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
Water Module
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Water Module
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Tutorials
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Overview
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Theory
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Benchmarks
Models
Surface • Ground • Rain • Evaporation • Infiltration • Elevation • Breach • Sewer • Storage • Tracer flow • Border • Order
Model formulas
Timestep • Season • Surface water level • Groundwater level
Flow formulas
Surface flow • Surface infiltration • Ground flow • Ground infiltration • Surface evaporation • Ground evaporation • Ground bottom flow
Hydraulic structure formulas
Culvert • Weir • Breach growth • Breach flow • Pump • Sewer Overflow • Inlet • Drainage
Related
Building attributes • Hydrological features • Hydraulic structures •  Terrain attributes • Model attributes • Results • Simulation data
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