Skip to main content

Examining the Relationship Between Wet Weather and Fecal Contamination in a North Carolina Estuary

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

The Newport River Estuary (NPRE) was recently included on the United States Environmental Protection Agency's 303(d) list of impaired waters for fecal coliforms. Therefore, the estuary is the focus of current total maximum daily load (TMDL) development and implementation. The NPRE is a coastal estuary in eastern North Carolina, and is vital for the local economy in regards to commercial shellfish harvesting and recreational activities (fishing, shrimping, boating, swimming). There is a delicate balance in maintaining the water quality for the NPRE's beneficial uses, and protecting environmental integrity, given the growing coastal population and increasing development along the banks of the NPRE. The increasing levels of development and anthropogenic influence is exacerbating stormwater runoff problems, which is contributing to heightened levels of fecal coliforms and subsequent shellfish harvesting area closures. To assist with the NPRE TMDL development, fecal indicator bacteria (FIB, E. coli and Enterococcus sp. ) and environmental parameter measurements (including but not limited to rainfall, temperature, salinity, and turbidity) were taken from September 2004 to August 2006 over relevant spatial, temporal, and event-driven scales throughout the estuary. Selected water samples from rain and non-rain events were further characterized beyond the traditional FIB analyses using Bacteroides spp. molecular analyses to determine whether fecal contamination signals were either predominantly human or non-human. The results from this study demonstrated a significant correlation between rainfall and FIB after 3.00 cm (1.2 inches) of rainfall over 48 hours and a mixed signal from our preliminary molecular marker analyses. In addition, further analyses indicate that the current management strategy of closing the shellfish harvesting areas after 3.81 cm of rain (1.5 inches) within 24 hours may not be as protective of public health as desired. Accurate models to determine the causal relationship between environmental variables and FIB levels are a major goal of this TMDL project. Thus, the results from this research are being utilized to parameterize both space/time and Bayesian (probabilistic) models of FIB distribution. The goal of these modeling efforts is to provide tools to predict loading of microbial contaminants to shellfish harvesting areas, as well as to provide information on fate and transport of FIB and potential pathogens of concern in the NPRE.

Keywords: ESTUARINE; FECAL INDICATOR BACTERIA; RAINFALL; SHELLFISH; SPACE/TIME MAPPING

Document Type: Research Article

DOI: https://doi.org/10.2175/193864707786619855

Publication date: 2007-10-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more