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Report: District of Lake Country Source to Tap Assessment of Okanagan Lake Intake July 2010 00078OKAN
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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 objectives of this assessment of the DLC Okanagan Lake Intake were to characterize the lake and its immediate watershed, identify current and forecast future drinking water hazards and vulnerabilities, characterize the risk posed by each hazard and provide recommendations to reduce potential impacts on the intake.
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Author: Larratt Aquatic Consulting
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Date Published: Jul 2010
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Report ID: 20321
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Audience: Government and Public
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This assessment characterized natural and man-induced hazards to drinking water quality as physical, chemical or biological. Fortunately, Okanagan Lake is one of the most studied lakes in BC, making background information available to this assessment.
Existing research was augmented by field studies of water currents near the intake and lab studies on the fall rates of particulate contaminants. This research was used to define a proposed Intake Protection Zone (IPZ), based on a two hour travel time of water
currents to the intake. The hazard assessments were then divided into those occurring inside the IPZ and those occurring outside the IPZ. The same hazard occurring outside the IPZ was given a lower risk rating than that hazard presented within the IPZ where
there is less dilution and less time to react to a contaminant.
Specific recommendations and action plans were developed: (1) source protection for mid-North Basin Okanagan Lake (2) water treatment and system protection plan and (3) future large expenditure improvements to the DLC Okanagan Lake water system. Key recommendations include: applying for a License of Occupation over the Intake Protection Zone; having DLC Planning staff and Water System staff work closely with the Lakestone developers to relocate the Lakestone Marina and the storm water outfall or otherwise mitigate the aquatic impacts of the project; modifying the water quality monitoring to comply with IHA filtration deferral; and consider extending the intake.
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Report Type
Subject
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Region - Okanagan |
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Watershed Groups - 310 - Okanagan |
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Water Information - Water Management |
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Water Information - Water Quality |
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Water Information - Watershed Assessment Studies |
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