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OTREC-RR-11-19

OTREC-RR-11-19

ByDavid Sillars

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Streambeds provide for the necessary habitats and spawning cycles of a healthy fish population. Oregon law requires underwater hydraulic structures to provide proper fish passage. Increasingly stringent regulations apply to fish passageways, and designers must consider a range of flows to accommodate fish movement and avoid structural failure. Fish passages, culverts or bridges, are built where roads cross streambeds. “Roughened channels” technique re-creates streambeds with the hydraulics necessary for adequate fish passage. This report examines long-term success factors for implementation of fish passageways, especially in the construction phase, and examines whether failures are due to inadequate range and mix of material gradation; unexpected water velocity; or inadequate mixing or compaction of materials during construction. Other factors may include the relationship of downstream slope to structure slope, well-graded fine soil materials in channel fill, and frequent site visits.

Details

Publication Date
Jul 13, 2011
Language
English
Category
Engineering
Copyright
All Rights Reserved - Standard Copyright License
Contributors
By (author): David Sillars

Specifications

Pages
124
Binding Type
Paperback Perfect Bound
Interior Color
Black & White
Dimensions
US Letter (8.5 x 11 in / 216 x 279 mm)

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