WMS:HEC-1 Muskingum (RM)

From XMS Wiki - http://wikis.aquaveo.com/xms/

The Muskingum method is dependent primarily upon an input weighting factor. The parameters along with short descriptions of their meanings follow:

• NSTPS - The number of integer steps for the Muskingum routing.

• AMSKK - Muskingum K coefficient in hours for entire reach.

• X - Muskingum x coefficient.

Using the basin data computed by WMS when a TIN or DEM is used to delineate the watershed, the AMSKK and NSTPS coefficients can easily be estimated. AMSKK is essentially the travel time for the reach, which can be estimated by noting the length of the stream segment (displayed in the Muskingum Cunge dialog even though it is dimmed) and multiplying by an assumed channel velocity (1-5 ft/s would be appropriate for most natural channels). Of course you will need to convert the estimated travel times from seconds to hours before entering it into the AMSKK edit field. The NSTPS value is the number of time steps the flood wave is in the channel and can be determined by dividing AMSKK by the computational time step found in the Job Control dialog (again, be sure that units are consistent).

Related Topics

• Editing HEC-1 Parameters
• Defining a Routing Method