USGS Scientific Investigations Report 2013–5103  - Application of the SPARROW Model to Assess Surface-Water Nutrient Conditions and Sources in the United States Pacific Northwest

Scientific Investigations Report 2013–5103 

Application of the SPARROW Model to Assess Surface-Water Nutrient Conditions and Sources in the United States Pacific Northwest

Figure 4. Results for the Willamette River, Oregon, from the total nitrogen National Hydrography Dataset SPARROW model developed for the United States Pacific Northwest (2002 conditions). Urban sources include developed land, discharge from wastewater-treatment facilities, and leaching from septic tanks; livestock manure is generated by confined and grazing livestock.

First posted July 17, 2013

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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