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The Savoy Experimental Watershed (SEW) is a University of Arkansas property of approximately 1,250 hectares (ha) in northwestern Arkansas. The SEW occurs on a mantled (regolith-covered) karst and is the site of an integrated research effort between the University of Arkansas, Arkansas Department of Environmental Quality, Agricultural Research Service of the U.S. Department of Agriculture, and the U.S. Geological Survey. As part of the integrated research effort, a long-term, interdisciplinary field laboratory will be developed for the in-situ quantitative determination of processes, controls, and hydrologic and nutrient-flux budgets in surface-water, soil-water, and shallow ground-water environments in response to specific, near-surface confined animal operation (CAFO) activities and land uses. Comprehensive research at SEW encompasses the detailed aspects of flow and solute budgets (1) from precipitation, (2) from near-surface anthropogenic activities, (3) in runoff, (4) from within the soil zone, (5) at the epikarst, (6) from within identifiable components of the shallow karst aquifer, and (7) at spring resurgences. This presentation is limited to selected elements of budget terms (5), (6), and (7), with the objective of relating areal, stratigraphic, and temporal variations in water quality to identifiable CAFO activities and to ground-water processes and controls. Current CAFO activities in basin 1 at SEW have focused on cattle and poultry.
Continuous hydrologic monitoring at SEW includes measuring precipitation in 0.01-inch increments, and measuring interflow, epikarst flow, streamflow, water levels in selected wells, spring discharge, and appropriate water-quality parameters, all at 15-minute increments with automated probes and samplers. Discrete samples of groundwater from the previously mentioned sources are also collected throughout selected storm hydrographs (at about 1-hour increments) for analyses of water-quality constituents not easily measured by existing sensors. These data provide a wealth of information that allows mass-balance calculations, boundary-flux determinations, and water-quality evolution, all within a well-constrained areal and temporal framework amenable to numerical simulation at a site-specific scale.
Understanding gained at SEW has been applied to studies of CAFO sites elsewhere in the mantled-karst areas of the southern Ozarks, and has been used to guide data-collection rationale. Preliminary conclusions of interest are:
University of Arkansas, 118 Ozark Hall, Fayetteville, AR 72701 (firstname.lastname@example.org)
2National Soil Tilth Laboratory, 2150 Pammel Drive, Ames, IA 50011-4420 (email@example.com)
3U.S. Geological Survey, 401 Hardin Road, Little Rock AR 72211-3528 (firstname.lastname@example.org)
4Arkansas Department of Environmental Quality, 8001 National Drive, Little Rock, AR 72209
5University of Arkansas, Fayetteville, AR 72701 (email@example.com)
6U.S. Geological Survey and University of Arkansas, Fayetteville, Arkansas (firstname.lastname@example.org)
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