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This model archive contains the model files for the MERAS 3 and Mississippi Delta groundwater flow models documented in the U.S. Geological Survey Scientific Investigations Report 2023-5100. The MERAS 3 model provides a simplified representation of groundwater flow in the Mississippi Embayment Regional Aquifer Study (MERAS) area for the period of 1900 through 2018, with the primary goal of providing boundary fluxes for inset models focused on local areas of interest. The Mississippi Delta model simulates groundwater flow in the Delta region of northwestern Mississippi from 1900 through 2018, using boundary fluxes from the MERAS 3 model. A scenario version of the Mississippi Delta model extends the simulation to...
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A proof-of-concept MODFLOW 6 groundwater model was developed to represent the bedrock, delta, and alluvially-deposited aquifers underlying the Mekong River Basin approximately between Phnom Penh, Cambodia and Cao Lanh, Vietnam. The model was constructed using square grid cells measuring 2,200 meters on each side. The proof-of-concept groundwater model was used to simulate environmental baseline conditions, representative of a 20-year period with stresses from November 1990 through October 2010. Additionally, a 20-year period of drier conditions with sea-level rise was also simulated that approximates the Mekong River Commission C3 climate scenario (drier climate with sea level rise; Mekong River Commission, 2019)....
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This data release contains MODFLOW 6 integrated hydrological model (IHM) that helps characterize the groundwater/surface-water interaction within the Sardon Catchment of western Spain. The model was used to quantify and reduce the overall model uncertainty to improve its reliability as a Decision Support Modeling (DSM) tool by improving the conceptualization and simulation of the overland flow process. The model was calibrated to groundwater heads, surface flows at the outlet of the model, and remotely sensed evapotranspiration data collected by the MODIS satellite. To help constrain the roughly 500,000 estimated parameters, observations of "actual" evapotranspiration (ET) were obtained from the remotely sensed...
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This model archive provides the necessary documentation of the numerical models developed for the Central Sands Lake study in central Wisconsin and will be included as a technical appendix (Appendix C) in the report to the Wisconsin State Legislature by the Wisconsin Department of Natural Resources (WDNR) in response to 2017 Wisconsin Act 10. This legislation directed DNR to determine whether existing and potential groundwater withdrawals are causing or are likely to cause significant reduction of mean seasonal water levels at Pleasant Lake, Long Lake, and Plainfield Lake (s. 281.34(7m)(2)(b), Wis. Stats.) in Waushara County, Wisconsin. To evaluate the potential hydrologic connection between groundwater withdrawals...
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This model archive contains model files and a complete repeatable workflow for source water delineation for groundwater supply wells in the Neversink/Rondout Basins of New York. The U.S. Geological Survey, in cooperation with the NYSDEC and NYSDOH, began an investigation in 2019 with the general objectives of (1) improving understanding of the regional groundwater flow system (2) delineating areas contributing recharge to eight priority production wells, and (3) quantifying the uncertainty of these contributing areas in a probabilistic way that can be used to inform decision-making related to priority well source water protection. To accomplish these objectives, a MODFLOW 6 groundwater model (version 6.2.1) was...
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This model archive contains files for a set of groundwater flow, particle tracking, and management optimization models that simulate the area around the Navy-Northrop-Grumman contamination plume on Long Island, New York. These models were developed as in insets from the Long Island Regional “parent” Model, from which perimeter boundary conditions were inherited. In addition to input and output files for these models, this archive contains the modeling workflow python code and source data used to build the model. These materials have been included for repeatability and decision transparency.
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Two MODFLOW 6 (version 6.2.1) models of hypothetical stream-aquifer systems are presented for the demonstration and utility of the Water Mover (MVR) Package available only with MODFLOW 6. Using a generalized approach, MVR facilitates the transfer of water among many arbitrary combinations of simulated features (i.e., pumping wells, stream, drains, lakes, etc.) within a MODFLOW 6 simulation. In this archive, the nature of the two hypothetical models are (1) simple ("model1" in the model.zip file) and complex ("model2" in the model.zip file). "Model1" relies on a previously published parent-child nested grid simulation (see "example 3" on page 30 at https://pubs.usgs.gov/tm/6a44/) that has been refactored for MODFLOW...
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A previously constructed numerical model (https://pubs.usgs.gov/pp/2007/1737a/) simulating the regional groundwater-flow system in the vicinity of the Wright-Patterson Air Force Base (WPAFB) near Dayton, Ohio, was updated to incorporate current hydrologic stresses and conditions and improve the usefulness of the model for water-supply planning and protection. The Great Miami Buried Valley Aquifer was designated a sole-source aquifer in 1988 and provides the supply for the substantial water use needs in the Dayton area. Hydrogeologic investigations of groundwater flow in the nearby WPAFB have been ongoing since the early 1990s, when the USGS first partnered with WPAFB to model groundwater flow near the Base in an...
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Seventy-five steady-state two-dimensional groundwater flow (MODFLOW-6) models of the shallow groundwater system were developed to map depth to water and estimate effective surficial transmissivity for the contiguous United States (CONUS). The models were driven by spatially-distributed recharge estimated by Reitz et al. (https://doi.org/10.5066/F7PN93P0) using average water-budget information for 1985-2015 and calibrated against long-term average water levels in observation wells, as well as, water-level estimates derived from perennial first-order streams and wetlands. The development of the model input and output files included in this data release, as well as post-processing used to derive additional water-budget...
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The hydrograph for well ER-5-3-2 in Frenchman Flat, southern Nevada, has previously unexplained water-level fluctuations. Four, three-dimensional, groundwater models (MODFLOW 6) were developed to evaluate potential stresses and hydrologic conditions affecting the well ER-5-3-2 hydrograph. Four model scenarios were developed that simulated: (1) wellbore leakage without recharge, (2) wellbore leakage with recharge, (3) shallow (low transmissivity) and deep (high transmissivity) carbonate rocks, and (4) lateral heterogeneity of carbonate rocks. Input and output files for the four model scenarios are in the model and output directories, respectively. Hydraulic conductivity, specific storage, and wellbore-leakage rates...


    map background search result map search result map MODFLOW models used to simulate groundwater flow in the Wisconsin Central Sands Study Area, 2012-2018 Groundwater Model Archive and Workflow for Neversink/Rondout Basin, New York, Source Water Delineation MODFLOW 6 models used to simulate the long-term average surficial groundwater system for the contiguous United States MODFLOW 6 model of two hypothetical stream-aquifer systems to demonstrate the utility of the new Water Mover Package (MVR) available only with MODFLOW 6 MODFLOW 6 and MODPATH 7 model data sets used for the update of the groundwater-flow model for the Great Miami Buried Valley Aquifer in the vicinity of Wright-Patterson Air Force Base near Dayton, Ohio MODFLOW 6 proof-of-concept groundwater model for the Mekong River Basin between Phnom Penh, Cambodia and Cao Lanh, Vietnam MODFLOW 6 models for simulating groundwater flow in the Mississippi Embayment with a focus on the Mississippi Delta MODFLOW6 models used to evaluate potential stresses and hydrologic conditions driving water-level fluctuations in well ER-5-3-2, Frenchman Flat, Southern Nevada MODFLOW 6 models for simulating groundwater flow and a proposed remediation system in the sole-source aquifer system in southeastern Nassau County, New York MODFLOW 6 models for assimilating remote sensing evapotranspiration in ensemble-based framework to enhance cascade routing and re-infiltration concept in integrated hydrological models applied to support decision making MODFLOW 6 model of two hypothetical stream-aquifer systems to demonstrate the utility of the new Water Mover Package (MVR) available only with MODFLOW 6 MODFLOW 6 models for assimilating remote sensing evapotranspiration in ensemble-based framework to enhance cascade routing and re-infiltration concept in integrated hydrological models applied to support decision making MODFLOW 6 models for simulating groundwater flow and a proposed remediation system in the sole-source aquifer system in southeastern Nassau County, New York Groundwater Model Archive and Workflow for Neversink/Rondout Basin, New York, Source Water Delineation MODFLOW6 models used to evaluate potential stresses and hydrologic conditions driving water-level fluctuations in well ER-5-3-2, Frenchman Flat, Southern Nevada MODFLOW 6 and MODPATH 7 model data sets used for the update of the groundwater-flow model for the Great Miami Buried Valley Aquifer in the vicinity of Wright-Patterson Air Force Base near Dayton, Ohio MODFLOW models used to simulate groundwater flow in the Wisconsin Central Sands Study Area, 2012-2018 MODFLOW 6 proof-of-concept groundwater model for the Mekong River Basin between Phnom Penh, Cambodia and Cao Lanh, Vietnam MODFLOW 6 models for simulating groundwater flow in the Mississippi Embayment with a focus on the Mississippi Delta MODFLOW 6 models used to simulate the long-term average surficial groundwater system for the contiguous United States