Regional Application of Stream Classification Systems in Planning and Design of Streambank Stabilization Projects

In the author's regional fluvial geomorphology responsibilities at the National Technical Centers (NTC) of the Natural Resources Conservation Service (NRCS), and as consultants in retirement, they have done numerous geomorphic evaluations on hundreds of miles of streams across the United States. They typically applied three different stream classification systems: (1) Rosgen, (2) Simon or Schumm, Harvey, and Watson Channel Evolution Models (CEM), and (3) Montgomery and Buffington (Stream Planform Types). They have been using the Rosgen stream classification system for 19 years and have applied it in 22 different states. All three systems have been found to be robust at the stream reach level. The authors have taught these systems to hundreds of participants in applied fluvial geomorphology training sessions. Participants were able to take appropriate measurements or make observations to identify stream types. Plots of bankfull width and depth versus drainage area were drafted at most training locations to demonstrate the application of regional curves. One advantage of the Rosgen classification system is that users collect the data needed to make planning and design decisions for streambank stabilization projects. The Rosgen stream classification system, in combination with CEM, can be used to identify stream processes, predict trends in channel stability, and suggest bank treatment strategies. In summary, the Rosgen, CEM, and Montgomery and Buffington stream classifications can be applied to streams across the United States. The data collected and the resulting classifications help planners make sound decisions for streambank stabilization projects.