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Report: EFFECTIVENESS MONITORING OF STOLTZ BLUFF STABILIZATION WORKS, COWICHAN RIVER-Final Report
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If you have any questions on the information presented, or require additional report data or attachments, please contact the Report Contact
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The impact of fine sediments on salmonid egg incubation habitat in the Cowichan River has
been an ongoing concern among members of the Cowichan Stewardship Roundtable. The
concern relates to the impact of fine sediments, typically generated from excessive bank
erosion, infiltrating the interstices of the riverbed spawning gravel and reducing egg-to-fry
survival
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Author: Marc Gaboury, Dave Robichaud, LGL Limited
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Date Published: Jun 2012
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Report ID: 41251
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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 has
been an ongoing concern among members of the Cowichan Stewardship Roundtable. The
concern relates to the impact of fine sediments, typically generated from excessive bank
erosion, infiltrating the interstices of the riverbed spawning gravel and reducing egg-to-fry
survival. Although sediment inputs from naturally eroding banks are apparent along the
mainstem, several sites stand out as generating large volumes 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). The sediment contribution from
Stoltz Bluff was estimated at ~10,000-28,000 m3 annually between 1993 and 2004.
Suspended sediment from Stoltz Bluff also represented from 35-45% of the total suspended
load measured at Vimy Road, ~15 km further downstream. To address this significant
sediment source, 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.
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Report Type
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Fish and Aquatic Habitat Information |
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Subject
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Region - Vancouver Island |
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Fish and Fish Habitat - Enhancement Assessment |
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