Hydrologic Criteria: NPS Water Quality Assessmentby Thomas V. Dupuis, CH2M, United States,
Nancy U. Schultz, CH2M, United States,
Document Type: Proceeding Paper
Part of: Legal, Institutional, Financial and Environmental Aspects of Water Issues
This paper summarizes the authors deliberations and findings regarding selection of hydrologic conditions suitable for the evaluation of the water quality impacts of nonpoint sources (NPSs) of pollutants. Many of the evaluations discussed in this paper were performed while developing recommendations appropriate to assessing the impacts of Boston area combined sewer overflows. This paper advocates continuous precipitation/runoff methods to assess the frequency, duration and severity of runoff pollutant loadings and use of receiving water hydrologic criteria logically based on the joint probability of occurrence with storms.
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