Infiltration parameters for soils can be edited on either the Soil Grid Window of the Subcatchments Grid or the Soil Property Sheet.
This table describes all the data fields used to define the infiltration parameters for soils.
Fields that are common to the majority of objects can be found in the Common Fields topic.
Soil Data
Database Table Name: sw_soil
|
Field Name |
Description |
Database Field |
Size |
Precision |
Default |
Error Lower Limit |
Error Upper Limit |
Warning Lower Limit |
Warning Upper Limit |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Soil ID |
The unique name used to identify this soil. |
id |
Text |
254 |
|
0 |
|
|
|
|
|
| Initial infiltration |
Used by the Horton Infiltration model. Initial infiltration (
|
initial_infiltration | Double | I | 3 | 76.2 | 0 | ||||
| Limiting infiltration |
Used by the Horton Infiltration model. Limiting infiltration (
|
limiting_infiltration | Double | I | 3 | 12.7 | 0 | ||||
| Decay factor |
Used by the Horton Infiltration model. The infiltration rate decay constant for the Horton curve (1/hours). Typical values range between 2 and 7. |
decay_factor | Double | HR | 3 | 4 | |||||
| Maximum infiltration volume |
Used by the Horton Infiltration model. Maximum infiltration volume possible. |
max_infiltration_volume | Double | RD | 3 | 0 | 0 | ||||
| Average capillary suction |
Used by the Green Ampt model. The average value of soil capillary suction. |
average_capillary_suction | Double | RD | 1 | 76.2 | 0 | ||||
| Saturated hydraulic conductivity |
Used by the Green Ampt model. Soil saturated hydraulic conductivity. |
saturated_hydraulic_conductivity | Double | R | 1 | 76.2 | 0 |
|
|
|
|
| Initial moisture deficit |
Used by the Green Ampt model. The fractional difference between soil porosity and actual moisture content. |
initial_moisture_deficit | Double | 2 | 0 | 1 | |||||
| Curve number |
Used by the Curve Number model. The SCS number of the curve associated with this subcatchment. A list of curve number values that can be used can found here. |
curve_number | Double | 2 | 3 | 0 | 100 | ||||
| Drying time |
Used in the Horton Infiltration and Curve Number models. Time in days for a fully saturated soil to dry completely. Typical values range from 2 to 14 days. |
drying_time | Double | TD | 3 | 7 |
) from the equation to calculate rate:
) from the equation to calculate rate: