The Modified Puls routing method ("Figure: Reach Editor - Modified Puls Routing Method") describes the reach as a series of cascading reservoirs, the number of which is specified by the Number of Subreaches. The outflow from the reach is defined as a function of storage in the reach. The parameters for defining the Modified Puls routing method are described below:
Storage and Outflow—Enter a monotonically increasing set storage and outflow values to describe the storage-outflow relationship needed for this routing method. HINT: An HEC-RAS steady-flow model can be used to develop a Storage-Outflow relationship for use in this method.
Number of Subreaches—This parameter is similar to that used in the Muskingum routing method. Enter the reach travel time divided by the computation interval.
Channel Losses—An option to compute Channel Losses due to seepage within the routing computation is included in the edit panel for the Modified Puls routing method. The data required to use this option includes Elevation data associated with the Storage values in the Storage-Outflow table, an average Invert Elevation for the reach, and a Percolation (or Seepage) Rate. However, the Channel Losses option and all the associated data entry fields have been disabled in this version. See the Losses tab of the Reach Editor to learn how to define channel losses that are computed independently of the routing method.
