{"product_id":"otrec-rr-11-19","title":"OTREC-RR-11-19","description":"\u003cp\u003eStreambeds 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. ÒRoughened channelsÓ 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.\u003c\/p\u003e","brand":"David Sillars","offers":[{"title":"Paperback","offer_id":44310477734049,"sku":"9781111128180","price":23.73,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0462\/1120\/3233\/files\/1k82wjee-front-shortedge-384_8f7f1e92-bee1-454b-8f9e-f7851adb8bf4.jpg?v=1748404343","url":"https:\/\/bookswholesale.myshopify.com\/products\/otrec-rr-11-19","provider":"BooksWholesale","version":"1.0","type":"link"}