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Culvert Design for Aquatic Organism Passage

Culvert Design for Aquatic Organism Passage. Three Points. Why fish/aquatic organism passage guidance? Fish Passage Synthesis Document Hydraulic Engineering Circular (HEC) 26. Why is guidance needed?. How do DOTs design & install culverts? Cost, stewardship and diminishing returns

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Culvert Design for Aquatic Organism Passage

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  1. Culvert Design for Aquatic Organism Passage

  2. Three Points • Why fish/aquatic organism passage guidance? • Fish Passage Synthesis Document • Hydraulic Engineering Circular (HEC) 26

  3. Why is guidance needed? • How do DOTs design & install culverts? • Cost, stewardship and diminishing returns • Straightforward, engineering-based guidance needed

  4. Clean Water Act

  5. Synthesis Report • Documented four categories • No impedance – span entire stream & floodplain • Geomorphic simulation – match natural channel conditions within culvert

  6. Geomorphic Simulation

  7. Synthesis Report • Documented four categories • No impedance – span entire stream & floodplain • Geomorphic simulation – match natural channel conditions within culvert • Bed stability – match hydraulic diversity via natural & oversize substrate • Hydraulic design – use of baffles & weirs

  8. Hydraulic Design

  9. Synthesis Report • Documented four categories • No impedance – span entire stream & floodplain • Geomorphic simulation – match natural channel conditions within culvert • Bed stability – match hydraulic diversity via natural & oversize substrate • Hydraulic design – use of baffles & weirs • Not a design manual • www.fhwa.dot.gov/engineering/hydraulics

  10. HEC-26 • Sponsored by Hydraulics, HEPN & HEPE • Comprehensive design manual • Scheduled for completion Spring 2009 • Challenges • Policy: Must comply with CWA • Engineering: Must keep simple enough to be useful to field while maintaining rigor

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