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GFLOW groundwater flow model for the northern part of the Nicolet Unit of the Chequamegon-Nicolet National Forest, Wisconsin

Metadata Updated: July 6, 2024

The model simulates two-dimensional groundwater flow and base flow in streams in the northern Nicolet Unit of the Chequamegon-Nicolet National Forest using the analytic element program GFLOW (Haitjema, 1995). Significant streams and lakes in the model domain are represented at varying levels of detail as linesink elements fully connected to the groundwater system. The highest level of detail is given to surface water features within the Forest Unit, while greatly simplified features around the perimeter of the model provide a boundary condition for the groundwater flow system. Groundwater discharge to the linesinks is computed, and routed through the surface water network as base flow. Recharge to the groundwater system was obtained from a separate soil-water-balance (SWB) model, which uses topography, soils, land use, and climatic data to estimate recharge as deep drainage from the soil zone. Estimated average annual recharge rates were supplied to the GFLOW model on a regular 1-km grid covering the model domain, using the Hybrid GFLOW-MODFLOW feature of GFLOW.

The model was calibrated to groundwater levels, interpreted lake stages, and estimated annual base flows in streams, \with an emphasis on data collected since 1970. Parameters representing hydraulic conductivity, groundwater recharge, and surface water bed-sediment resistance were adjusted using the parameter estimation program PEST, to produce simulated groundwater levels and base flow estimates that agree with field measurements, and input parameter values that are consistent with previous studies and the conceptual understanding of the area. This USGS data release contains all of the input and output for the simulations described in the published report, which can be found in the main directory of this data release.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date July 6, 2024

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date July 6, 2024
Publisher U.S. Geological Survey
Identifier USGS:c88f6c99-314e-4df5-b90c-afb1e1b8661e
Data Last Modified 20201117
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 81c78f31-abae-4eca-a79b-5f037f21d758
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -89.391133,45.560054,-88.199543,46.249389
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 2c05aad3f637fa2f71b01e2f424c1427e15688a436b9ff561907727801224ea8
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -89.391133, 45.560054, -89.391133, 46.249389, -88.199543, 46.249389, -88.199543, 45.560054, -89.391133, 45.560054}

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