Simulated effects of impoundment of lake seminole on ground-water flow in the upper Floridan Aquifer in southwestern Georgia and adjacent parts of Alabama and Florida

Geohydrology of the lower Apalachicola-Chattahoochee-Flint River basin, southwestern Georgia, northwestern Florida, and southeastern Alabama

“…Geologic nomenclature used herein is consistent with previous hydrologic investigations performed in the study area and described in reports by Allen (1984), Miller (1986), Torak and McDowell (1996), Torak and others (1996), Albertson and Torak (2002), Mosner (2002), Jones and Torak (2004), and Torak and others (2006). Although other investigators have proposed different names for the geologic units described herein, use of an alternate geologic nomenclature would deter from the purpose of this report, which supports the first objective stated previously, namely, to increase current understanding of the hydrogeologic framework that controls stream-aquifer relations and flow-system processes.…”

“…Mosner (2002) described stream-aquifer relations and ground-water-level conditions in the lower ACF River Basin during the drought years of 1999 and 2000, and computed aquifer contribution to streamflow for specific reaches. Jones and Torak (2004) described the geohydrology of the area surrounding Lake Seminole in southwestern Georgia, and simulated the effects of impoundment on ground-water flow in the Upper Floridan aquifer. Torak and others (2006) cited physical and hydrochemical evidence of hydraulic connection between surface water and ground water beneath and around Lake Seminole and Jim Woodruff Lock and Dam, and documented the complex exchange of surface water and ground water between the lake, streams, and aquifer.…”

Evaluation of water‐use policies for baseflow recovery during droughts in an agricultural intensive karst watershed: Case study of the lower Apalachicola–Chattahoochee–Flint River Basin, southeastern United States

“…The MODFE approximates the following two‐dimensional partial differential equation of groundwater flow in the UFA, subject to appropriate boundary and initial conditions that represent flow through porous media (Jones & Torak, ): where t is time, ( x , y ) are the cartesian coordinate directions, H ( x , y , t ) is the hydraulic head of the USCU, h ( x , y , t ) is the aquifer hydraulic head, R ( x , y , t ) is the vertical hydraulic conductance (vertical hydraulic conductivity divided by thickness) of USCU, W ( x , y , t ) is the unit areal recharge or discharge rate (infiltration), P ( x , y , t ) is point source or sink, S ( x , y , t ) is the storage coefficient, and symmetric transmissivity is written in matrix form as …”

“…The MODFE model (Cooley, 1992;Torak, 1993aTorak, , 1993b The MODFE approximates the following two-dimensional partial differential equation of groundwater flow in the UFA, subject to appropriate boundary and initial conditions that represent flow through porous media (Jones & Torak, 2004): (Jones & Torak, 2006) 1983; Zienkiewicz, 1977) for the approximation of the governing equation, boundary, and initial conditions. More information about initial and boundary conditions can be found in Jones and Torak (2006) and MODFE manuals (Cooley, 1992;Torak, 1993aTorak, , 1993b).…”

Ground-water and surface-water flow and estimated water budget for Lake Seminole, southwestern Georgia and northwestern Florida

“…After impoundment, backwater conditions upstream of Jim Woodruff Lock and Dam reduced the hydraulic gradient from the aquifer toward the stream along the Chattahoochee and Flint Rivers for 47 mi, and to a lesser extent for the other two newly formed impoundment arms. The reduced gradient under impoundment conditions produced a corresponding reduced ground-water flow toward each impoundment arm (Jones and Torak, 2003). (Mosner, 2002) and (B ) July 1962 (Sever, 1965).…”