Organizational Unit:
Georgia Water Resources Institute

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Now showing 1 - 10 of 1767
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    Survival and regrowth of fecal enterococci in desiccated and rewetted sediments
    (Georgia Institute of Technology, 2005-04) Hartel, Peter G. ; Rodgers, Karen ; Fisher, Jared A. ; McDonald, Jennifer L. ; Gentit, Lisa C. ; Otero, Ernesto ; Rivera-Torres, Yaritza ; Bryant, Tamara L. ; Jones, Stephen H. ; University of Georgia. Dept. of Crop and Soil Sciences ; University of Georgia. Marine Extension Service ; University of Puerto Rico (Mayagüez Campus). Dept. of Marine Sciences ; University of New Hampshire. Jackson Estuarine Laboratory ; Hatcher, Kathryn J.
    Fecal enterococci are bacteria widely used as indicators of fecal contamination in marine and estuarine waters. One assumption is that these bacteria do not persist or regrow in the environment. Our continuing problems with high numbers of fecal enterococci in sediment suggested that these bacteria may persist and regrow. Therefore, we conducted experiments with fecal enterococci to determine their ability to survive desiccation and to regrow in marine and estuarine sediments from Georgia, New Hampshire, and Puerto Rico after 0, 2, 30, and 60 days. Although numbers of fecal enterococci generally decreased with increased length of drying, many fecal enterococci survived desiccation and regrew in rewetted sediment, violating the assumption that fecal bacteria not persist or regrow in the environment. Because there is not a better alternative to fecal enterococci as fecal indicator bacteria, these results suggest that care should be taken not to disturb the sediment when sampling water for fecal contamination, or if the sediment is already disturbed (e.g., on windy days or during runoff conditions), then the influence of sediment should be considered.
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    Effects of Seasonal Variation on Runoff Curve Number for Selected Watersheds of Georgia - Preliminary Study
    (Georgia Institute of Technology, 2007-03) Tedela, Negussie H. ; McCutcheon, Steven C. ; Rasmussen, Todd C. ; University of Georgia
    This study examined seasonal effects on the runoff Curve Number for five forested watersheds in Georgia. The periods between April-October and November-March were defined as the growing and dormant seasons, respectively. Annual maximum peak runoff data were used to select one pair of rainfall and runoff volumes for each water year. The Curve Number method was used to determine Curve Numbers using these observed precipitation and runoff values. Based on the date that rainfall and runoff volume were observed, the Curve Number values were grouped to their respective seasons for statistical analysis. The results from all watersheds showed higher mean Curve Numbers for the dormant season compared to the growing season. However, statistically significant differences between mean Curve Number values for the growing and dormant season were detected for only two of the five watersheds. Depending on the availability of data, selecting two or three representative months for each season would likely result in a better prediction by avoiding transition periods between the two seasons.
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    Design of a Mine Dewatering System Which Minimizes Consumptive Use of a Major Groundwater Resource
    (Georgia Institute of Technology, 1993-04) Bentley, Samuel J. ; Fay, William M. ; Exploration Resources, Inc. ; Hatcher, Kathryn J.
    Competing demands on water resources are a natural consequence of population and industrial growth. Care must be taken, when utilizing groundwater resources, to minimize the adverse impacts on adjacent groundwater production wells. This paper describes one mining company's successful effort to reduce its groundwater withdrawal, yet increase the effectiveness of its mine dewatering system.
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    Invertebrates Associated with Coarse Woody Debris in Streams, Upland Forests, and Wetlands: A Review
    (Georgia Institute of Technology, 1999-03) Braccia, Amy ; Batzer, Darold P. ; University of Georgia. Dept. of Entomology ; Hatcher, Kathryn J.
    We reviewed literature on the invertebrate groups associated with coarse woody debris in forests, streams, and wetlands, and contrasted patterns of invertebrate community development and wood decomposition among these ecosystems.
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    The Program of the Georgia Water Research Institute
    (Georgia Institute of Technology, 1989-05) Kahn, Bernd ; Georgia Institute of Technology. Environmental Resources Center ; Hatcher, Kathryn J.
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    Growth readiness for Georgia: water quality matters
    (Georgia Institute of Technology, 2005-04) Hartmann, Randy ; Haden, Joel ; Georgia. Dept. of Community Affairs. Office of Environmental Management ; Tennessee Valley Authority ; Hatcher, Kathryn J.
    Georgia communities will soon benefit from a new program for planners, public works, and local elected officials. The program helps communities learn how land use decisions affect water quality, and then make informed choices about managing growth. It helps them comply with regulatory requirements. The program's target audience, planners, public works, and local elected officials, are intimately involved in the day-to-day, nuts-and-bolts of their community's land use and water quality decisions. Through the program, they will receive training, presentations, maps, references and technical assistance. The program helps them explain simply and succinctly the complex issues and choices surrounding land use and water quality in their community. It helps them build consensus for development rule changes that permit communities to both grow and preserve their precious and vital water resources. The session will describe plans for this program in Georgia, and how a similar program is producing results for planners and public works officials in Tennessee.
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    National hydrography dataset (NHD) conversion to arc hydro: lessons learned
    (Georgia Institute of Technology, 2003-04) Bales, E. Scott ; McRae, Eric ; Georgia. Dept. of Natural Resources ; University of Georgia ; Hatcher, Kathryn J.
    The University of Georgia will complete the National Hydrography Dataset for the State of Georgia by the end of the 2003 calendar year. The next stage in the maturation of Georgia’s water resources database is the conversion to Arc Hydro – An ArcGIS data model for water resources. This geodatabase based capability enables a behavioral approach to data modeling that enables a paradigm maturation beyond the comprehensive integration needed for a hydrologic information system to potentially enabling real-time modeling in the GIS context. The full capabilities of Arc Hydro are being realized using ArcGIS 8.3 with geodatabase dynamic segmentation functions necessary for stream networking. This implementation of Arc Hydro represents the foundation for the eventual construction of a comprehensive, integrated, real-time, environmental modeling capability for the State of Georgia.
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    Mitigation for Reservoir Projects Part I: Wildlife Mitigation Past and Present
    (Georgia Institute of Technology, 1989-05) Burns, Carol J. ; Conger, Allen W. ; Whiteside, Richard W. ; Law Environmental, Inc. ; Hatcher, Kathryn J.
    The environmental impacts of water development projects have recently become the source of considerable concern by various groups. A dichotomy has evolved in which there exists a continuing need to satisfy population water demands and a recognition that projects to accomplish these ends may cause irreversible adverse impacts (Hagan and Roberts 1973). Mitigation for the loss of wetland habitat has been a major issue to resource managers and developers for only the past 15 years. In the interim, substantial progress has occurred in the evolution and acceptance of the concept; we are now at a time when we have enough knowledge and experience to review how effectively the concept has been implemented (LaRoe 1986). For the portion of Georgia north of the Fall Line, a network of public fishing and water supply reservoirs was proposed to ensure future water supplies. A need for 31 reservoirs was identified (Cowie and Cooley 1988). What avoidance, restoration/ creation criteria and techniques should those proposing to impact wetland tracts apply for reservoir mitigation in each instance? The scope of this paper is to present the evolution of the wetland mitigation concept with respect to reservoir development. A review of case histories and evaluation of our progress is presented with a specific emphasis on mitigation for wildlife.
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    Development of a Plan for Fish Tissue Monitoring and Issuance of Fish Consumption Advisories
    (Georgia Institute of Technology, 1993-04) Manning, R. O. ; Georgia. Environmental Protection Division ; Hatcher, Kathryn J.
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    Water conservation in Georgia: who’s doing what and where do we go from here?
    (Georgia Institute of Technology, 2003-04) Elfner, Mary A. ; Georgia. Dept. of Natural Resources ; Hatcher, Kathryn J.
    The purpose of this paper is to show that, regarding water conservation, there is quite a lot happening in Georgia. Coordination of all of these efforts is needed, which is the main objective of the newly formed Department of Natural Resources (DNR) Water Conservation Program. This paper discusses not only water conservation planning at a statewide level, but also some of the many educational and measurable results programs taking place at this time by all water use sectors: residential, business and commercial, institutional, industrial and agricultural. Recommendations for future action are also given. A list of web sites is given for those wishing to conduct more extensive research into this topic.