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Hydraulics Engineering


Design of Roadside Channels with Flexible Linings
Hydraulic Engineering Circular Number 15, Third Edition

Technical Report Documentation Page

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1. Report No.
HEC 15
2. Government Accession No. 3. Recipient's Catalog No.
4. Title and Subtitle
Design of Roadside Channels with Flexible Linings
Hydraulic Engineering Circular Number 15, Third Edition
5. Report Date
September 2005
6. Performing Organization Code
8. Performing Organization Report No.

7. Author(s)
Roger T. Kilgore and George K. Cotton
9. Performing Organization Name and Address
Kilgore Consulting and Management
2963 Ash Street
Denver CO 80207

10. Work Unit ( TRAIS)
11. Contract or Grant No.
DTFH 61-02-D-63009/T-63044
12. Sponsoring Agency Name and Address
Federal Highway Administration

National Highway Institute
4600 North Farifax Drive
Suite 800
Arlington, Virginia 22203

Office of Bridge Technology
1200 New Jersey Avenue SE, Room 3202
Washington D.C. 20590
13. Type of Report and Period Covered
Final Report (3rd Edition)
April 2004 - August 2005
14. Sponsoring Agency Code
15. Supplementary Notes
Project Manager: Dan Ghere - FHWA Resource Center
Technical Assistance: Jorge Pagan, Joe Krolak, Brian Beuclear, Sterling Jones, Philip L. Thompson (consultant)

Flexible linings provide a means of stabilizing roadside channels. Flexible linings are able to conform to changes in channel shape while maintaining overall lining integrity. Long-term flexible linings such as riprap, gravel, or vegetation (reinforced with synthetic mats or unreinforced) are suitable for a range of hydraulic conditions. Unreinforced vegetation and many transitional and temporary linings are suited to hydraulic conditions with moderate shear stresses.

Design procedures are given for four major categories of flexible lining: vegetative linings; manufactured linings (RECPs); riprap, cobble, gravel linings; and gabion mattress linings. Design procedures for composite linings, bends, and steep slopes are also provided. The design procedures are based on the concept of maximum permissible tractive force. Methods for determination of hydraulic resistance applied shear stress as well as permissible shear stress for individual linings and lining types are presented.

This edition includes updated methodologies for vegetated and manufactured lining design that addresses the wide range of commercial products now on the market. This edition also includes a unified design approach for riprap integrating alternative methods for estimating hydraulic resistance and the steep slope procedures. Other minor updates and corrections have been made. This edition has been prepared using dual units.

17. Key Words
channel lining, channel stabilization, tractive force, resistance, permissible shear stress, vegetation, riprap, manufactured linings, RECP, gabions.
18. Distribution Statement
This document is available to the public from the National Technical Information Service, Springfield, Virginia 22151.
19. Security Classif. (of this report) Unclassified 20. Security Classif. (of this page)
21. No. of Pages
22. Price

Form DOT F 1700.7 (8-72) Reproduction of completed page authorized

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Updated: 09/22/2014

United States Department of Transportation - Federal Highway Administration