A three-dimensional, surface-water/groundwater model (MODFLOW-NWT with the Surface-Water Routing Process) was developed to the predict the effects of groundwater pumpage on canal leakage and regional groundwater flow in urban portions of Miami-Dade County, Florida. The model was calibrated by using observation data collected from 1997 through 2004. The model calibration was verified using observation data collected from 2005 through 2010. The model is designed to simulate surface-water stage and discharge in the managed canal system and dynamic canal leakage to the Biscayne aquifer as well as seepage to the canal from the aquifer. The model was used to evaluate the effect of increased groundwater pumpage and (or) increased sea level on canal leakage, regional groundwater flow, and the position of the freshwater-seawater interface. 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/sir20145162). This data release also includes (1) postprocessing python scripts, (2) python source code used by pre-processing scripts, (3) MODFLOW-NWT (v 1.0.8) source code with the General Finite Difference (GFD) boundary package, and (4) ZONEBUDGET (v 3.01) source code.

The U.S. Geological Survey, in cooperation with Broward County Environmental Planning and Resilience Division, has developed a groundwater/surface-water model to evaluate the response of the drainage infrastructure and groundwater system in Broward County to increases in sea level and potential changes in precipitation. The model was constructed using a modified version of MODFLOW-NWT, with the surface-water system represented using the Surface-Water Routing process and the Urban Runoff Process. The surface-water drainage system within this newly developed model actively simulates the extensive canal network using level-pool routing and active structures representing gates, weirs, culverts, and pumps. Steady-state and transient simulation results represented historical conditions (2013-17). Simulation results incorporating increased sea level and precipitation were used to evaluate the effects on the surface-water drainage system and wet season groundwater levels. Four future sea-level scenarios were simulated by modifying the historical inputs for both the steady-state and the transient models to represent mean sea levels of 0.5, 2.0, 2.5, and 3.0 ft above the North American Vertical Datum of 1988. 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/sir20225074)

The U.S. Geological Survey, in cooperation with Broward County Environmental Planning and Resilience Division, has developed a groundwater/surface-water model to evaluate the response of the drainage infrastructure and groundwater system in Broward County to increases in sea level and potential changes in precipitation. The model was constructed using a modified version of MODFLOW-NWT, with the surface-water system represented using the Surface-Water Routing process and the Urban Runoff Process. The surface-water drainage system within this newly developed model actively simulates the extensive canal network using level-pool routing and active structures representing gates, weirs, culverts, and pumps. Steady-state and transient simulation results represented historical conditions (2013-17). Simulation results incorporating increased sea level and precipitation were used to evaluate the effects on the surface-water drainage system and wet season groundwater levels. Four future sea-level scenarios were simulated by modifying the historical inputs for both the steady-state and the transient models to represent mean sea levels of 0.5, 2.0, 2.5, and 3.0 ft above the North American Vertical Datum of 1988. 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/sir20225074)

A three-dimensional, groundwater flow model (MODFLOW-NWT) was developed to examine groundwater storage changes in the Quincy Basin, Washington. The model was calibrated to conditions from 1920 to 2013. The model was used to (1) determine the change in groundwater storage from 1920 to 2013 , and (2) simulate the potential effects of increases in pumping, decrease in irrigation recharge, and increases in streamflow in Crab Creek by 100 cubic feet per second and 500 cubic feet per second. 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/sir20185162).

This groundwater-flow model archive contains all of the input and output files for an inset MODFLOW-NWT model extracted from the northern (Wisconsin) half of a published USGS steady-state regional model of the Upper Fox River Basin in the U.S. Upper Midwest. The construction and details of the published USGS steady-state model of the Upper Fox River Basin is outlined in the U.S. Geological Survey Scientific Investigations Report 2018-5038 (https://doi.org/10.3133/sir20185038). The regional model is archived in the data release at https://doi.org/10.5066/F76D5R5V. The extracted model was used to demonstrate an innovative new method for delinating fen distribution and discharge using the MODFLOW UZF package. The extracted model incorporates the Mukwonago River Basin, a 10-digit hydrologic unit code (HUC10) basin occupying 86.2 mi2 (223 km2) in southeastern Wisconsin. The extracted model was used to demonstrate how regional and local flow patterns can be enhanced by adding a version of the UZF file that automatically inserts “seepage drains” in cells where the water table is near the land surface (within the “undulation depth”). Details on the extracted model construction and calibration, including preparation of the “stripped-down” UZF file central to the proposed fen delineation method can be found in the supporting information of the journal article in Groundwater (https://doi.org/10.1111/gwat.12931). This USGS data release contains all of the input and output files for the simulations described in the journal article in Groundwater (https://doi.org/10.1111/gwat.12931).

A previously developed three-dimensional groundwater-flow model that used the MODFLOW-NWT code was updated to simulate the effects of various proposed drainage modifications aimed at reducing discharge to a sanitary sewer system near Long Lake in Indiana Dunes National Lakeshore, near Gary, Indiana. The original steady-state model documented in the USGS report (https://pubs.usgs.gov/sir/2013/5003/) and data release (https://doi.org/10.5066/F7D21VS2) was calibrated to a low groundwater level/dry weather condition of October 2002 and a high groundwater level/wet weather condition of March 2011. For this study the 2002 and 2011 simulations were updated with elevation data collected from a 2017 survey of primary surface-water features that affect groundwater levels to create dry- or wet-weather “base” simulations (figs. 1 and 2). Eight scenario models were created by modifying the updated 2002 and 2011 base simulations. The scenarios examined the effects of potential modifications to the hydrologic system: (scenario 1a) diverting water from US-12 weir (site CS-1) to County Line Road ditch through underground pipes [figs. 3-6], (scenario 1b) diverting water from US-12 ditch to Spencer ditch, then trenching Spencer ditch to the County Line Road ditch to drain to the Little Calumet River [figs. 7 and 8], (scenario 2) Extending and altering US-12 ditch to flow east toward County Line Road ditch and drain to the Little Calumet River [figs. 9 and 10], and (scenario 3) installing culverts under US-12 and adjacent railroad lines to connect US-12 ditch with West Long Lake [figs. 11-14]. This data release contains all files and associated information needed to run these additional simulations. Changes in water-table position for each scenario simulation are categorized in figures in this data release as (1) within 7 feet of the land surface, (2) within 3 feet of the land surface, or (3) above land surface and are expressed relative to the water-table position simulated in the updated dry- or wet-weather base simulations. The descriptions focus primarily on changes to the distribution of groundwater towards the center of the model domain. Groundwater distributions towards the western edge (west of Grand Blvd.), southwest (south of US-20), and eastern edge (towards Ogden Dunes) of model domain show relatively small variations in the scenario simulations and are outside of the primary area of interest. The scenario of rerouting water from entry into the Gary sanitary sewer system at the weir at site CS-1 to County Line Road ditch through underground pipes (scenario 1a; figs. 3-6) used the MODFLOW Drain Return Package to transmit water from the US-12 ditch to a drain return cell at the intersection of County Line Road ditch and 5th Avenue. This simulated hydrologic modification produced an expanded area of shallow groundwater within 7 feet of the land surface in the areas surrounding the drain return cell location. A small groundwater mound developed in the dry-weather underground pipes simulation at the intersection of County Line Road and 5th Avenue, with the water table within 3 feet of the land surface. In the dry-weather underground pipes simulation (figs. 3 and 4), the portions of the area between Union Street and County Line Road ditch were inundated. Water-table position changes north of US-12 or west of Spencer Street were minimal. In the wet-weather underground pipes simulation (figs. 5 and 6), water ponded at the intersection of County Line Road and East 5th Avenue. Both dry- and wet-weather underground pipes simulations exhibited similar patterns of water-table changes, but differences between water-table positions in the underground pipes and updated wet-weather base simulations were minimal in areas away from the drain return cell. The scenario of diverting water from US-12 ditch to Spencer ditch then trenching to the County Line Road ditch (scenario 1b; figs. 7 and 8) required creation of new drain cells to connect the southern

A previously published groundwater flow model (https://pubs.usgs.gov/sir/2005/5089/) was revised with refined grid spacing and updated hydrogeolgic framework and hydrologic properties (http://doi.org/10.3133/sir20155061) and used in this study to predict the effects of Upper Floridan aquifer (UFA) groundwater pumpage on horizontal hydraulic-head gradients in the upper-water-bearing zone of the UFA in the downtown Brunswick area, Glynn County, Georgia. The model used MOFLOW-2000 and was calibrated using groundwater-use information for October 2015, which was the basis for the 2015 Base Case simulation. A comparison of the 2015 Base Case simulation with seven groundwater-management scenarios evaluated potential changes to the upper-water-bearing zone of the UFA near downtown Brunswick. Particle-tracking analysis, using MODPATH, provided pathlines and time-of-travel for the 2015 Base Case simulation and scenario C. 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/sir20195035).

A previously published groundwater flow model (https://pubs.usgs.gov/sir/2005/5089/) was revised with refined grid spacing and updated hydrogeolgic framework and hydrologic properties (http://doi.org/10.3133/sir20155061) and used in this study to predict the effects of Upper Floridan aquifer (UFA) groundwater pumpage on horizontal hydraulic-head gradients in the upper-water-bearing zone of the UFA in the downtown Brunswick area, Glynn County, Georgia. The model used MOFLOW-2000 and was calibrated using groundwater-use information for October 2015, which was the basis for the 2015 Base Case simulation. A comparison of the 2015 Base Case simulation with seven groundwater-management scenarios evaluated potential changes to the upper-water-bearing zone of the UFA near downtown Brunswick. Particle-tracking analysis, using MODPATH, provided pathlines and time-of-travel for the 2015 Base Case simulation and scenario C. 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/sir20195035).

A three-dimensional, steady-state groundwater-flow model representing 2003-13 mean hydrologic conditions was developed and calibrated to assess groundwater and lake-water exchanges and the effects of groundwater withdrawals and precipitation on water levels in lakes in the northeast Twin Cities Metropolitan Area, Minnesota. The USGS groundwater-flow model program MODFLOW-NWT version 1.0.8 was used to simulate groundwater flow in the approximately 1,000-square-mile area of the northeast Twin Cities Metropolitan Area and western Wisconsin. Water levels were below normal for several lakes in the northeast Twin Cities Metropolitan Area during 2003 through 2013. Previous periods of low lake-water levels generally correlate with periods of below-normal precipitation but increases in groundwater withdrawals and land-use changes have put into question whether recent lake-water-level declines are due solely to declines in precipitation. The groundwater-flow model was developed to provide a thorough understanding of regional groundwater and surface-water exchanges under different groundwater withdrawal and precipitation scenarios. This USGS data release contains all of the input and output files for the simulations described in the associated U.S. Geological Survey Scientific Investigations Report 2016-5139B (https://doi.org/10.3133/sir20165139B). This data release also contains input and output data for ancillary soil-water balance (SWB) models used to simulate runoff to a subset of lakes and areal groundwater recharge.

A three-dimensional, steady-state groundwater-flow model representing 2003-13 mean hydrologic conditions was developed and calibrated to assess groundwater and lake-water exchanges and the effects of groundwater withdrawals and precipitation on water levels in lakes in the northeast Twin Cities Metropolitan Area, Minnesota. The USGS groundwater-flow model program MODFLOW-NWT version 1.0.8 was used to simulate groundwater flow in the approximately 1,000-square-mile area of the northeast Twin Cities Metropolitan Area and western Wisconsin. Water levels were below normal for several lakes in the northeast Twin Cities Metropolitan Area during 2003 through 2013. Previous periods of low lake-water levels generally correlate with periods of below-normal precipitation but increases in groundwater withdrawals and land-use changes have put into question whether recent lake-water-level declines are due solely to declines in precipitation. The groundwater-flow model was developed to provide a thorough understanding of regional groundwater and surface-water exchanges under different groundwater withdrawal and precipitation scenarios. This USGS data release contains all of the input and output files for the simulations described in the associated U.S. Geological Survey Scientific Investigations Report 2016-5139B (https://doi.org/10.3133/sir20165139B). This data release also contains input and output data for ancillary soil-water balance (SWB) models used to simulate runoff to a subset of lakes and areal groundwater recharge.