Infiltration Surface (2D) Data Fields

Infiltration Surface (2D) data can be edited on either the Infiltration Surface (2D) Grid Window of the Polygons Grid or the Infiltration Surface (2D) Property Sheet.

Most data can be edited on the grid, but some fields cannot be displayed in the grid format.

To view and edit all zone data, use the Property Sheet.

The following describes all the data which can be used to define a Infiltration Surface (2D).

Common Data Fields

Fields that are common to the majority of objects can be found in the Common Fields topic.

Infiltration Surface (2D) Data

Database Table Name: hw_2d_infil_surface

Show Columns

Database Names

Size, Type and Units

Defaults and Error Limits

Field Name

Help Text

Database Field

Data Type

Size

Units

Precision

Default

Error Lower Limit

Error Upper Limit

Warning Lower Limit

Warning Upper Limit

ID

The name of the surface

surface_id

Text

64

 

0

 

 

 

 

 

Infiltration type

Choose an infiltration model from the drop-down menu.

Database value Description
Fixed Fixed
Horton Horton
ConstInf ConstInf
GreenAmpt Green-Ampt
runoff_volume_type Text 10   0          
Fixed runoff coefficient

This is a proportion. For example, 0.1 indicates 10% runoff from this surface.

Enabled when Infiltration type is set to Fixed or ConstInf.

runoff_coefficient Double     5   0 1    

Horton initial

Initial infiltration rate (f0) when soil water content is zero.

Used when Infiltration Type is set to Horton.

initial_infiltration Double   I 3   0.001      
Horton limiting

Limiting infiltration rate when soil is saturated and drainage capacity equals the infiltration rate.

Used when Infiltration Type is set to Horton.

limiting_infiltration Double   I 3   0.001      
Horton decay

Rate of decay of potential infiltration rate.

Used when Infiltration Type is set to Horton.

decay_factor Double   HR 3   0.001      
Horton recovery

Rate of recovery of potential infiltration rate.

If this value is blank, the recovery factor is set to the same value as the Horton decay factor.

Used when Infiltration Type is set to Horton.

recovery_factor Double   HR 3   0.001      
Infiltration loss coefficient

Used to calculate the infiltration loss when Infiltration Type is set to ConstInf.

infiltration_coeff Double   I 1 0 0      
Green-Ampt suction

The average capillary suction at the wetting front.

Used when Infiltration Type is set to Green-Ampt.

average_capillary_suction Double   RD     0      
Green-Ampt conductivity

The minimum or asymptotic infiltration rate of the soil. This is equivalent to limiting infiltration rate in Horton.

Used when Infiltration Type is set to Green-Ampt.

saturated_hydraulic_conductivity Double   R     0      
Green-Ampt deficit

The maximum soil moisture deficit (the fractional difference between soil porosity and actual moisture content).

Used when Infiltration Type is set to Green-Ampt.

initial_moisture_deficit Double         0.01 1    

2D Infiltration Surfaces

2D Infiltration Model

Polygons

Polygons Grid

Property Sheets