MODFLOW-2005 data sets for simulation of Groundwater-Flow Budget for the Lower Apalachicola-Chattahoochee-Flint River Basin in Southwestern Georgia and Parts of Florida and Alabama, 2008-12
Dates
Release Date
2017-01-01
Start Date
2008-01-01
End Date
2012-12-31
Publication Date
2023-09-15
Citation
Sepulveda, N. and Painter, J.A., 2017, MODFLOW-2005 data sets for simulation of Groundwater-Flow Budget for the Lower Apalachicola-Chattahoochee-Flint River Basin in Southwestern Georgia and Parts of Florida and Alabama, 2008-12: U.S. Geological Survey data release, https://doi.org/10.5066/F7DV1HCG.
Summary
As part of the National Water Census program in the Apalachicola-Chattahoochee-Flint (ACF) River Basin, the U.S. Geological Survey evaluated the groundwater budget of the lower ACF, with particular emphasis on recharge, characterizing the spatial and temporal relation between surface water and groundwater, and groundwater pumping. To evaluate the hydrologic budget of the lower ACF River Basin, a groundwater-flow model, constructed using MODFLOW-2005, was developed for the Upper Floridan aquifer and overlying semiconfining unit for 2008–12. Model input included temporally and spatially variable specified recharge, estimated using a preliminary version of a Precipitation-Runoff Modeling System (PRMS) model for the ACF River Basin, and [...]
Summary
As part of the National Water Census program in the Apalachicola-Chattahoochee-Flint (ACF) River Basin, the U.S. Geological Survey evaluated the groundwater budget of the lower ACF, with particular emphasis on recharge, characterizing the spatial and temporal relation between surface water and groundwater, and groundwater pumping. To evaluate the hydrologic budget of the lower ACF River Basin, a groundwater-flow model, constructed using MODFLOW-2005, was developed for the Upper Floridan aquifer and overlying semiconfining unit for 2008–12. Model input included temporally and spatially variable specified recharge, estimated using a preliminary version of a Precipitation-Runoff Modeling System (PRMS) model for the ACF River Basin, and pumping, partly estimated on the basis of measured agricultural pumping rates in Georgia. The model was calibrated to measured groundwater levels, and base flows which were estimated using hydrograph separation. The simulated groundwater flow budget resulted in a net cumulative loss in groundwater storage during the study period. Spatial variability in simulated hydrologic budgets for eight subbasins was attributed to such factors as soil storage capacity, Lake Seminole impoundment, and the presence of in-channel springs. The model simulated a net storage loss for all the subbasins. The model is limited by its conceptualization, the data used to represent and calibrate the model, and the mathematical representation of the system; therefore, any interpretations should be considered in light of these limitations. In spite of these limitations, the model provides insight regarding water availability in the lower ACF River Basin. This USGS data release contains all of the input and output files for the simulations described in the associated model documentation report (https://doi.org/10.3133/sir20175141).
The purpose of this report is to evaluate the components of the groundwater budget of the lower ACF River Basin for 2008–12. Particular emphasis was placed on characterizing the spatial and temporal relation between perennial streams, intermittent streams, and wetland discharges and changes in groundwater storage, and recharge and groundwater pumping. This evaluation incorporated a process-based estimation of recharge and groundwater pumping distribution based on data from agricultural metering, field reconnaissance, crop distribution, and spatial analysis. Information gained on groundwater discharge to streams can be used to inform a more accurate accounting of streamflow throughout the ACF River Basin (LaFontaine and others, 2017). The evaluation presented in this report is one element of an overall evaluation of freshwater availability in the ACF River Basin. The development of the model input and output files included in this data release are documented in U.S. Geological Survey Scientific Investigations Report 2017-5141 (https://doi.org/10.3133/sir20175141).
Preview Image
Image of the model domain and active area of the model.