Click on “Download PDF” for the PDF version or on the title for the HTML version.
If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.
PAPILLION CREEK WATERSHED FECAL COLIFORM MODELING
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Pp. 234-241 in Total Maximum Daily Load (TMDL) Environmental Regulations–II Proceedings of the 8-12 November 2003 Conference (Albuquerque, New Mexico USA), Publication Date 8 November 2003. .(doi:10.13031/2013.15566)
Authors: M.G. Lindburg, M.W. Powell, L.R. Christensen
Keywords: Fecal coliform, bacteria contamination, water quality modeling, agriculture, WASP, watershed impairment
The Papillion Creek Watershed (Watershed) consists of 402 square miles of drainage area with
urban and rural land uses that spans three counties in eastern Nebraska. Numerous stream and
reservoir impairments exist within the Watershed that impact primary contact recreation,
aesthetics, fisheries, and overall water quality. Water quality modeling of fecal coliform (FC)
bacteria was conducted to determine the extent of FC pollution and to determine recommended
Best Management Practices (BMPs) that would control concentrations of FC bacteria. Statistical
and dynamic water quality modeling were used in this effort.
(Download PDF) (Export to EndNotes)
The City of Omaha maintains a large network of water quality sampling sites within the
Watershed. For each site, a standard set of statistical correlations were made for FC dependencies
on flow, precipitation, and turbidity, which provided clues as to the pollution sources. FC mass
loading probability curves were also developed that compared the maximum permissible levels
of FC to values actually measured.
Fate and transport modeling for FC bacteria concentrations within the mainstem stream segments
was accomplished using non-proprietary WASP software. FC loadings were indexed to the
various land uses within the Watershed. Basic hydraulic parameters for both 2002 baseline and
future growth conditions were used to develop the bacterial fate and transport mechanisms.
Technical findings from water quality modeling for FC bacteria to date suggest:
• FC bacteria levels are highly dependent on runoff events and sediment transport
• FC levels are well above surface water quality standards for “summer season” primary
• Urbanized areas contribute another order of magnitude above non-urban contributions of
FC bacteria under median conditions.
• It is possible that background FC levels from wildlife alone may be higher than standards
• Comprehensive BMPs will be required to control sediment, bacteria, and nutrients.
• Regulatory compliance for FC will be difficult.