta w=min(C_{water},\Delta t\cdot C_{top})$

Where:

• $\Delta w$ = The surface infiltration which takes place.
• $\Delta t$ = Computational timestep.

• $C_{water}$ = 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.

Related

The following topics are related to this formula.

Formulas

Surface water level formula

Groundwater level formula

Underground infiltration formula

Models

Surface model

Underground model

Infiltration model

Substance flow model