General Design Considerations for Bank Protection

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General Design Considerations for Bank Protection

• By
• David S. Biedenharn

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Streambank Protection Basic Design Considerations

• Geomorphology
• Beginning ending points, and alignment
• Hydraulics
• Design Q
• Variations in stage and discharge
• Tractive force and secondary currents
• Toe Scour protection
• Top elevation of protection
• Waves and vessel forces
• Geotechnical Design
• Environmental considerations
• Toe Protection
• Surface Drainage
• Manufacturers recommendations
• Safety factors

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Streambank Protection Basic Design Considerations

• Geomorphology
• Beginning ending points, and alignment
• Hydraulics
• Design Q
• Variations in stage and discharge
• Tractive force and secondary currents
• Toe Scour protection
• Top elevation of protection
• Waves and vessel forces
• Geotechnical Design
• Environmental considerations
• Toe Protection
• Surface Drainage
• Manufacturers recommendations
• Safety factors

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Where to start and stop protection?
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Flanked Bank Protection
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Alignment of Protection Works?
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Restoration of Old Planform?
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Channel Restoration
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Streambank Protection Basic Design Considerations

• Geomorphology
• Beginning ending points, and alignment
• Hydraulics
• Design Q
• Variations in stage and discharge
• Tractive force and secondary currents
• Toe Scour protection
• Top elevation of protection
• Waves and vessel forces
• Geotechnical Design
• Environmental considerations
• Toe Protection
• Surface Drainage
• Manufacturers recommendations
• Safety factors

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Variations in Stage and Discharge
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Permissible Tractive Force or Velocity

• Have been quantified for riprap and some
  manufactured products, but not for most techniques

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Toe Scour Protection
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Excessive Launching of Stone
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Failure due to excessive toe scour
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Top Elevation of Protection?
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Wave and Vessel Forces
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Streambank Protection Basic Design Considerations

• Geomorphology
• Beginning ending points, and alignment
• Hydraulics
• Design Q
• Variations in stage and discharge
• Tractive force and secondary currents
• Toe Scour protection
• Top elevation of protection
• Waves and vessel forces
• Geotechnical Design
• Environmental considerations
• Toe Protection
• Surface Drainage
• Manufacturers recommendations
• Safety factors

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Consider Geotechnical Stability
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Streambank Protection Basic Design Considerations

• Geomorphology
• Beginning ending points, and alignment
• Hydraulics
• Design Q
• Variations in stage and discharge
• Tractive force and secondary currents
• Toe Scour protection
• Top elevation of protection
• Waves and vessel forces
• Geotechnical Design
• Environmental considerations
• Toe Protection
• Surface Drainage
• Manufacturers recommendations
• Safety factors

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Environmental Factors
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The Soft Touch Approach
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Too Soft?
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Streambank Protection Basic Design Considerations

• Geomorphology
• Beginning ending points, and alignment
• Hydraulics
• Design Q
• Variations in stage and discharge
• Tractive force and secondary currents
• Toe Scour protection
• Top elevation of protection
• Waves and vessel forces
• Geotechnical Design
• Environmental considerations
• Toe Protection
• Surface Drainage
• Manufacturers recommendations
• Safety factors

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Stone Launching
Longitudinal Peaked Stone
Longitudinal Stone Fill
Original height of stone maintained after stone
launches
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Streambank Protection Basic Design Considerations

• Geomorphology
• Beginning ending points, and alignment
• Hydraulics
• Design Q
• Variations in stage and discharge
• Tractive force and secondary currents
• Toe Scour protection
• Top elevation of protection
• Waves and vessel forces
• Geotechnical Design
• Environmental considerations
• Toe Protection
• Surface Drainage
• Manufacturers recommendations
• Safety factors

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Streambank Protection Basic Design Considerations

• Geomorphology
• Beginning ending points, and alignment
• Hydraulics
• Design Q
• Variations in stage and discharge
• Tractive force and secondary currents
• Toe Scour protection
• Top elevation of protection
• Waves and vessel forces
• Geotechnical Design
• Environmental considerations
• Toe Protection
• Surface Drainage
• Manufacturers recommendations
• Safety factors

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Manufactured Products
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Streambank Protection Basic Design Considerations

• Geomorphology
• Beginning ending points, and alignment
• Hydraulics
• Design Q
• Variations in stage and discharge
• Tractive force and secondary currents
• Toe Scour protection
• Top elevation of protection
• Waves and vessel forces
• Geotechnical Design
• Environmental considerations
• Toe Protection
• Surface Drainage
• Manufacturers recommendations
• Safety factors

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Factors That Influence the Safety Factor

• Designers experience (or lack thereof)
• With the protection technique being used
• With the stream itself
• Potential construction complications
• Sponsors capability
• To perform routine maintenance
• To perform emergency reinforcement
• Consequences of failure

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Streambank Protection Basic Design Considerations

• Geomorphology
• Beginning ending points, and alignment
• Hydraulics
• Design Q
• Variations in stage and discharge
• Tractive force and secondary currents
• Toe Scour protection
• Waves and vessel forces
• Geotechnical Design
• Environmental considerations
• Toe Protection
• Surface Drainage
• Manufacturers recommendations
• Safety factors

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Final Thoughts
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River Engineering is not Rocket Science
Its much more Complicated!