Concurrent Sessions D: Design and Performance of Roughened Channels - Challenges of Standardizing Design Criteria for Roughened Channels for Fish Passage
Location
Oregon State University
Start Date
27-6-2013 4:10 PM
End Date
27-6-2013 4:30 PM
Description
This presentation examines the feasibility and potential challenges associated with assembling and publishing standardized criteria for the design of roughened channels for the passage of fish and other aquatic organisms. The roughened channel concept has been applied to culvert replacements and retrofits, diversion dam replacements and retrofits, channel design for stream restoration and simulation, and grade control at barrier removals. Retrofit of culverts and diversions, and other projects where site conditions impose significant changes to the natural flow regime and pattern, typically pose the greatest risk of fish passage failure. Widely-accepted standardized criteria for the design of roughened channels for fish passage over a broad range of site conditions have not been developed and published. Preparation and promulgation of such criteria would yield numerous benefits in the design, performance, and evaluation of roughened channel fish passage projects. Benefits include: (a) prioritization of project goals, (b) raised awareness of risks, (c) a framework for improved designs based on relevant principles of hydraulic engineering and biology, (d) a structure for project proposal and design evaluation by project funders, the natural resource agencies, and the permitting agencies, and (e) increased likelihood the project will meet the objectives. The presentation will summarize the results of interviews with experts in the field of roughened channel design and evaluation; a literature review; and case studies.
Concurrent Sessions D: Design and Performance of Roughened Channels - Challenges of Standardizing Design Criteria for Roughened Channels for Fish Passage
Oregon State University
This presentation examines the feasibility and potential challenges associated with assembling and publishing standardized criteria for the design of roughened channels for the passage of fish and other aquatic organisms. The roughened channel concept has been applied to culvert replacements and retrofits, diversion dam replacements and retrofits, channel design for stream restoration and simulation, and grade control at barrier removals. Retrofit of culverts and diversions, and other projects where site conditions impose significant changes to the natural flow regime and pattern, typically pose the greatest risk of fish passage failure. Widely-accepted standardized criteria for the design of roughened channels for fish passage over a broad range of site conditions have not been developed and published. Preparation and promulgation of such criteria would yield numerous benefits in the design, performance, and evaluation of roughened channel fish passage projects. Benefits include: (a) prioritization of project goals, (b) raised awareness of risks, (c) a framework for improved designs based on relevant principles of hydraulic engineering and biology, (d) a structure for project proposal and design evaluation by project funders, the natural resource agencies, and the permitting agencies, and (e) increased likelihood the project will meet the objectives. The presentation will summarize the results of interviews with experts in the field of roughened channel design and evaluation; a literature review; and case studies.