Analysis of Nutrient and Ancillary Water-Quality Data for Surface and GroundWater of the Willamette Basin, Oregon, 1980-90

摘要

The purposes of this report are to (1) to describe the spatial and temporaldistributions of nutrient (Nitrogen and phosphorus) concentrations and water-quality indicators (temperature, specific conductance, pH, dissolved oxygen concentration, and suspended sediment concentration) in surface and ground water of the Willamette and Sandy River Basins and (2) to present preliminary conceptual models to explain these distributions. To the extent possible, constituent concentrations are compared to water-quality standards established by the State of Oregon or by the U.S. Environmental Protection Agency (USEPA), and to concentrations that are associated with adverse biological effects. The review period is October 1, 1979 through September 30, 1990, that is, water years 1980-90.