CHAPTER 8
INDIRECT TECHNIQUES FOR EROSION PROTECTION
As in the previous chapter, descriptive information for most techniques presented in
this chapter is generally followed by a discussion of advantages, disadvantages, typical
applications, and design considerations as appropriate. In order to minimize redundancy,
these topics are discussed at the broadest possible level in the hierarchy of the text; in other
words, aspects which are shared by all techniques are discussed at the beginning of the
chapter; aspects which are shared by a group of techniques are discussed at the group level;
aspects that are peculiar to a smaller category of techniques, or to a single technique, are
discussed at the appropriate level of specificity.
The extent of the discussion of specific techniques ranges from detailed design
guidance to a brief description for some specialized techniques. Therefore, a complete
understanding of a specific technique requires perusal of all material at a broader level in the
text, as well as material peculiar to that technique.
The following paragraphs outline the general description, advantages, and
disadvantages for most indirect techniques used in bank stabilization methods:
Indirect protection structures extend into the stream channel, and redirect the
flow so that hydraulic forces at the channel boundary are reduced to a
non-erosive level. Indirect protection techniques can be classified as follows:
Dikes and Retards
Dikes
Permeable dikes
Impermeable dikes
Retards
Permeable retards
Impermeable retards
Other Flow Deflectors
Bendway weirs
Iowa vanes
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