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: Packard, Benjamin H
Project Period: August 1, 1999 through August 1, 2002
Project Amount: $92,611
RFA: STAR Graduate Fellowships (1999) RFA Text |  Recipients Lists
Research Category: Academic Fellowships , Ecological Indicators/Assessment/Restoration , Fellowship - Ecology and Ecosystems


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.


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., Scientific Discipline, Geographic Area, Water, Hydrology, Nutrients, Environmental Chemistry, State, Ecology and Ecosystems, fate and transport, nutrient transport, aquatic ecosystem, Oregon, nutrient concentrations, runoff, river inputs, nutrient flux, phosphorus, nutrient cycling, stream water quality, groundwater, nitrogen, OR, storm water

Progress and Final Reports:

  • 2000
  • 2001
  • Final