Groundwater Availability Modeling The Georgia Department of Natural Resources, Environmental Protection Division (EPD) is soliciting statements of qualifications and experience from qualified engineering firms who are interested in providing professional engineering services to conduct the following project: Groundwater Availability Modeling. Georgia EPD relies on several groundwater models to evaluate the prioritized aquifers of the Georgia Coastal Plain for Regional Water Planning purposes as well as managing the groundwater resources of the State by assessing potential impacts to nearby users as well as on the resource itself from proposed groundwater withdrawals. The main groundwater models used in these evaluations are as follows: The Jones-Torak model, The Jones-Torak model was developed for the lower Flint and Chattahoochee River basins in southwestern Georgia and adjacent parts of Florida and Alabama (part of the Apalachicola-Chattahoochee-Flint River Basin or ACF River Basin), using MODFLOW-2005, to evaluate the groundwater-flow budget in the lower ACF River Basin and to quantify the water exchanges between the Upper Floridan aquifer and the rivers. The active flow model area, which extends about 4,567 square miles in the lower ACF River Basin. The active flow model domain corresponds to areas where the Upper Floridan aquifer is at or near land surface and thus has a high level of hydraulic connection to surface water bodies. The model simulates groundwater flow within the Upper Floridan Aquifer and between the Upper Floridan aquifer and the overlying upper semi-confining unit and surficial aquifer. The model also simulates stream-aquifer and lake-aquifer flows and accounts for recharge and groundwater pumping for agricultural irrigation and municipal and industrial supply.
