Nutrient enrichment in wadeable urban streams in the piedmont ecoregion of the southeastern United States

Heliyon
By: , and 

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Abstract

The U.S. Geological Survey (USGS) Southeastern Stream Quality Assessment (SESQA) collected weekly samples for nitrogen and phosphorus in 76 wadeable streams in the urbanized Piedmont ecoregion of the Southeastern United States, during April–June 2014. Total nitrogen (TN) concentrations in excess of EPA guidelines and statistically greater than at reference locations indicated nitrogen-nutrient enrichment in streams draining poultry confined animal feeding operations (CAFO) or urban centers. Nitrate plus nitrite (NO3 + NO2) dominated TN species in urban/CAFO-influenced streams. Streams that drained poultry CAFO and Washington DC had statistically higher NO3 + NO2 concentrations than streams draining Atlanta, Charlotte, Greenville, or Raleigh. In contrast, total phosphorus (TP) concentrations in Atlanta and Washington DC streams statistically were comparable to and lower than, respectively, reference stream concentrations. Over 50% of TP concentrations in Greenville, Charlotte, Raleigh and CAFO-influenced streams exceeded the EPA guideline and reference location mean concentrations, indicating phosphorus-nutrient enrichment. Urban land use, permitted point sources, and soil infiltration metrics best predicted TN exceedances. Elevated TN and NO3 + NO2 concentrations in urban streams during low flow were consistent with reduced in-stream dilution of point-source or groundwater contributions. Urban land use, permitted point sources, and surface runoff metrics best predicted TP exceedances. Elevated TP in CAFO and urban streams during high flow were consistent with non-point sources and particulate transport.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Nutrient enrichment in wadeable urban streams in the piedmont ecoregion of the southeastern United States
Series title Heliyon
DOI 10.1016/j.heliyon.2018.e00904
Volume 4
Issue 11
Year Published 2018
Language English
Publisher Elsevier
Contributing office(s) South Atlantic Water Science Center
Description Article No. e00904; 24 p.
First page 1
Last page 24
Country United States
Other Geospatial Piedmont Ecoregion