MODFLOW-NWT inset models from the regional Lake Michigan Basin Model in support of groundwater age calculations for glacial aquifers

Metadata Updated: November 12, 2020

Five MODFLOW-NWT inset models were extracted from the Lake Michigan Basin (LMB) regional model ( These inset models were designed to serve as a training ground for metamodels of groundwater age in glacial wells. The study areas of the inset models correspond to HUC8 basins. Two of the basins are tributary to Lake Michigan from the east, two are tributary to the lake from the west, and one is located outside the western boundary of the Lake Michigan topographic basin. The inset models inherit many of the inputs to the parent LMB model, such as its hydrostratigraphy and layering scheme, the hydraulic conductivity assigned bedrock layers, the recharge distribution, and water use in the form of pumping rates from glacial and bedrock wells. The construction of the inset models entails modifying some inputs, most notably the grid spacing (reduced from cells 5000-ft on a side in the parent model to 500-ft on a side in the inset models). The refined grid spacing allowed more precise location of pumping wells and more detailed simulation of groundwater/surface-water interactions. Also modified are the glacial hydraulic conductivity values, the top bedrock surface elevation, and the surface-water network input to the inset models. The inset models are solved using the MODFLOW-NWT code which allows for more robust handling of conditions in unconfined aquifers than previous versions of MODFLOW. The particle-tracking code MODPATH was used to simulate the distribution of age of groundwater discharging to wells pumping from glacial deposits. This USGS data release contains all of the input and output files for the simulation of the inset models of the Lake Michigan Basins model as described in the associated model documentation report (

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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 Date January 4, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) January 1, 2018 (publication)
Frequency Of Update notPlanned

Metadata Source

Harvested from DOI Open Data

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Image of the model domain and active area of the model.

Additional Metadata

Resource Type Dataset
Metadata Date January 4, 2017
Metadata Created Date November 12, 2020
Metadata Updated Date November 12, 2020
Reference Date(s) January 1, 2018 (publication)
Responsible Party U.S. Geological Survey (Point of Contact)
Contact Email
Access Constraints Use Constraints: none, Access Constraints: None. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from this data release.
Bbox East Long -84.216453
Bbox North Lat 46.333849
Bbox South Lat 41.859172
Bbox West Long -88.808187
Coupled Resource
Frequency Of Update notPlanned
Graphic Preview Description Image of the model domain and active area of the model.
Graphic Preview File
Graphic Preview Type jpg
Licence The data have been approved for release by the U.S. Geological Survey (USGS). Although the data have been subjected to rigorous review and are substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, the data are released on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from authorized or unauthorized use. Although the data, software, and related material have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 2001-01-01
Temporal Extent End 2005-12-31

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