Proceedings - Teaching and Learning Centre - Simon Fraser ...

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Fraser River Action Plan 3rd Research Workshop Water Quality Conditions in an Urban Watershed K. Hall Civil Engineering and Westwater Research Centre University of British Columbia The Brunette River watershed is one of the most highly urbanized watersheds in the Lower Fraser Valley. The major transportation corridor in the valley passes through the watershed and with the exponential population growth, land use changes have resulted in more impervious surface areas that prevent the adsorption of contaminants by soil and vegetation. This results in the transport of contaminants to the waterways in stormwater runoff. Dry weather monitoring shows high levels of fecal coliforms in several creeks, especially Still Creek where domestic wastewaters are entering the upper reaches. This severely restricts the recreational use of many of these areas. Low dissolved oxygen levels in lower Still Creek and the Brunette River, just below the dam at the outlet of Burnaby Lake, can cause fish mortality or restrict fish movement in these reaches in summer. Stormwater runoff contains high levels of many contaminants such as trace metals, nutrients and suspended solids. Contaminant transport is closely coupled to the intensity of the rainfall event and the transport of suspended solids since many of the contaminants are readily adsorbed to this particulate material. The quality of the runoff from streets is related to the level of vehicular traffic in the area. Monitoring of contaminants over the period of a year along with flow measurements will allow the calculation of contaminant loading from stormwater runoff. A source control program integrated with best management practices will be necessary to regulate this source of non-point pollution and prevent further degradation of this urban watershed. Page 133
Fraser River Action Plan 3rd Research Workshop Non-Point Source Contamination and Ecosystem Health Case Study of the Brunette River Watershed Objective To determine the relationship between land use and the generation of chemical contaminants, the transport of these contaminants in urban stormwater runoff, and the impacts of these contaminants on the aquatic environment. Measuring the Health of Aquatic Ecosystems 1) Comparing of contaminant levels to guidelines & criteria 2) Contaminant levels in organisms 3) Bioassays 4) Community structure, organism abundance 5) Other: - enzyme, hormone levels - visual & histological pathologies - ecosystem processes Page 134
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PROCEEDINGS 3rd RESEARCH WORKSHOP F
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TABLE OF CONTENTS Participants ....
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Development of a Citizen’s Monito
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Fraser River Action Plan 3rd Resear
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SESSION 1 PULP MILL EFFLUENT ISSUES
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SESSION 5 BIOLOGICAL INDICATORS
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SESSION 6 ESTUARY ISSUES
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Fraser River Action Plan The Use of
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Fraser River Action Plan Concluding
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