The Infiltration Editor allows you to specify the infiltration characteristics for the three supported infiltration formulae.
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Option
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Description |
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Max Infiltration Rate |
Maximum infiltration rate on the Horton curve (mm/hr or in/hr). |
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Min Infiltration Rate |
Minimum infiltration rate on the Horton curve (mm/hr or in/hr). Equivalent to the saturated hydraulic conductivity. See the Soil Characteristics Table for typical values. |
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Decay Constant |
Infiltration rate decay constant for the Horton curve (1/hours). Typical values range between 2 and 7. |
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Drying Time |
Time in days for a fully saturated soil to dry completely. Typical values range from 2 to 14 days. |
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Max Infiltration Volume |
Maximum infiltration volume possible (mm or inches, 0 if not applicable). Can be estimated as the difference between a soil's porosity and its wilting point times the depth of the infiltration zone. |
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Option
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Description |
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Suction Head |
Average value of soil capillary suction along the wetting front (mm or inches). |
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Conductivity |
Soil saturated hydraulic conductivity (mm/hr or in/hr). |
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Initial Deficit |
Difference between soil porosity and initial moisture content (a fraction). The initial deficit for a completely drained soil is the difference between the soil's porosity and its field capacity. |
Typical values for all of these parameters can be found in the Soil Characteristics Table.
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Option
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Description |
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Curve Number |
This is the SCS curve number, which is tabulated in the publication SCS Urban Hydrology for Small Watersheds, 2nd Ed., (TR-55), June 1986. Consult the SCS Runoff Curve Numbers Table for a listing of values by soil group, and the accompanying Soil Group Table for the definitions of the various groups. |
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Conductivity |
The soil's saturated hydraulic conductivity in mm/hr or inches/hr. |
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Drying Time |
The number of days it takes a fully saturated soil to dry. Typical values range between 2 and 14 days. |