Water Stewardship Information Sources
| ID | 277 |
|---|---|
| Citation | Burge, LM. 2009. Analysis of Sedimentation and Sediment Mitigation Strategies for Mission Creek. Prepared for City of Kelowna |
| Organization | City of Kelowna |
| URL | http://a100.gov.bc.ca/pub/acat/public/viewReport.do?reportId=16013 |
| Abstract/Description or Keywords | This report investigates the spatial and temporal patterns of sediment deposition in Mission Creek. An analysis of the frequency and intensity of large flows that transport the sediment was conducted. An analysis of the long profile and grain size pattern from the exit from Ghallaghars Canyon to Okanagan Lake is presented. An analysis of 18 reaches in Mission Creek was conducted. These reaches were grouped into natural, channelized, sedimentation, and downstream sections for interpretation. Mission Creek displayed a braided or wandering channel pattern on a 1938 orthophoto. Therefore, each reach was assessed to determine if it had the same energy and grain size characteristics as a braided or meandering river channel. The restoration plan presented by Gaboury and Slaney (2003) and Gaboury et al. (2004) is reviewed in light of the new analyses. Recommendations are presented in the final section. Sedimentation downstream of KLO Bridge has been a significant problem since at least 1967. Since 1990, sediment has been extracted from Mission Creek downstream of KLO Bridge three times (1990, 1997, and 2006). The average time between sediment extractions to maintain channel capacity during this period is every 8 years. Since 1937, large flow events have occurred every 6.4 years on average, with recent large flows occurring in 1986, 1990, 1997, and 2006. The analysis contained in this report yielded a number of recommendations for the mitigation of sedimentation and the restoration of Mission Creek. The setting back of dykes to form a floodplain within the new dyke location to improve the geomorphic and ecological functioning of the river is sound. Land should be purchased where possible to allow for the setback of the dykes. restoration, aquatic habitat, sediment, erosion, flood, fisheries |
| Information Type | report |
| Regional Watershed | Okanagan |
| Sub-watershed if known | Mission Creek |
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| Project status | complete |
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