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Sources of Nutrient Input in an Urbanizing Oregon Watershed

EPA Grant Number: U915530
Title: Sources of Nutrient Input in an Urbanizing Oregon Watershed
Investigators: Sonoda, Kazuhiro
Institution: Portland State University
EPA Project Officer: McClure, Karen
Project Period: August 1, 1999 through August 1, 2002
Project Amount: $92,611
RFA: STAR Graduate Fellowships (1999)
Research Category: Academic Fellowships , Fellowship - Ecology and Ecosystems , Ecological Indicators/Assessment/Restoration

Description:

Objective:

The objective of this research is to identify sources and mechanisms of nutrient (phosphorus and nitrogen) transport within the urbanizing watershed by quantifying nutrient contributions of urban infrastructures to stream water quality.

Approach:

To understand phosphorus (P) dynamics within the urbanizing watershed, a small urbanized sub-watershed within the Johnson Creek basin was selected. A mass balance of P within this watershed will be developed. Hydrologic parameters, including storm drain discharges, precipitation, groundwater seepage, soil water and runoff contribution to dry wells, will be monitored and sampled for P concentrations during storm events and the dry season. Oxygen isotopes ratio (18/16) will be examined to quantify contributions of precipitation, soil water, and groundwater to the stream.

Expected Results:

This comprehensive study should provide a complete picture of hydrological passage and associated P concentrations within this urbanized watershed, and the results of this study will enhance our knowledge of urbanization effects on stream water quality.

Supplemental Keywords:

phosphorus, nitrogen, nutrient, urban hydrology, rural hydrology, landuse, drywell, storm drain, runoff, Geographic Information System, non-point source pollution, watershed/management, water quality. , Water, Geographic Area, Scientific Discipline, Nutrients, Hydrology, Environmental Chemistry, Ecology and Ecosystems, State, phosphorus, runoff, aquatic ecosystem, fate and transport, river inputs, groundwater, storm water, Oregon, nutrient concentrations, nitrogen, nutrient transport, OR, nutrient cycling, stream water quality, stream ecosystem

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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