Category 2
This category contains the parameters that can generally be derived from a hydrograph analysis or from physiographic information about the watersheds.
These parameters should require little if any adjustment as part of the calibration process.
- SMIX - The maximum value of the surface moisture index represents the size of interception, depression, and surface moisture storage.
In general, significant surface runoff doesn't occur until SMI = SMIX.
The correct general magnitude of this parameter is important, but the results do not appear to be sensitive to small changes in the value of SMIX.
A reasonable estimate of SMIX can usually be derermined by finding the amount of precipitation needed to cause surface runoff after a dry period in the summer.
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The parameters of the basic Continuous API Model can be divided into 3 categories.