Water Stewardship Information Sources
| Citation | Ecofish Research Ltd. 2008. Assessment of adult fish passage at Dickson Falls during pulse flow releases from Elsie Lake Dam. Prepared for BC Hydro. |
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| Organization | BC Hydro |
| URL | https://www.bchydro.com/content/dam/hydro/medialib/internet/documents/environment/pdf/wup_assessment_of_adult_fish_passage_at_dickson_falls_du.pdf |
| Abstract/Description or Keywords | The Ash Water Use Plan includes the recommendation to release pulse flows to improve steelhead passage over Dickson Falls. This monitoring program is a directed research program that will determine whether pulse flows improve steelhead passage over Dickson Falls, and what magnitude and timing of release is most effective. This report provides the results of the third year of the 5 year monitoring program. During 2007 two pulses were released, one of 10 m3 /s (cms) magnitude between August 19 and 22, and another of 20 cms magnitude between September 23 and 25. Snorkel surveys to enumerate steelhead trout were conducted between August 18 and September 27 in four sections of the Ash River between Elsie Dam and the confluence of the Ash River with the Stamp River. Additional spot swims for were done at Dickson Falls (July 5 and 17) and Lanterman Falls (July 5) to confirm steelhead presence for steelhead tagging purposes. Observations of leap attempts at Dickson Falls were performed to compare passage attempts, success, and migration routes during the pulse flow release and non-release periods. For each of the two experimental pulse flow releases, four one hour observation events (07:00 to 08:00, 08:00 to 09:00, 12:00 to 13:00, and 13:00 to 14:00) were made during each of three periods. For the 10 cms release, these observations occurred during the pre-release control period, the ramp up, and the peak of the pulse. For the 20 cms release, these observations occurred during the pre-release control period, the ramp up, and the ramp down. |
| Information Type | report |
| Regional Watershed | Vancouver Island North |
| Sub-watershed if known | Ash River |
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| Project status | complete |
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