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Hydraulics Engineering


Debris Control Structures Evaluation and Countermeasures
Hydraulic Engineering Circular No. 9

1. Report No.
2. Government Accession No. 3. Recipient's Catalog No.
4. Title and Subtitle

Debris Control Structures - Evaluation and Countermeasures
Hydraulic Engineering Circular 9
Third Edition
5. Report Date

September 2005
6. Performing Organization Code
HIBT-20, HFL-15
8. Performing Organization Report No.

7. Author(s)
J.B. Bradley, D.L. Richards, C.D. Bahner
9. Performing Organization Name and Address

WEST Consultants, Inc.
2601 25th Street
Suite 450
Salem, Oregon 97302
10.   Work Unit ( TRAIS)
11. Contract or Grant No.
13. Type of Report and Period Covered
Final Report
12. Sponsoring Agency Name and Address
Office of Bridge Technology
FHWA, Room 3203
1200 New Jersey Avenue SE
Washington, D.C. 20590

National Highway Institute
4600 North Fairfax Dr., Suite 800
Arlington, Virginia 22203
14. Sponsoring Agency Code
15. Supplementary Notes
Project Manager: Brian Beucler, FHWA
Technical Assistants: Joe Krolak, Abbi Ginsberg, Jorge E. Pagán-Ortiz, FHWA; Arthur Parola, University of Louisville
16.  Abstract
This circular provides information on debris accumulation and the various debris control countermeasures available for culvert and bridge structures. It is a dual unit update of the first edition published in 1964. This circular presents various problems associated with debris accumulation at culvert and bridge structures, provides a procedure for estimating the potential of debris accumulating at a bridge structure, and provides general guidelines for analyzing and modeling debris accumulation on a bridge structure to determine the impacts that the debris would have on the water surface profile through the bridge structure and the hydraulic loading on the structure. Various types of debris countermeasures for culvert and bridge structures are discussed within this circular. General criteria for selection of these countermeasures and general design guidelines for some of the structural measures are also included in this manual.
17. Key Words
debris accumulation, debris, culverts, bridges, hydraulic loading, debris-control structures, debris impacts, debris countermeasures, debris management, debris classification
18. Distribution Statement
This document is available to the public from The National Technical Information Service Springfield, VA 22151 (703) 487-4650
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


Updated: 09/22/2014

United States Department of Transportation - Federal Highway Administration