Catchment - ILSAX Hydrological Model
Catchment-ILSAX Hydrological Model Attributes
| Attribute | Description |
|---|---|
| Soil Type | Specify how to define pervious cover/loss data when using the ILSAX runoff method. Two methods are available - Pre-defined, and User Defined. If you choose Pre-defined, then you can specify the ILSAX Soil Value, as a number between 1 and 4. If you choose User Defined, then you can specify seven properties, to define the soil. |
| ILSAX Soil Value | The soil coefficient for normal conditions. This is available when "Soil Type" is Pre-defined. An integer value of 1, 2, 3, or 4 corresponds to hydrologic soil groups A, B, C, or D in TR-55 " Urban Hydrology for Small Watersheds". A non-integer value - e.g. 2.5, interpolates between two soil groups. |
| AMC 1 Depth | The 1st rainfall depth for pervious ILSAX cover. |
| AMC 2 Depth | The 2nd rainfall depth for pervious ILSAX cover. |
| AMC 3 Depth | The 3rd rainfall depth for pervious ILSAX cover. |
| AMC 4 Depth | The 4th rainfall depth for pervious ILSAX cover. |
| fo (ILSAX) | The initial or maximum infiltration rate on Horton infiltration curve. |
| fc (ILSAX) | The equilibrium infiltration rate on the Horton infiltration curve, reached once the soil is saturated. |
| K (ILSAX) | Decay constant associated with the soil. |
| fi (ILSAX) (Calculated) | (Result) The antecedent rainfall depth for the AMC and soil type determined from a predefined infiltration curve. |
| fo (ILSAX) (Calculated) | (Result) The initial infiltration rate based on the AMC and soil type determined from a predefined infiltration curve. |
| fc (ILSAX) (Calculated) | (Result) The final infiltration rate based on the AMC and soil type determined from a predefined infiltration curve. |
| K (ILSAX) (Calculated) | (Result) Shape factor determined from a predefined table of ILSAX parameters. |
| Accumulated Diminishing Infiltration (ILSAX) (Calculated) | (Result) The accumulated diminishing infiltration based on the ILSAX model parameters. |
| Initial Rate (ILSAX) (Calculated) | (Result) The initial infiltration rate determined from a predefined table of ILSAX parameters based on the AMC and soil type. |