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This report summarizes the existing information on previous investigations examining the sediment source issue, including the implications of sediment on incubation success for Cowichan River salmonids, and to develop a list of sites with their priority and rationale for implementing rehabilitative measures. The area under consideration is restricted to the Cowichan River mainstem and bounded primarily between the Cowichan Lake weir and Skutz Falls.
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Author: Gaboury, M.; LGL Limited environmental research associates, Silvestri, S.; BC Conservation Foundation and O'Brien, J.; Trow Associates Inc.
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Date Published: May 2008
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Report ID: 23906
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Audience: Government and Public
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The impact of fine sediments on salmonid egg incubation habitat in the Cowichan River is an ongoing concern among members of the Cowichan Stewardship Roundtable. High inputs of fine sediments, typically from excessive bank erosion, may infiltrate the interstices of the riverbed spawning gravel and reduce egg-to-fry survivals. Although sediment inputs from naturally eroding banks are apparent along the mainstem, several sites stand out as having larger areas of fine sediments and which are or have the potential to be significant sources of fine sediments to the river. For example, Stoltz Bluff has been identified as the most significant single source of fine sediments to the river (LGL and KWL 2005; KWL 2005).
Rehabilitation measures were constructed at Stoltz Bluff in 2006 to stabilize the toe of the Bluff thereby reducing sediment inputs from this chronic erosion site. Significant erosion sites have also been identified further upstream above Skutz Falls but an evaluation on the composition of these eroding banks, the mechanism of bank failure, the relative rate of bank erosion, and the feasibility of constructing rehabilitative works to stabilize the sites and reduce the erosion rate has not been considered in detail.
The purpose of this report is to summarize the existing information on previous investigations examining the sediment source issue, including the implications of sediment on incubation success for Cowichan River salmonids, and to develop a list of sites with their priority and rationale for implementing rehabilitative measures. For this project, the area under consideration is restricted to the Cowichan River mainstem and bounded primarily between the Cowichan Lake weir and Skutz Falls.
This project was co-funded by Living Rivers-Georgia Basin/Vancouver Island (2006-11), a program of the BC Living Rivers Trust Fund.
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Report Type
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Fish and Aquatic Habitat Information |
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Subject
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Fish Species - Brown Trout - Salmo trutta |
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Fish Species - Chinook Salmon - Oncorhynchus tshawytscha |
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Fish Species - Chum Salmon - Oncorhynchus keta |
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Fish Species - Coastal Cutthroat Trout - O. clarki clarki |
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Fish Species - Coho Salmon - Oncorhynchus kisutch |
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Fish Species - Cutthroat Trout (General) - Oncorhynchus clarki |
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Fish Species - Dolly Varden Char - Salvelinus malma |
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Fish Species - Rainbow Trout - Oncorhynchus mykiss |
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Fish Species - Steelhead - Oncorhynchus mykiss |
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Region - Vancouver Island |
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Fish and Fish Habitat - Habitat and Stream Assessment |
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Fish and Fish Habitat - Impact Assessment |
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Fish and Fish Habitat - Research |
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Fish and Fish Habitat - Restoration |
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Watershed Groups - 920 - Vancouver Island (East) Rivers |
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Water Information - Channel Morphology |
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Water Information - Hydrometric / Hydrology |
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Water Information - Restoration |
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Water Information - Water Quality |
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