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Att-Kin Routing Equivalency in HydroCAD?

Att-Kin Routing Equivalency in HydroCAD?

Att-Kin Routing Equivalency in HydroCAD?

I am reviving an old thread.  Is there any way to do the following now with the new routing procedures in HydroCAD (i.e. Muskingum-Cunge)?

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).  All of the reaches use an exponent of m = 1.  No other information, including any elevation or slope information, 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.

RE: Att-Kin Routing Equivalency in HydroCAD?

The NRCS has discontinued the use of Modified Att-Kin (MAK) in the Win/TR-20 Software, in favor of the new Muskingum-Cunge procedure.

For enchanced compatibility with Win/TR-20, the latest HydroCAD-8 release also provides Muskingum-Cunge reach routing.  For details see www.hydrocad.net/mc.htm

HydroCAD does not currently support the older MAK procedure.  Although MAK may be considered for a future update, it's use of the derived X and M parameters doesn't provide the complete reach cross-section needed for other HydroCAD calculations.

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