Geophysical Infrastructure Study: Jim Woodruff Lock and Dam Completed
A study site of the Geophysical Infrastructure Studies: Earthen Dams and Abandoned Mine Lands project.
Jim Woodruff Lock and Dam, Lake Seminole, Sneads, Florida
Jim Woodruff Lock and Dam is located on the Apalachicola River just south of the confluence of the Flint and Chattahoochee Rivers along the Georgia – Florida border. Construction was completed in 1954 and impounds Lake Seminole. The dam has a long history of excessive seepage along the right abutment and below the fixed crest spillway. Several karst features have been mapped over the years including sinkholes, both on land and along the lake bottom, and disappearing and reappearing streams. Such features were excavated and grouted during construction. Despite years of investigation of the dam foundation, there remains uncertainty on the flow paths of water below the fixed crest spillway and adjacent right abutment. Seepage appearing in Polk Lake only accounts for about half of the water being discharged into the Apalachicola River at the “river boil”. The goal of this survey is to use complementary geophysical methods to determine if we can image karst features and potential groundwater pathways.
The geophysical methods selected were electrical resistivity tomography (ERT), electromagnetic induction (EMI), self-potential (SP), and ground penetrating radar (GPR). The field campaign was completed in March 2018.
Return to main project page | Geology, Geophysics, and Geochemistry Science Center
A study site of the Geophysical Infrastructure Studies: Earthen Dams and Abandoned Mine Lands project.
Jim Woodruff Lock and Dam, Lake Seminole, Sneads, Florida
Jim Woodruff Lock and Dam is located on the Apalachicola River just south of the confluence of the Flint and Chattahoochee Rivers along the Georgia – Florida border. Construction was completed in 1954 and impounds Lake Seminole. The dam has a long history of excessive seepage along the right abutment and below the fixed crest spillway. Several karst features have been mapped over the years including sinkholes, both on land and along the lake bottom, and disappearing and reappearing streams. Such features were excavated and grouted during construction. Despite years of investigation of the dam foundation, there remains uncertainty on the flow paths of water below the fixed crest spillway and adjacent right abutment. Seepage appearing in Polk Lake only accounts for about half of the water being discharged into the Apalachicola River at the “river boil”. The goal of this survey is to use complementary geophysical methods to determine if we can image karst features and potential groundwater pathways.
The geophysical methods selected were electrical resistivity tomography (ERT), electromagnetic induction (EMI), self-potential (SP), and ground penetrating radar (GPR). The field campaign was completed in March 2018.
Return to main project page | Geology, Geophysics, and Geochemistry Science Center