Simulations of the Long Island Aquifer System Response to Potential Changes in Future Hydrologic Conditions, Long Island, New York (ver. 1.1, June 2025)

This data release contains simulation results from fifteen transient, regional-scale numerical models of the Long Island aquifer system that predict aquifer conditions resulting from possible future changes in pumping and recharge stresses and sea level altitude. These models are based on the MODFLOW 6 numerical model that is documented in Walter and others (2024), which simulates historical water levels, streamflows, and the position of the saltwater interface in response to time-varying changes in pumping and recharge stresses for the period 1900-2019. The archive for that model is available online (Jahn and others, 2024). Fifteen model-input data sets of possible future scenarios are used to simulate aquifer conditions at annual and seasonal time scales under a variety of recharge, pumping, and sea level rise (3, 6, and 9 feet) stresses. This data release contains descriptions of the fifteen model scenarios, the model input files, and software to allow the user to run the models for each of the fifteen scenarios. Detailed instructions on how to run the models are documented in ReadMe_Main.txt. First posted August 16, 2024, ver 1.0 Revised June 2025, ver 1.1 Version 1.1: This version of the dataset now includes the model files for scenario 7 (sc_7) extended out to 30 simulated years, and the 1000 mg/L shapefiles for scenario 7 (sc_7) have also been updated accordingly. The superfluous copies of the isochlor shapefiles were removed for all scenarios. Version 1.0: In this version of the dataset, scenario 7 (sc_7) was simulated for 25 years, rather than the 30 years the other scenarios were simulated. Thus, the scenario 7 (sc_7) shapefiles for the 1000 mg/L isochlors were showing results that were short 5 years of simulation. All of the scenarios each included a superfluous copy of the isochlor shapefiles (following naming convention: "sc_##_1000mgL_isochlor") that did not need to be included in the release. These superfluous copies were not described in the readme and were simply duplicates of data already in the release.

                                            [
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                                            {
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