Surface infiltration formula (Water Overlay): Difference between revisions

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Then the actual infiltration:
Then the actual infiltration:


<math>\Delta w_t = min( h, \bar{I}_{surface} \cdot \Delta t \cdot f_{i,t})</math>  
<math>\Delta w_t = min( h_t, \bar{I}_{surface} \cdot \Delta t \cdot f_{i,t})</math>  


Where:
Where:
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: <math>\Delta w_t</math> = The surface infiltration which takes place at time <math>t</math>.
: <math>\Delta w_t</math> = The surface infiltration which takes place at time <math>t</math>.
: <math>h</math> = The amount of water on the surface. Also known as the water column.
: <math>h_t</math> = The amount of water on the surface at time <math>t</math>. Also known as the water column.
: <math>\Delta t</math> = Computational timestep.
: <math>\Delta t</math> = Computational timestep.
: <math>f_{i,t}</math> = The interpolated infiltration factor at time <math>t</math>. Configured using [[Infiltration_factor_s_(Water_Overlay)|INFILTRATION_FACTOR_S]].
: <math>f_{i,t}</math> = The interpolated infiltration factor at time <math>t</math>. Configured using [[Infiltration_factor_s_(Water_Overlay)|INFILTRATION_FACTOR_S]].

Revision as of 09:33, 13 December 2022

Surface infiltration is calculated per cell. First, the infiltration capacities are calculated:

Then the actual infiltration:

Where:

= The average infiltration capacity based on constructions on top of the surface, based on GROUND_INFILTRATION_MD defined in either the building or function.
= The average infiltration capacity based on the surface terrain, defined by GROUND_INFILTRATION_MD. This value should be interpreted as the vertical conductivity (Kv) of the sub-soil.
= The average infiltration capacity on top of the surface.
= The average infiltration capacity below the surface.
= The infiltration capacity from surface to the unsaturated zone.
= The surface infiltration which takes place at time .
= The amount of water on the surface at time . Also known as the water column.
= Computational timestep.
= The interpolated infiltration factor at time . Configured using INFILTRATION_FACTOR_S.

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
Tracer flow model