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July 2008. 2. Objectives. Present TCHH Activities, Especially those Centered on the 2011 AASHTO Drainage Manual and H
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1. 1 AASHTO Subcommittee On Design (SCOD) Annual Meeting
July 2008
Michael Fazio, Chair
Technical Committee on Hydrology and Hydraulics
2. July 2008 2 Objectives Present TCHH Activities, Especially those Centered on the 2011 AASHTO Drainage Manual and H&H Research.
Talk about TCHH Future Opportunities
3. July 2008 3 TCHH – Who we are
TCHH - Brief History
TCHH - Charter
2010 AASHTO Drainage Manual
Research
Challenges and Opportunities
4. July 2008 4 TCHH
5. July 2008 5 Membership Stats Total Number of Members – 23
Longest service period – 17 years
Average service period – 7 years
Number of Hydraulics Engineers - 17
6. July 2008 6
7. July 2008 7
8. July 2008 8 Brief History 1969 AASHO Committee on Design commissioned the Exec. Committee to publish a drainage design manual
Ten states from the Committee on Design were selected to complete the assignment, with the representation of the Bureau of Public Road (BPR)
State drainage/hydraulics engineers from the selected ten states were delegated to serve in the subcommittee, then re-designated a task force
9. July 2008 9 Brief History 1970 - The first meeting of the AASHO Subcommittee (later named Task Force) on Hydrology and Hydraulics was held in Dallas, Texas
1973 – AASHO becomes AASHTO
Several drainage guides published from 1970 on
1987 – The guides were collected in the “Red” guide (color of the cover), titled “Highway Drainage Guidelines”
1992 – The “Green” guide was published
10. July 2008 10 Brief History 1991 – The first Model Drainage Manual was published after five years of work – The manual featured double parenthesis to allow states to adapt contents to their needs
2005 – Metric Model Drainage Manual published
11. July 2008 11 1970 Charter and Objectives To maintain a working group with expertise in hydrology and hydraulics to develop AASHTO guidance and policy on drainage design and related issues
12. July 2008 12 Current Charge Statement
13. July 2008 13 1970 Goals Develop and update guidelines and procedures for highway drainage
Make a periodic evaluation of all AASHTO publication and policy related to drainage
Advise the subcommittee on Design regarding proposed drainage related policies
Provide liaison with researchers to improve implementation of new ideas and encourage research
Maintain and update the model drainage manual
Identify training needs and provide guidance on curriculum
Identify, coordinate and recommend software
Identify technology needs for FHWA
Promote Technology Transfer to improve implementation of new ideas
14. July 2008 14 2005 Model Drainage Manual (MDM)Dual Units
15. July 2008 15 2005 MDM Flexible and Adaptable
Double Parenthesis for Agency’s Name
Includes 20 Chapters
Dual Units
New Glossary
Many new Figures and Graphs
16. July 2008 16
17. July 2008 17 2005 MDMFacts Bulky
Hard to use
Limited sales
Dual units
Redundancy
Some outdated information
18. July 2008 18 MDM Resolution Because of poor sales, TCHH revisited the MDM objectives, deciding to publish a new manual that would be more practical, easy to use and updated.
Results: two-part manual, with part I on Policies and part II on Procedures
Parts of the manual to be sold separately
19. July 2008 19 AASHTO Drainage Manual - Revision Revisions Objectives:
1. Make the Manual Authoritative
2. Expand the usefulness to a broader audience, make the manual more user friendly, reduce the clutter and make it more accessible.
20. July 2008 20 2011 AASHTO Drainage ManualFeatures The Policy Part is rarely revised
The Procedures Part is dynamically updated
Chapters can be bundled and sold separately
Duplication removed
One language throughout the manual
Remove outdated information, practices and methods
New Chapters on Wetlands and Groundwater
21. July 2008 21 2011 AASHTO Drainage ManualFeatures Use of “should”
Single U.S. units
New research to be part of the manual appendices
Other FHWA publication to be part of appendices
No more model manual or two parenthesis
22. July 2008 22 Manual Disclaimer To manage possible conflicts with existing standards published by other federal or state agencies, the following statement will be placed in the manual:
“This manual has been written to provide recommended minimum desired criteria”
23. July 2008 23 Plan
24. July 2008 24 Revision Progress
25. July 2008 25 Funding
26. July 2008 26 TCHH Sponsored Research TCHH prepares and shortlists research problem statements to submit to SCOD and NCHRP
TCHH supports and works closely with FHWA Hydraulics Lab
Currently several TCHH members serve seven NCHRP research projects
Research findings are being implemented as changes to policies and practices
27. July 2008 27 Research The NCHRP research project include:
One on hydrology
Four on bridge scour
One on culvert rehabilitation methods and policies
One on stream stabilization using “natural structures”
28. July 2008 28 Research Some projects the FHWA Hydraulics Lab (Sterling Jones) is working on are:
Improving stream shear stress calculations
Improving deck profile for submergence flow
Fish passage
Scour measurement instrumentations
29. July 2008 29 Challenges and Opportunities NPDES II
Decaying drainage infrastructure
Plan of Action for Scour Critical Bridges
Adding capacity to the highways
EPA Permits
Flooding risks
DOT Organizational Changes
30. July 2008 30 Decaying Infrastructure
31. July 2008 31 Conclusions TCHH is a group of dedicated professionals
TCHH works under SCOD
TCHH is goal oriented
2011 AASHTO Drainage Manual to be more user friendly and authoritative
TCHH supports national research on hydrology and hydraulics
32. July 2008 32 “The Task Force provided a forum where members could discuss their problems with others who had similar technical and creditability problems…This process of sharing information and learning through the experience of other members continues to be an important benefit of serving on the Task Force.”
Mainard Wacker, P.E., History of the AASHTO Task Force on Hydrology and Hydraulics, October 1993
33. July 2008 33
34. July 2008 34
35. July 2008 35 Research NCHRP 15-36, Estimating Joint Probabilities of Design Coincident Flows at Stream Confluences (estimated completion is Spring 2009)
NCHRP 24-15(2), Bridge Scour in Cohesive Materials– (estimated completion is 06/2008).
NCHRP 24-27, Recommendations for the Adoption of Bridge Scour Research by State Highway Agencies –Panel decided to break project in three parts: abutments, piers and geomorphology.
NCHRP 24-29, Scour at Bridge Foundations on Rock. (estimated completion: June 2010)
NCHRP 24-32, Scour at Wide Piers and Long Skewed Piers.
NCHRP 24-33, Development of Design Methods for In-Stream Control Structures (estimated completion Spring 2011).
NCHRP 14-19, Culvert Rehabilitation to Maximize Service Life While Minimizing Direct Costs and Traffic Destruction (estimated completion Fall 2010)
36. July 2008 36 NCHRP 24-15(2) A benefit of the cohesive soils scour would be a
realistic analysis in soils where there is some resistance to scour. see this a means to reduce scour for sites where the frequency and
duration of flows are less and the soil is quite resistant. For long
durations and less resistant soils, there may not be as much benefit.
37. July 2008 37 NCHRP 15-24 – Culvert Coefficients Update Final Stages
Provides information on additional culvert features which were not addressed in the original Bureau of Standards testing in the 1950's. (multiple culverts evaluation)
Some of the results will be incorporated in the updated HY-8.
38. July 2008 38 NCHRP 15-36, Estimating Joint Probabilities of Design Coincident Flows at Stream Confluences Currently designer use USACE table for coincident flow
Table may not be very reliable across USA
This project will provide guidance for properly designing a drainage structure near or at a stream confluence
39. July 2008 39 NCHRP 24-32, Scour at Wide and Long Skewed Piers The objective of this research is to develop methods and procedures for predicting time-dependent local scour at wide piers and at long skewed piers in non-cohesive soils and steady flow. Improvements to scour estimates could save money by reducing over prediction of scour for large or skewed pier situations.
This project improves scour prediction at wide bridge piers. Current national equations grossly over-predict scour at wide piers, resulting in wasteful bridge substructure designs.
40. July 2008 40 NCHRP 24-33, Development of Design Methods for In-Stream Flow Control Structures Evaluate the potential of in-stream structures for protecting bridges and embankments
Develop design methods for properly placing in-stream structures
41. July 2008 41 NCHRP 24-27, Evaluation of all Scour Research for Design and Policy Implementation Significant improvement in scour prediction practice adopted from this research will safely reduce bridge substructure costs.
Project 14-19, Culvert Rehabilitation to Maximize Service Life: this project will produce a handbook to address pipe repair decisions, including assessing the conditions of existing pipe and factors affecting the choice of repair methodology. The project will also develop a training course and repair specifications. Repair methodologies and issues such as grouts, pipe voids, joint seals, etc. will be addressed. States currently lack guidance in these areas.
42. July 2008 42 NCHRP, 24-29, Scour of Degradable Rock This project will improve scour prediction in rock, allowing significant savings through more reasonable scour predictions.
43. July 2008 43 NCHRP 14-19, Culvert Rehabilitation to Maximize Service Life States currently lack guidance in these areas.
Produce a handbook to address pipe repair decisions, including assessing the conditions of existing pipe and factors affecting the choice of repair methodology.
Develop a training course and repair specifications. Repair methodologies and issues such as grouts, pipe voids, joint seals, etc. will be addressed.
44. July 2008 44 20-07 Project on Pipe Material Selection (upcoming) Examine national research on pipe materials selection, providing preliminary guidance and identifying areas of needed research. Currently, little national guidance is available in this area.