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dc.contributor.authorGolladay, Stephen W.en_US
dc.contributor.authorHicks, David W.en_US
dc.date.accessioned2013-07-23T15:23:55Z
dc.date.available2013-07-23T15:23:55Z
dc.date.issued2013-04
dc.identifier.urihttp://hdl.handle.net/1853/48531
dc.descriptionProceedings of the 2013 Georgia Water Resources Conference, April 10-11, 2013, Athens, Georgia.en_US
dc.description.abstractThe occurrence of three substantial climatic and hydrologic droughts since 1998 has raised concerns about water supply and stream flow throughout Georgia. This concern is acute in the Flint River Basin where low flows of unusual duration and magnitude were observed. The Flint River is essentially unregulated, originating just south of Atlanta and joining the Chattahoochee River to form Lake Seminole in southwestern Georgia. In addition to being an important water supply, the Flint River is noted for its biological and habitat diversity. For our analyses we used long term daily flow records from four stations (USGS: 02344478 – Griffin, 02347500 – Carsonville, 0234750 – Montezuma, 02353000 – Newton) to examine potential changes in hydrologic characteristics. We compared the period of 1940-1974 to 1975-2010, with the later period representing extensive development and population growth in the upper basin, and expansion of irrigated agriculture in the lower basin. Trends in rainfall were compared over the same intervals. No long term changes in annual rainfall were observed. Cycles of above and below average rainfall were observed as were periodic multi-year droughts. Annual water yields (annual CFS/watershed area at the station) ranged from 1.0 to 1.6 CFS/mi2 at all stations during most years. A declining tendency was observed at each station during the 1975-2010 interval, but was only significant at the Montezuma Station (p = 0.04). Winter yields showed similar declines only being significantly lower at the Griffin Station (p = 0.05). Summer yields were lower at all sites and significant declines were observed at Griffin, Carsonville, and Newton (p < 0.05). Calculation of 32 hydrologic indicators showed that the frequencies of low June-September median monthly flows, 1-day, 3-day, 7-day, and 30-day low flows were more common in the 1975-2010 interval at all stations. Our results indicate that human water use is causing increased severity and duration of low flows during the spring and summer seasons throughout the Flint River. These tendencies are pronounced during seasonal and extended droughts. Increased demand is the result of population expansion in the upper basin and irrigation expansion in the lower basin. Current rates of water use are likely unsustainable and pose a significant threat to stream health and the unique biological diversity characteristic of the Flint River.en_US
dc.description.sponsorshipSponsored by: Georgia Environmental Protection Division; U.S. Department of Agriculture, Natural Resources Conservation Service; Georgia Institute of Technology, Georgia Water Resources Institute; The University of Georgia, Water Resources Faculty.en_US
dc.description.statementofresponsibilityThis book was published by Warnell School of Forestry and Natural Resources, The University of Georgia, Athens, Georgia 30602-2152. The views and statements advanced in this publication are solely those of the authors and do not represent official views or policies of The University of Georgia, the Georgia Water Research Institute as authorized by the Water Research Institutes Authorization Act of 1990 (P.L. 101-307) or the other conference sponsors.en_US
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.relation.ispartofseriesGWRI2013. Ecological: Function, Restoration, Monitoringen_US
dc.subjectWater resources managementen_US
dc.subjectExtended droughten_US
dc.subjectLong term hydrologic changeen_US
dc.subjectFlint Riveren_US
dc.subjectWater supplyen_US
dc.subjectStream flowen_US
dc.subjectIncreased water useen_US
dc.titleIndicators of Long Term Hydrologic Change in the Flint Riveren_US
dc.typeProceedingsen_US
dc.contributor.corporatenameJoseph W. Jones Ecological Research Centeren_US
dc.embargo.termsnullen_US


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