The Working R&D routing method ("Figure: Reach Editor - Working R&D Routing Method") uses a nonlinear storage-outflow relation, like the Modified Puls method, but it adds the concept of wedge storage, like the Muskingum method. For a linear storage-outflow relation, the Working R&D method produces results identical to the Muskingum method. For routing with no wedge storage (Muskingum X = 0), the Working R&D method produces results identical to the Modified Puls method (USACE, 1994).
This method is not widely used. In fact, it has been so long since anyone used it that no one noticed that the Storage-Outflow table has been disabled. This will be corrected in the next release (or patch) of the software.
Figure: Reach Editor - Working R&D Routing Method
Storage and Outflow—Use a monotonically increasing set of storage and outflow values to describe the storage-outflow relationship needed for this routing method.
Muskingum X—The attenuation coefficient used in the wedge storage computations (from 0.0 to 0.5). A value of 0.0 indicates maximum attenuation of the hydrograph through the routing reach. A value of 0.5 indicates a "direct translation" of the hydrograph through the reach.
Number of Subreaches—The number of steps (subreaches) applicable for the routing reach. This parameter should be approximately equal to travel time divided by the computation interval.
