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Printable version of this memo (.pdf, 39 kb)
 | Memorandum |
| U.S. Department of Transportation |
| Federal Highway Administration |
| Subject: |
ACTION: Distribution of FHWA Hydraulic Engineering Circular 23 |
Date: December 16, 2009 |
| From: |
/S/ Original signed by
Thomas Everett for
M. Myint Lwin, P.E., S.E.
Director, Office of Bridge Technology |
In Reply Refer To: HIBT-20 |
| To: |
Directors of Field Services
Federal Lands Highway Division Engineers
Division Administrators |
The FHWA Office of Bridge Technology, Resource Center, and National Highway Institute would like to announce the completion of Hydraulic Engineering Circular (HEC) 23 "Bridge Scour and Stream Instability Countermeasures; Experience, Selection, and Design Guidance - Third Edition" which consists of two volumes. The first volume provide significantly expanded guidance on:
- The development of Plans of Actions (POAs) for scour critical bridges,
- An updated scour selection matrix that includes hydraulic countermeasures, structural countermeasures, biotechnical countermeasures, and monitoring,
- An updated section on riprap design, filters, failure modes, and alternatives,
- A new section on biotechnical engineering, and
- A revised section on scour monitoring and instrumentation.
The second volume presents 19 design guidelines broken into six sections. A number of the design guidelines have been significantly updated and there are four completely new procedures.
- Section 1 - Countermeasures For Stream Instability
- Design Guideline 1 - Bendway Weirs/Stream Barbs
- Design Guideline 2 - Spurs
- Design Guideline 3 - Check Dams/Drop Structures
- Section 2 - Countermeasures For Streambank And Roadway - Embankment Protection
- Design Guideline 4 - Riprap Revetment
- Design Guideline 5 - Riprap Design for Embankment Overtopping
- Design Guideline 6 - Wire Enclosed Riprap Mattress
- Design Guideline 7 - Soil Cement
- Design Guideline 8 - Articulating Concrete Block Systems
- Design Guideline 9 - Grout-Filled Mattresses
- Design Guideline 10 - Gabion Mattresses
- Section 3 - Countermeasures For Bridge Pier Protection
- Design Guideline 8 - Articulating Concrete Block Systems at Bridge Piers
- Design Guideline 9 - Grout-Filled Mattresses at Bridge Piers
- Design Guideline 10 - Gabion Mattresses at Bridge Piers
- Design Guideline 11 - Rock Riprap at Bridge Piers
- Design Guideline 12 - Partially Grouted Riprap at Bridge Piers
- Section 4 - Countermeasures For Abutment Protection
- Design Guideline 13 - Grout/Cement Filled Bags
- Design Guideline 14 - Rock Riprap at Bridge Abutments
- Design Guideline 15 - Guide Banks
- Section 5 - Filter Design
- Design Guideline 16 - Filter Design
- Section 6 - Special Applications
- Design Guideline 17 - Riprap Design for Wave Attack
- Design Guideline 18 - Riprap Protection for Bottomless Culverts
- Design Guideline 19 - Concrete Armor Units
This edition of HEC-23 is available from the Office of Bridge Technology's Web site and is now available for downloading at www.fhwa.dot.gov/engineering/hydraulics/pubs/09111/index.cfm.
HEC-23 is the primary reference material for the NHI Course NHI 135048 - "Countermeasure Design for Bridge Scour and Stream Instability" which has been updated to incorporate the HEC-23 enhancements. A description of the course, information on scheduling, and information on how to obtain hard copies of HEC-23 from the NHI store can be found at the following internet location http://www.nhi.fhwa.dot.gov
If you have any questions, please contact Dr. Larry Arneson at the FHWA Resource Center at (720) 963-3200 or Mr. Joe Krolak at the Office of Bridge Technology at (202) 366-4611.
cc:
Larry Arneson-RCM-LKWD
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