Based on these guidelines, a systematic approach to initiating, planning, analyzing, implementing,
and monitoring of channel rehabilitation projects is presented in the following sections. Although
implementation, which includes detail engineering design, construction, and inspection, is briefly presented
in these guidelines; detail design is beyond the scope of this manual. Construction and inspection guidelines
are usually specific to the agency funding the construction and are not embodied in this manual.
Four flowcharts are presented to introduce the generalized methodology of channel rehabilitation,
analysis, the systems approach, and for preliminary design. The intent of the flowcharts is to lead the reader
through the process of project initiation, analysis, and design, and in the following Chapters 3 through 6 the
intent is to provide the reader with a discussion of the methods to be used.
THE GENERALIZED PROCESS
The generalized flowchart for channel rehabilitation design is presented in Figure 2.1. The flowchart
describes the complete flowchart from initiation to monitoring of the final constructed project. Steps in the
generalized flowchart are discussed in the following sections, and, in some cases, separate steps are
expanded to autonomous flowcharts.
The initiation of the project must include organization of a team, problem identification, and
establishment of goals. The team members must comprise a group who is knowledgeable of the potential
beneficial uses of the site, and of the techniques and costs associated with rehabilitation. For example,
biologists, geomorphologists, engineers, recreation specialists, and representatives of the adjacent
landowners and the community are typical of team members required for a channel rehabilitation planning
The number of team members should be as small as reasonably possible, which can be expanded
as a viable project is identified and consideration of additional factors is necessary. For example the initial
team may be very technically oriented in geology, biology, and engineering. As economic and social factors
become relevant, additional members of the community and local government are essential.
Problem identification is an essential step in the initiation phase. Identification of the interrelationship
of the problems is an essential feature of a system analysis methodology. By understanding the complete
watershed, reliable solutions can be identified. Typically, watersheds have the following types of problems:
a. Upland watershed erosion;
b. Channel incision and bank instability;