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

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Fraser River Action Plan 3rd Research Workshop Nitrogen and Phosphorus in the Upper Fraser River in Relation to Point- and Diffuse-Source Loadings P.A. Chambers and T.D. French National Hydrology Research Institute Water quality studies on the Fraser River have focused largely on contaminants and their effect on fisheries and primary production, particularly in the reach between the town of Hope and the estuary. By comparison, few studies have addressed water quality issues in the upper reaches of the Fraser River. The objective of this study was to evaluate trends in nitrogen (N) and phosphorus (P) chemistry in the Fraser River from the headwaters to Hope. Anthropogenic nutrient loading to the Fraser River upstream of Hope was found to be highly regionalized with loading being minimal to the reach extending from the headwaters to Hansard, greatest between Hansard and Marguerite (16x10 4 m 3 /d from indirect pulp mill discharge; 1x10 4 m 3 /d from direct and 2.5x10 4 m 3 /d from indirect sewage discharge). Total P export increased from an average of 7 tonnes/yr near the headwaters (Red Pass) to 10,337 tonnes/yr at Hope, with 85% of the TP export at Hope occurring during the high flow season and only 15% during low flows. N export also increased from an average of 113 tonnes/yr near the headwaters to 13,217 tonnes/yr at Hope. Anthropogenic sources contributed 13% (11% from pulp mills and 2% from municipalities) and 5% (4% from pulp mills and 1% from municipalities) of the total P load at Marguerite during low and high flow seasons, respectively. The anthropogenic contribution to total P export at Hope was 12% and 3% over the same flow regime, whereas anthropogenic contributions were negligible upstream of Prince George. Conclusions While anthropogenic sources contribute only a small fraction of the nutrient load in the upper Fraser River (
Fraser River Action Plan 3rd Research Workshop AIM • To evaluate trends in nutrient chemistry in the Fraser River from its headwaters to the town of Hope. WHY? • Most water quality studies on the Fraser River have focused on contaminants and fisheries aspects, particularly for the lower Fraser. • Improvements in pulp mill technology have reduced BOD and toxicity concerns, however nutrients are still a major issue. Page 106
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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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