A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Allison Creek Dam Removal and Stream Restoration near Valdez Alaska
Abstract only available. Allison Creek flows from Allison lake adjacent to the Valdez Marine Terminal near Valdez, Alaska. It is an anadromous fish stream flowing into Port Valdez. A 40′ wide in‐stream concrete dam was installed in 1976 in association with a raw water intake structure in the stream bed. By 2003, the bed elevation downstream of the dam had lowered sufficiently that the dam was undermined and the stream breached under the dam. This project involved removal of the concrete dam and restoration of the stream through the site to provide unimpeded fish passage and protect the water intake system. The channel was re‐constructed as a step‐pool channel system to distribute a drop of approximately 11 feet over a distance of 280 lf. The design was based on the morphology of a stable reference reach adjacent to the project site. Design and construction was tailored to accommodate the close proximity of several utilities in the stream bed, including four water intake pipes, a 48″ diameter buried crude oil pipeline, and a buried fiber optic cable. In addition to restoring the stream channel, the floodplain was reconstructed and the site re‐vegetated. This project has been highly successful in restoring the stream bed to a stable morphology while re‐establishing fish passage and accommodating the location of multiple buried utilities.
Allison Creek Dam Removal and Stream Restoration near Valdez Alaska
Abstract only available. Allison Creek flows from Allison lake adjacent to the Valdez Marine Terminal near Valdez, Alaska. It is an anadromous fish stream flowing into Port Valdez. A 40′ wide in‐stream concrete dam was installed in 1976 in association with a raw water intake structure in the stream bed. By 2003, the bed elevation downstream of the dam had lowered sufficiently that the dam was undermined and the stream breached under the dam. This project involved removal of the concrete dam and restoration of the stream through the site to provide unimpeded fish passage and protect the water intake system. The channel was re‐constructed as a step‐pool channel system to distribute a drop of approximately 11 feet over a distance of 280 lf. The design was based on the morphology of a stable reference reach adjacent to the project site. Design and construction was tailored to accommodate the close proximity of several utilities in the stream bed, including four water intake pipes, a 48″ diameter buried crude oil pipeline, and a buried fiber optic cable. In addition to restoring the stream channel, the floodplain was reconstructed and the site re‐vegetated. This project has been highly successful in restoring the stream bed to a stable morphology while re‐establishing fish passage and accommodating the location of multiple buried utilities.
Allison Creek Dam Removal and Stream Restoration near Valdez Alaska
Roach, Christopher H. (author) / Shoulder, MacNamara C. (author)
World Water and Environmental Resources Congress 2005 ; 2005 ; Anchorage, Alaska, USA
2005-05-15
1 pages
Conference paper
Electronic Resource
English
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