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An analysis of water quality data in Tualatin River tributaries with three different land uses

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  • Water quality and stream flow data for tliree representative land uses in the Tualatin River Basin were evaluated to determine the comparative levels of various pollutants. In addition, the data were used in an effort to identify the extent to which observed concentrations of total and ortho phosphorus could be attributed to nonpoint surface runoff, to groundwater inflow or to extraction from previously deposited phosphorus bearing sediment. Surface runoff was not identified as a factor in determining water quality at any of the weekly dry season samplings in the streams flowing through agricultural and forested areas. Five incidents were identified in the urban area in which surface runoff was contributing to the quality of water in the streams. The data which were collected between May 1 and October 31 confirm that during this period surface runoff has minimal impact on stream quality. The data, however, do not distinguish between the possibilities of groundwater inflow or re-suspension of previously deposited sediments as being the major contributor to elevated phosphorus concentrations.
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