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Geohydrology and Effects of Climate and Pumpage Change on Water Resources of the Aucilla–Suwannee–Ochlockonee River Basin, South-Central Georgia and Adjacent Areas of Florida

Progress and Significant Results, 2006—2007

  • Measured ground-water levels at about 350 wells, and stream stage and discharge at 83 stations during September 19–29, 2006.
  • Mapped potentiometric-surface and stream influence on Upper Floridan and surficial aquifers, September 2006.
  • Evaluated and compiled existing hydrologic, geologic, climate, and pumpage information.
  • Data collection and compilation thus far indicate
    • Complex geologic structure and variations in hydraulic properties create diverse patterns of ground-water flow and recharge in the Upper Floridan aquifer and govern the hydraulic connection and water exchange between the Upper Floridan and surficial aquifers and surface water. Low water-transmitting properties of the Gulf Trough–Apalachicola Embayment limit regional flow and recharge to the aquifer in the Trough–Embayment region.
    • Infiltration of precipitation and surface water in the karst region along the Florida–Georgia State line provides recharge to the Upper Floridan aquifer in the ASO River Basin located to the south and east of the Gulf Trough.
    • Comparison of historical potentiometric surfaces since the late-1960s indicates changes in ground-water-flow directions across the boundary between ASO and ACF River Basins that coincide with increased agricultural-irrigation pumpage and drought.
    • Ground-water hydrographs indicate basinwide response to variations in climate and pumpage despite little hydraulic connection of the Upper Floridan aquifer to land surface and surface water in areas of the Gulf Trough and Okefenokee Swamp.

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