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HYDROLOGICAL MODELS, BMPs, AND TMDL DEVELOPMENT
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Pp. 185-190 in Total Maximum Daily Load (TMDL) Environmental Regulations: Proceedings of the March 11-13, 2002 Conference, (Fort Worth, Texas, USA) 701P0102.(doi:10.13031/2013.7554)
Authors: T.Day, M.Sasser, J.Logan, M.Mullen, and F. Walker
Keywords: TMDL, BASINS, BMP, modeling, water quality
The University of Tennessee, in collaboration with the Tennessee Department of
Agriculture and the Tennessee Department of Environment and Conservation (TDEC), is
evaluating the validity of the hydrological model Better Assessment Science Integrating point
and Nonpoint Sources (BASINS).
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BASINS/GIS integrates a geographic information system (GIS), national watershed data,
and state-of-the-art environmental assessment and modeling tools into one package. Simulations
of pollutant loading and transport with the BASINS model can be useful in developing Total
Maximum Daily Loads or TMDLs, and determining where best management practices (BMP)
would be most effective. Two East Tennessee watersheds were selected for this study: Pond
Creek in Loudon County and Crooked Fork-Emory in Morgan County. The primary streams
running through both watersheds are listed as only partially supporting their designated use
according to the Tennessee 303d list of impaired waterways prepared by TDEC. Dairy and beef
pasture systems are the predominant agricultural activities in Pond Creek. Crooked Fork-Emory
has a mixed (forestry and urban) land use.
During 2001, water quality in the streams was monitored. Analysis was performed on
monthly grab samples for nutrients (nitrogen and phosphorus), sediments and pathogens. Field
data including flow rate, water temperature, air temperature, dissolved oxygen, pH and
conductivity was recorded at eight sampling sites. The data obtained from these will be used to
determine the appropriate data inputs needed by the BASINS model to predict pollutant loading
in east Tennessee watersheds and to compare the effectiveness of different BMPs in reducing
the nutrient and pathogen loading in these watersheds.