Erosion and Sediment Pollution Control Program Manual.pdf

CHAPTER 15 - STREAMBANK STABILIZATION
Upon completion of work within a stream channel, disturbed areas must be stabilized to prevent erosion
before diverted flows are redirected into the disturbed area of the channel. The type of stabilization to
be used depends upon the size of the stream channel, its flow conditions, soils, and considerations for
migration of aquatic life. The form of bank protection should mimic the natural conditions as much as
possible, while providing sufficient protection for the anticipated flows from the design storm events.
There are many products and methods available to the designer. This chapter addresses some of the
most commonly used methods. These methods are also useful for lake shore restoration. Other
methods, unless specifically ruled out, will be considered on a case-by-case basis. For additional
information on the proper selection, design, and installation of streambank protection, the Department
recommends searching for “streambank protection” on the NRCS website
http://directives.sc.egov.usda.gov.
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Bank stabilization projects are often located on the outside banks of meanders. In such cases, it is
usually necessary to extend the protection a certain distance upstream and downstream of the affected
areas to prevent future scour. The minimum distances that the protection should be extended are
shown in Figure 15.2. Upstream and downstream ends must be keyed into the bank per General
Permit 3. Consideration should also be given to keying the bottom into the stream bed.
VEGETATION Seeding disturbed areas with a perennial grass seed mixture is a relatively inexpensive
means of achieving stabilization. In many cases, heartier vegetation, such as shrubs or other woody
plants, will be required to provide scour protection. The seed mixture and other vegetation chosen
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