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BRIDGESBRIDGES
Lan Zi Road,
Lan Gao, China
Structural Capacity
Hydraulic Capacity
Safety
Scour ProtectionScour Protection
Failed during 6” StormFailed during 6” Storm
(50 Year Event)(50 Year Event)
10 Killed10 Killed
New York- (1955- 1987)New Y...
What is importantWhat is important
• Structural Capacity/Load
• Hydraulic Capacity
• Structure-Stream Compatibility/Adequa...
LOW-WATER CROSSINGLOW-WATER CROSSING
(FORDS, DRIFTS)(FORDS, DRIFTS)
Where to Use a
Low-Water Crossing
• Flashy Flows/High Flow Fluctuation
• Low Traffic Use
• Delays are Acceptable/Non-criti...
Aspects of Low-Water CrossingAspects of Low-Water Crossing
DesignDesign
• *Structure-Site Compatibility*Structure-Site Com...
Structure-Site Compatibility
Providing for
Aquatic Organism Passage
K. Clarkin
Problematic Designs
Roadway and Site GeometryRoadway and Site Geometry
Site Hydrology andSite Hydrology and
Hydraulic DesignHydraulic Design
Scour and Bank ProtectionScour and Bank Protection
Driving SurfaceDriving Surface
Structural DesignStructural Design
Traffic Control and SafetyTraffic Control and Safety
USGS
Materials SelectionMaterials Selection
•Provide for
AOP
•Keep Stream
Function
SUMMARY
•Design it Well!
TWarhol
http://fsweb.sdtdc.wo.fs.fed.us/pubs/pdf/LowWaterCrossings/
Roy Gu. 2003. Low water Crossing Study, FHWA, DTFH68-02-C-00024
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
6. lvrm ch9 10 ukraine lwx-bridges
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6. lvrm ch9 10 ukraine lwx-bridges

  1. 1. BRIDGESBRIDGES
  2. 2. Lan Zi Road, Lan Gao, China
  3. 3. Structural Capacity
  4. 4. Hydraulic Capacity
  5. 5. Safety
  6. 6. Scour ProtectionScour Protection
  7. 7. Failed during 6” StormFailed during 6” Storm (50 Year Event)(50 Year Event) 10 Killed10 Killed New York- (1955- 1987)New York- (1955- 1987) 150 Meters long- 5 Spans150 Meters long- 5 Spans
  8. 8. What is importantWhat is important • Structural Capacity/Load • Hydraulic Capacity • Structure-Stream Compatibility/Adequate Span • A Good Foundation • Scour Protection • Safety Features • Structure Inspection and Maintenance
  9. 9. LOW-WATER CROSSINGLOW-WATER CROSSING (FORDS, DRIFTS)(FORDS, DRIFTS)
  10. 10. Where to Use a Low-Water Crossing • Flashy Flows/High Flow Fluctuation • Low Traffic Use • Delays are Acceptable/Non-critical Route • Broad/Flat Channels (Slightly Entrenched) • Debris Prone Channels • Grade Control Structures/Barriers • $$$-Least Expensive Alternative
  11. 11. Aspects of Low-Water CrossingAspects of Low-Water Crossing DesignDesign • *Structure-Site Compatibility*Structure-Site Compatibility • *Providing for Aquatic Organism Passage (AOP)*Providing for Aquatic Organism Passage (AOP) • Roadway and Site GeometryRoadway and Site Geometry • Site Hydrology-Design High and Low FlowsSite Hydrology-Design High and Low Flows • Hydraulic Design-Capacity, VelocitiesHydraulic Design-Capacity, Velocities • Scour and Bank ProtectionScour and Bank Protection • Driving Surface Structural DesignDriving Surface Structural Design • Traffic Control and SafetyTraffic Control and Safety • Materials SelectionMaterials Selection • BMPs for Erosion Control and Water QualityBMPs for Erosion Control and Water Quality
  12. 12. Structure-Site Compatibility
  13. 13. Providing for Aquatic Organism Passage K. Clarkin
  14. 14. Problematic Designs
  15. 15. Roadway and Site GeometryRoadway and Site Geometry
  16. 16. Site Hydrology andSite Hydrology and Hydraulic DesignHydraulic Design
  17. 17. Scour and Bank ProtectionScour and Bank Protection
  18. 18. Driving SurfaceDriving Surface Structural DesignStructural Design
  19. 19. Traffic Control and SafetyTraffic Control and Safety
  20. 20. USGS
  21. 21. Materials SelectionMaterials Selection
  22. 22. •Provide for AOP •Keep Stream Function SUMMARY •Design it Well!
  23. 23. TWarhol
  24. 24. http://fsweb.sdtdc.wo.fs.fed.us/pubs/pdf/LowWaterCrossings/ Roy Gu. 2003. Low water Crossing Study, FHWA, DTFH68-02-C-00024

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