Professional Paper 1656-C
Prepared in cooperation with the
Suwannee River Water Management District
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Purpose and Scope
Description of Study Areas
Lower Suwannee and Lower Santa Fe Rivers
Channel and Floodplain Characteristics
Smaller Rivers and Streams
Ground-Water Flow System Boundaries
Upper and Lower Flow-Sysem Boundaries
Patterns of Ground-Water Levels and Flow
Sources and Sinks of Water
Evaluation of Ground-Water and Surface-Water Exchanges Using Hydrologic Data
Evaluation of Ground-Water and Surface-Water Exchanges Using a Hydrologic Model
Ground-Water Flow Model
Surface-Water Flow Model
Exchanges of water between the Upper Floridan aquifer and the Lower Suwannee River were evaluated using historic and current hydrologic data from the Lower Suwannee River Basin and adjacent areas that contribute ground-water flow to the lowest 76 miles of the Suwannee River and the lowest 28 miles of the Santa Fe River. These and other data were also used to develop a computer model that simulated the movement of water in the aquifer and river, and surface- and ground-water exchanges between these systems over a range of hydrologic conditions and a set of hypothetical water-use scenarios.
Long-term data indicate that at least 15 percent of the average annual flow in the Suwannee River near Wilcox (at river mile 36) is derived from ground-water discharge to the Lower Suwannee and Lower Santa Fe Rivers. Model simulations of ground-water flow to this reach during water years 1998 and 1999 were similar to these model-independent estimates and indicated that ground-water discharge accounted for about 12 percent of the flow in the Lower Suwannee River during this time period.
The simulated average ground-water discharge to the Lower Suwannee River downstream from the mouth of the Santa Fe River was about 2,000 cubic feet per second during water years 1998 and 1999. Simulated monthly average ground-water discharge rates to this reach ranged from about 1,500 to 3,200 cubic feet per second. These temporal variations in ground-water discharge were associated with climatic phenomena, including periods of strong influence by El Niņo-associated flooding, and La Niņa-associated drought. These variations showed a relatively consistent pattern in which the lowest rates of ground-water inflow occurred during periods of peak flood levels (when river levels rose faster than ground-water levels) and after periods of extended droughts (when ground-water storage was depleted). Conversely, the highest rates of ground-water inflow typically occurred during periods of receding levels that followed peak river levels.
Grubbs, J.W., and Crandall, C.A., 2007, Exchanges of Water between the Upper Floridan Aquifer and the Lower Suwannee and Lower Santa Fe Rivers, Florida: U.S. Geological Survey Professional Paper 1656-C, 83 p.
U.S. Department of the Interior
U.S. Geological Survey
Florida Integrated Science Center
2010 Levy Avenue
Tallahassee, FL 32310
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