An existing three-dimensional model (MODFLOW-2000) by Petkewich and Campbell (2007) was updated to simulate potential changes in groundwater flow and groundwater-level conditions caused by injecting reclaimed water into the Middendorf aquifer in Mount Pleasant, South Carolina. The model was recalibrated to conditions from 1900 to 2008. Simulations included a Base Case and two injection scenarios. Maximum pumping rates were simulated as 6.65, 8.50, and 10.5 million gallons per day for the Base Case, Scenario 1, and Scenario 2, respectively. The Base Case simulation represents a non-injection estimate of the year 2050 groundwater levels for comparison purposes for the two injection scenarios. For Scenarios 1 and 2, the simulated injection of reclaimed water at 3 million gallons per day begins in 2012 and continues through 2050. The flow paths and time of travel for the injected reclaimed water were simulated using particle-tracking analysis. This USGS data release contains all of the input and output files for the simulations described in the associated model documentation report (https://pubs.usgs.gov/sir/2009/5185/). With this data release compilation, a small number of errors were found and corrected with the published model. River elevations were modified in 45 cells and elevations were modified in 15 Constant-Head Boundary cells. This data release also includes MODFLOW-2000 source code.

An existing three-dimensional model (MODFLOW-2000) by Fine, Petkewich, and Campbell (2017) (https://doi.org/10.3133/sir20175128) was used to evaluate 7 water-management scenarios and predict the effects on the groundwater flow and groundwater-level conditions in the Mount Pleasant, South Carolina area. This model was originally developed in 2007, by Petkewich and Campbell (https://pubs.er.usgs.gov/publication/sir20075126), then updated and recalibrated to conditions from 1900 to 2015. Results of six previous scenario simulations (scenarios 1-6) for the Mount Pleasant Water Works are published in a U.S. Geological Survey (USGS) Scientific Investigations Report (https://doi.org/10.3133/sir20175128). The archived model input and output files are available in a USGS data release (https://doi.org/10.5066/F7S181FC). Seven additional MODFLOW-2000 scenarios (numbered 7-13), using this updated and recalibrated model, were developed to evaluate different withdrawal strategies which are included in this data release: (7) Mount Pleasant Waterworks bringing online a new well (located at the old well 5 location) at 3.51 million gallons per day (Mgal/d) in 2025; (8) Maximizing withdrawals from Mount Pleasant Waterworks wells 2 and 5 (3.51 Mgal/d each) in 2020 and 2025, respectively; (9) Same as Scenario 7, but removing well 3 from production in 2025; (10) Same as Scenario 9, but removing well 4 from production in 2025 (11) Same as Scenario 7, but converting well 3 to an injection well in 2025 (12) Same as Scenario 11, but converting well 4 to an injection well in 2030; and (13) Same as scenario 8, but with two injection wells added (one in 2025 and one in 2035) to Mount Pleasant Waterworks well field. Nine alternate simulations for scenarios 11-13 (three MODFLOW and six MODPATH) were done to evaluate the effects of different porosity on the groundwater flow system, water levels, and the time-of-travel of particles from injection wells to the main water source. This USGS data release contains all the input and output files for the simulations described above and in the readme.txt file of this data release (https://doi.org/10.5066/P9GZEE4E).

An existing three-dimensional model (MODFLOW-2000) by Fine, Petkewich, and Campbell (2017) (https://doi.org/10.3133/sir20175128) was used to evaluate 7 water-management scenarios and predict the effects on the groundwater flow and groundwater-level conditions in the Mount Pleasant, South Carolina area. This model was originally developed in 2007, by Petkewich and Campbell (https://pubs.er.usgs.gov/publication/sir20075126), then updated and recalibrated to conditions from 1900 to 2015. Results of six previous scenario simulations (scenarios 1-6) for the Mount Pleasant Water Works are published in a U.S. Geological Survey (USGS) Scientific Investigations Report (https://doi.org/10.3133/sir20175128). The archived model input and output files are available in a USGS data release (https://doi.org/10.5066/F7S181FC). Seven additional MODFLOW-2000 scenarios (numbered 7-13), using this updated and recalibrated model, were developed to evaluate different withdrawal strategies which are included in this data release: (7) Mount Pleasant Waterworks bringing online a new well (located at the old well 5 location) at 3.51 million gallons per day (Mgal/d) in 2025; (8) Maximizing withdrawals from Mount Pleasant Waterworks wells 2 and 5 (3.51 Mgal/d each) in 2020 and 2025, respectively; (9) Same as Scenario 7, but removing well 3 from production in 2025; (10) Same as Scenario 9, but removing well 4 from production in 2025 (11) Same as Scenario 7, but converting well 3 to an injection well in 2025 (12) Same as Scenario 11, but converting well 4 to an injection well in 2030; and (13) Same as scenario 8, but with two injection wells added (one in 2025 and one in 2035) to Mount Pleasant Waterworks well field. Nine alternate simulations for scenarios 11-13 (three MODFLOW and six MODPATH) were done to evaluate the effects of different porosity on the groundwater flow system, water levels, and the time-of-travel of particles from injection wells to the main water source. This USGS data release contains all the input and output files for the simulations described above and in the readme.txt file of this data release (https://doi.org/10.5066/P9GZEE4E).

An existing three-dimensional model (MODFLOW-2000) by Petkewich and Campbell (2007) (https://pubs.usgs.gov/sir/2007/5126/) was updated to simulate six predictive water-management scenarios that were created to simulate potential changes in groundwater flow and groundwater-level conditions in the Mount Pleasant, South Carolina area. The model was recalibrated to conditions from 1900 to 2015. Simulations included six scenarios: (1) maximize Mount Pleasant Waterworks reverse-osmosis plant capacity by increasing groundwater withdrawals from 3.9 million gallons per day (Mgal/d) in 2015 to 8.6 Mgal/d from the Middendorf aquifer; (2) same as Scenario 1, but with the addition of a 0.5 Mgal/d supply well in the Middendorf aquifer near Moncks Corner, SC; (3) same as Scenario 1, but with the addition of a 1.5 Mgal/d supply well in the Middendorf aquifer near Moncks Corner, SC; (4) maximize Mount Pleasant Waterworks well capacity by increasing withdrawals from the Middendorf aquifer from 3.9 Mgal/d in 2015 to 10.2 Mgal/d (5) minimizing Mount Pleasant Waterworks surface-water purchase from the Charleston Water System by adding supply wells and increasing withdrawals from the Middendorf aquifer from 3.9 Mgal/d in 2015 to 12.2 Mgal/d; and (6) same as Scenario 1, but with the addition of quarterly model stress periods to simulate seasonal variations in the groundwater withdrawals. 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/sir20175128).

An existing three-dimensional model (MODFLOW-2000) by Petkewich and Campbell (2007) (https://pubs.usgs.gov/sir/2007/5126/) was updated to simulate six predictive water-management scenarios that were created to simulate potential changes in groundwater flow and groundwater-level conditions in the Mount Pleasant, South Carolina area. The model was recalibrated to conditions from 1900 to 2015. Simulations included six scenarios: (1) maximize Mount Pleasant Waterworks reverse-osmosis plant capacity by increasing groundwater withdrawals from 3.9 million gallons per day (Mgal/d) in 2015 to 8.6 Mgal/d from the Middendorf aquifer; (2) same as Scenario 1, but with the addition of a 0.5 Mgal/d supply well in the Middendorf aquifer near Moncks Corner, SC; (3) same as Scenario 1, but with the addition of a 1.5 Mgal/d supply well in the Middendorf aquifer near Moncks Corner, SC; (4) maximize Mount Pleasant Waterworks well capacity by increasing withdrawals from the Middendorf aquifer from 3.9 Mgal/d in 2015 to 10.2 Mgal/d (5) minimizing Mount Pleasant Waterworks surface-water purchase from the Charleston Water System by adding supply wells and increasing withdrawals from the Middendorf aquifer from 3.9 Mgal/d in 2015 to 12.2 Mgal/d; and (6) same as Scenario 1, but with the addition of quarterly model stress periods to simulate seasonal variations in the groundwater withdrawals. 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/sir20175128).

The U.S. Geological Survey in cooperation with Mount Pleasant Water Works updated an existing three-dimensional model (MODFLOW-2000) by Fine, Petkewich, and Campbell (2017) (https://doi.org/10.3133/sir20175128) to evaluate two water-management scenarios and predict the effects of increased pumpage on the groundwater flow and groundwater-level conditions in the Mount Pleasant, South Carolina area. This model was originally developed in 2007, by Petkewich and Campbell (https://pubs.er.usgs.gov/publication/sir20075126), then updated and recalibrated to conditions from 1900 to 2015. The updated model was used to simulate six scenario simulations (scenarios 1-6) for the Mount Pleasant Water Works which are published in a U.S. Geological Survey (USGS) Scientific Investigations Report (https://doi.org/10.3133/sir20175128). The associated model input and output files are available in a USGS data release (https://doi.org/10.5066/F7S181FC). In 2018, using the updated and recalibrated model from 2017, seven additional MODFLOW-2000 scenarios (numbered 7-13), were developed to evaluate additional withdrawal strategies. The archived model input and output files for those scenarios are available in a USGS data release (https://doi.org/10.5066/P9GZEE4E). For these scenarios future groundwater withdrawals for Mount Pleasant Water Works were modified while maintaining 2015 pumping rates for all other pumping wells. The model simulates from 1900-2015 with the addition of 2016-2500 for the predictive scenarios. This data release present the model data sets for 2 additional scenarios. The 2017 model, by Fine and others, was slightly updated to simulate two predictive water-management scenarios that evaluate potential changes in groundwater flow and groundwater-level conditions from the increased withdrawals in the Mount Pleasant, South Carolina area. The model was updated to include 2016-2019 groundwater use data for the Charleston aquifer wells in the Charleston, SC area, along with several periodic tape-down measurements at two recording wells (CHN-14 and BRK-431). The model was not recalibrated for this study. Two scenario simulations were completed, and the results are included in this data release. In scenario 1, Mount Pleasant Waterworks demonstrated reasonable need of 2,409 million gallons per year. This scenario simulates 5 of the 6 Mount Pleasant wells each pumping 1.32 million gallons per day from 2020 to 2050, for a total of 6.6 million gallons per day. No withdrawals from the sixth Mount Pleasant well are simulated during the 2020-2050 time period. In scenario 2, the South Carolina Department of Health and Environmental Control recommended withdrawal of 1,679 million gallons per year is simulated. This scenario simulates 5 of the 6 Mount Pleasant wells each pumping 0.92 million gallons per day from 2020 to 2050, for a total of 4.6 million gallons per day. No withdrawals from the sixth Mount Pleasant well are simulated during the 2020-2050 time period. This USGS data release contains all the input and output files for the simulations described above and in the readme.txt file of this data release (https://doi.org/10.5066/P9FA07XD).

An existing three-dimensional model (MODFLOW-2000) by Petkewich and Campbell was modified to simulate potential changes in groundwater-level conditions caused by withdrawals from a proposed well in the Middendorf aquifer near Monocks, South Carolina. A single well was added to the existing model in the cell at row 67 and column 119 in layer 7 (the Middendorf aquifer). Two scenarios were created by modifying the Base Case simulation which is documented in the model documentation report (https://pubs.usgs.gov/sir/2009/5185/) and data release (https://doi.org/10.5066/F7JW8C1K). The proposed well was pumped at 0.5 million gallons per day for the 'proposed well 1.5 MGD' scenario and 1.5 million gallons per day for the 'proposed well 1.5 MGD' scenario. This was the only change made to the model for this data release. This data release was created at the request of Mount Pleasant Waterworks to document the effects of a proposed well. This data release contains all of the model input and out files needed to run the model simulations described above. Data tables and figures of the model output are included in the ancillary directory. The data release also includes MODFLOW-2000 source code used to run the model simulations.

An existing three-dimensional model (MODFLOW-2000) by Petkewich and Campbell was modified to simulate potential changes in groundwater-level conditions caused by withdrawals from a proposed well in the Middendorf aquifer near Monocks, South Carolina. A single well was added to the existing model in the cell at row 67 and column 119 in layer 7 (the Middendorf aquifer). Two scenarios were created by modifying the Base Case simulation which is documented in the model documentation report (https://pubs.usgs.gov/sir/2009/5185/) and data release (https://doi.org/10.5066/F7JW8C1K). The proposed well was pumped at 0.5 million gallons per day for the 'proposed well 1.5 MGD' scenario and 1.5 million gallons per day for the 'proposed well 1.5 MGD' scenario. This was the only change made to the model for this data release. This data release was created at the request of Mount Pleasant Waterworks to document the effects of a proposed well. This data release contains all of the model input and out files needed to run the model simulations described above. Data tables and figures of the model output are included in the ancillary directory. The data release also includes MODFLOW-2000 source code used to run the model simulations.

The U. S. Geological Survey, in cooperation with the U.S. Environmental Protection Agency, developed a numerical ground-water-flow model, using MODFLOW-2000, to simulate ground-water flow in the Pohatcong Valley including the area within the Pohatcong Valley Ground Water Contamination Site. In 1978, the chlorinated solvents trichloroethene (TCE) and tetrachloroethene (PCE) were detected in thePohatcong Valley in production wells in Washington Borough and Washington Township, Warren County, New Jersey. Subsequent investigation revealed that many domestic wells in Washington and Franklin Townships also were contaminated, and in 1989 the Pohatcong Valley Ground Water Contamination Site was added to the U.S. Environmental Protection Agency (USEPA) National Priority List. A remedial investigation, by the USEPA and CH2M Hill with technical assistance from the U.S. Geological Survey (USGS), was begun in 1999. The simulation of ground-water flow in the Pohatcong Valley described here was conducted by the USGS in cooperation with the USEPA. The ground-water-flow model, using MODFLOW-2000 and the particle–tracking program MODPATH, estimated flow paths of groundwater from known sources of contamination in Washington Borough and tested possible site contamination remediation alternatives. Five ground-water remediation alternatives (GW2a, GW2b, GW3a, GW3b, and GW4b) were simulated. In addition, a 10-year solute transport simulation was conducted, using the USGS groundwater-transport process, to illustrate the potential for dispersion to increase the width of the solute plume. 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/sir20065269).

A three-dimensional groundwater flow model was developed to simulate the effects of withdrawals on the groundwater-flow systems of five aquifers in and around Ocean County, New Jersey—the unconfined Kirkwood-Cohansey aquifer system and Vincentown aquifer, and three confined aquifers--the Rio Grande water-bearing zone, the Atlantic City 800-foot sand, and the Piney Point aquifer. A transient model was used to simulate conditions that represent no groundwater withdrawals, 2000–2003 groundwater withdrawals, and maximum-allocation groundwater withdrawals. Particle-tracking analysis, using results from two steady-state simulations, determine flow paths and travel times to near-shore wells screened in the unconfined Kirkwood-Cohansey aquifer system, the Rio Grande water-bearing zone, and the Atlantic City 800-foot sand. Sources of water to wells in both unconfined and confined aquifers and travel times based on particle-tracking analysis are used to assess the susceptibility of selected wells to saltwater intrusion from bay or ocean water. 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/sir20165035).