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Analysis of pollution control strategies for the Tualatin River Public Deposited

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  • In response to Oregon House Bill 3338, the Oregon Department of Environmental Quality requested proposals in 1991 to assemble available information on Tualatin River Basin conditions to provide a scientific basis for improving river water quality. An interdisciplinary team of researchers from Oregon State University and Portland State University was asked in December, 1991 to perform the work. Over the next 24 months, the team undertook several tasks to assemble the best information to aid decision-makers in choosing actions to meet federally mandated standards and improve overall basin water quality. The major tasks included: 1. description of the aquatic health of the river basin 2. definition of the phosphorus/algae problem in the river 3. formulation of alternative strategies to improve water quality 4. development of models to simulate and evaluate the alternative strategies 5. evaluation of the probable environmental and economic effects of alternative strategies Background papers and reports prepared for this project are available from the Oregon Water Resources Research Institute at Oregon State University. The primary objective of the project was to identify and recommend the most cost effective strategies to attain the permissible total maximum daily load (TMDL) of phosphorus, which causes the Tualatin River's algae problems. But the evaluation also considered other river health goals expressed by the public during the project. Examples included the concern for river aesthetics and fish and wildlife populations. Though the models were not capable of formally evaluating these other river basin attributes, the effects were qualitatively assessed where relevant.
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