Underwater Installation of Filter Systems for Scour and Erosion Countermeasures, Volume 1: Research Report (2018) / Chapter Skim
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Pages 149-153
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From page 149... ...
A.1 Survey of Practice: National Cooperative Highway Research Project 24-42: "Underwater Installation of Filter Systems for Scour and Other Erosion Control Countermeasures" Introduction: Current technical guidance on scour and erosion control countermeasure design includes recommendations for either a granular or geotextile filter beneath the countermeasure. However, there is little guidance on actual installation techniques for placing the filter under water when temporary dewatering of the site cannot be performed.
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From page 150... ...
A.2 PLEASE ANSWER THE FOLLOWING QUESTIONS USING THE RESPONSE THAT BEST REPRESENTS TYPICAL PRACTICES OF YOUR AGENCY: PART A - FILTER DESIGN: The following set of questions is related to filter design practices typically used by your agency for bridge scour protection and other erosion control projects: 4. Does your agency require filters beneath the armor layer where the countermeasure must be placed under water?
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From page 151... ...
A.3 o Bridge pier scour o Vertical walls or bulkheads o Other (please describe)
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From page 152... ...
A.4 o Dive crew placing and temporarily pinning or weighting the geotextile (e.g., with sandbags) prior to placement of the armor system o Floating the geotextile on the water surface and subsequently sinking it with weights o Dumping sand-filled geocontainers (geobags)
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From page 153... ...
A.5 o Construction access o Constructability issues o Environmental concerns/permitting o Lack of knowledge of importance of filter by construction personnel o Other (please describe)
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