I am updating a TR-20 watershed for a large watershed in HydroCAD. There are several reaches defined in the TR-20 model. TR-20 uses the Att-Kin reach routing procedure and describes these reaches with a length (L), end area coefficient (x), and an exponent (m). TR-20 uses these parameters to define a rating curve for the given reach. All of the reaches use an exponent of m = 1. No other information, including any elevation or slope informatio, is given regarding the reaches. Does anyone have any experience with this? In what manner can I model the reaches in HydroCAD? I need to model these reaches without gathering or estimating any more parameters than are included in the TR-20 model. Thanks.
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