WORKSHOP ON PLAN OF ACTION FOR SCOUR CRITICAL BRIDGES

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WORKSHOP ON PLAN OF ACTION FOR SCOUR CRITICAL
BRIDGES
Transportation Research Board 2002 Annual
Meeting Sponsored By A2A03 Committee on
Hydrology, Hydraulics and Water Quality
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HEC-23 MATRIX FOR SELECTING COUNTERMEASURES
P.F. Lagasse, Ph.D., P.E. Transportation Research
Board 2002 Annual Meeting Sponsored By A2A03
Committee on Hydrology, Hydraulics and Water
Quality
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PURPOSE

• Identify stream instability and scour
  countermeasures implemented by various SHAs
• Develop a matrix which summarizes countermeasure
  application throughout the US.
• Provide design guidelines for selected
  countermeasures

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THE COUNTERMEASURES MATRIX

• COUNTERMEASURE GROUPS
• FUNCTIONAL APPLICATIONS
• SUITABLE RIVER ENVIRONMENT
• MAINTENANCE
• INSTALLATION EXPERIENCE BY STATE
• DESIGN GUIDELINE REFERENCES

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• THE COUNTERMEASURES MATRIX
• COUNTERMEASURE GROUPS

• GROUP 1 Hydraulic Countermeasures

• Group 1.A. River Training Structures
• Group 1.B. Armoring Countermeasures

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• THE COUNTERMEASURES MATRIX
• COUNTERMEASURE GROUPS

GROUP 2 Structural Countermeasures

• Foundation Strengthening
• Pier Geometry Modification

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• THE COUNTERMEASURES MATRIX
• COUNTERMEASURE GROUPS

GROUP 3 Monitoring

• Fixed Instrumentation
• Portable Instrumentation
• Visual Monitoring

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• THE COUNTERMEASURES MATRIX
• FUNCTIONAL APPLICATIONS

• l Well Suited / Primary Use
• w Possible Application / Secondary Use
• Unsuitable / Rarely Used
• N/A Not Applicable

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THE COUNTERMEASURES MATRIX Suitable River
Environment

• Bed Material
• Ice / Debris Load
• Bank Condition
• Floodplain (Width)

• River Type
• Stream Size (Width)
• Bend Radius
• Flow Velocity

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• HEC-23 DESIGN GUIDELINES

• Design Guideline 1 - Bendway Weirs/ Stream Barbs
• Design Guideline 2 - Soil Cement
• Design Guideline 3 - Wire Enclosed Riprap
  Mattress
• Design Guideline 4 - Articulated Concrete Blocks
• Design Guideline 5 - Grout Filled Mattresses
• Design Guideline 6 - Concrete Armor Units

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• HEC-23 DESIGN GUIDELINES

• Design Guideline 7 - Grout/Cement Filled Bags
• Design Guideline 8 - Rock Riprap at Abutments
  Piers
• Design Guideline 9 - Spurs
• Design Guideline 10 - Guide Banks
• Design Guideline 11 - Check Dams/ Drop
  Structures
• Design Guideline 12 - Revetments

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• DESIGN GUIDELINE 1
• Bendway weirs / Stream barbs

• Sources
• Colorado Department of Transportation
• Washington State Department of Transportation
• NRCS
• U.S. Army Corps of Engineers
• Application
• Bankline protection and flow alignment in
  meandering channel bends

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• DESIGN GUIDELINE 2
• Soil Cement

• Sources
• Portland Cement Association
• Pima County Department of Transportation
• Maricopa County, Arizona
• Application
• Revetment for banklines and sloping abutments,
  drop structures and bed armor

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• DESIGN GUIDELINE 3
• Wire Enclosed Riprap Mattress

• Sources
• New Mexico State Highway and Transportation
  Department
• Application
• Revetment for banklines, guidebanks, and sloping
  abutments

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• DESIGN GUIDELINE 4
• Articulated Concrete Block System

• Sources
• Hydro Review and Hydraulic Engineering 93
• Maine Department of Transportation
• Minnesota Department of Transportation
• Application 1
• Bankline and abutment revetment and bed armor
• Application 2
• Pier scour protection

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• DESIGN GUIDELINE 5
• Articulating Grout Filled Mattress

• Sources
• Oregon Department of Transportation
• Arizona Department of Transportation
• Application
• Bankline and abutment revetment and bed armor

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• DESIGN GUIDELINE 6
• Concrete Armor Units

• Sources
• Pennsylvania Department of Transportation and
  Tested at Colorado State University
• A-Jacks Testing Manual (CSU)
• and Design Manual (Ayres Associates)
• Application
• Pier scour and abutment scour protection

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• DESIGN GUIDELINE 7
• Grout / Cement Filled Bags

• Sources
• Maryland State Highway Administration
• Maine Department of Transportation
• Application
• Protection of undermined areas at piers and
  abutments and bed armor

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