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Microbial and Nutrient Concentration and Load Data During
Stormwater Runoff at a Swine Concentrated Animal Feeding
Operation in the North Carolina Coastal Plain, 2006–2007

Open-File Report 2008-1156
By Stephen L. Harden

Abstract

This report summarizes water-quality and hydrologic data collected during 2006–2007 to characterize bacteria and nutrient loads associated with overland runoff and subsurface tile drainage in spray fields at a swine concentrated animal feeding operation. Four monitoring locations were established at the Lizzie Research Site in the North Carolina Coastal Plain Physiographic Province for collecting discharge and waterquality data during stormwater-runoff events. Water stage was measured continuously at each monitoring location. A stage-discharge relation was developed for each site and was used to compute instantaneous discharge values for collected samples. Water-quality samples were collected for five storm events during 2006–2007 for analysis of nutrients and fecal indicator bacteria. Instantaneous loads of nitrite plus nitrate, total coliform, Escherichia coli (E. coli), and enterococci were computed for selected times during the five storm events.

Harden, S.L., 2008, Microbial and nutrient concentration and load data during stormwater runoff at a swine
concentrated animal feeding operation in the North Carolina Coastal Plain, 2006–2007: U.S. Geological
Survey Open-File Report 2008–1156, 22 p. (only online at http://pubs.water.usgs.gov/ofr2008-1156/)