Topic outline

  • NRCS: Techniques for Changing Channel Flow

    Credits: 2 PDH

    PDH Course Description:

    Flow changing devices are a broad category of structures that can be used to divert flow away from eroding banks. They are often used to shield banks from eroding flows, build up the toe of the bank, and direct flows to create a stable alignment. While this course provides descriptions of a variety of techniques, the primary focus is on the analysis, design, and installation of stream barbs.

    This supplement draws on recent field evaluations that focused both on projects where these structures have performed satisfactory, as well as areas where the performance has been less than satisfactory. A design description includes cautions and warnings related to specific design features. Finally, a step-by-step design procedure for stream barbs is also provided..

    Topics:

    • Intro to Flow-changing Techniques
    • Spur dikes, Jetties, Groins
    • Pin deflectors, bendway weirs, stream barbs
    • Hydraulic function and design criteria for stream barbs
    • Cost and construction considerations

    Stream Barb Design Criteria for:
    • bank erosion
    • channel stability
    • Location
    • bend radius
    • angle
    • length
    • number and spacing
    • profile
    • height and width
    • lenfth to bank key
    • depth of the bed key
    • scour hole development
    • rock size
    • use of woody debris

    To take this course:

    1.) Enroll in Course: Click below to enroll:
    (must be logged into your user account)


    2.) Study: Once enrolled, click below to begin the course:

    Download the Study Guide

    3.) Test: Once you've thoroughly read the course materials, please click below to take the final examination.

    Take the final exam

    4.) Certificate: A passing grade of 70% or higher on the exam, is required to receive the certificate of completion for this PDH course.
         NOTE: After the exam is completed, you will need to return to this page, in order to print (download) the certificate of completion.

    Print the Certificate of Completion

    Intended Audience: This course is intended for Geotechnical, Civil, Environmental, Water Resources, and other engineers whose job description requires a general knowledge of applications and design procedures for the control and alteration of channel flow.
    Publication Source: USDA (Natural Resources Conservation Services)

    Donald Parnell, PE

    • Topic 1