
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)