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GroMoPo Metadata for Lake Michigan Basin unstructured grid USGS model

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Created: Feb 07, 2023 at 2:49 p.m.
Last updated: Feb 07, 2023 at 2:50 p.m.
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In order to better represent the configuration of the stream network and simulate local groundwater-surface water interactions, a version of MODFLOW with refined spacing in the topmost layer was applied to a Lake Michigan Basin (LMB) regional groundwaterflow model developed by the U. S. Geological. Regional MODFLOW models commonly use coarse grids over large areas; this coarse spacing precludes model application to local management issues (e. g., surface-water depletion by wells) without recourse to labor-intensive inset models. Implementation of an unstructured formulation within the MODFLOW framework (MODFLOW-USG) allows application of regional models to address local problems. A "semi-structured" approach (uniform lateral spacing within layers, different lateral spacing among layers) was tested using the LMB regional model. The parent 20-layer model with uniform 5000-foot (1524-m) lateral spacing was converted to 4 layers with 500-foot (152-m) spacing in the top glacial (Quaternary) layer, where surface water features are located, overlying coarser resolution layers representing deeper deposits. This semi-structured version of the LMB model reproduces regional flow conditions, whereas the finer resolution in the top layer improves the accuracy of the simulated response of surface water to shallow wells. One application of the semi-structured LMB model is to provide statistical measures of the correlation between modeled inputs and the simulated amount of water that wells derive from local surface water. The relations identified in this paper serve as the basis for metamodels to predict (with uncertainty) surface-water depletion in response to shallow pumping within and potentially beyond the modeled area, see Fienen et al. (2015a).

Subject Keywords



Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
United States
North Latitude
East Longitude
South Latitude
West Longitude


Additional Metadata

Name Value
DOI 10.1111/gwat.12389
Depth 2438.4
Scale Regional
Layers 2-5 layers
Purpose groundwater resources;decision support
GroMoPo_ID 57
IsVerified True
Model Code MODFLOW
Model Link
Model Time SS
Model Year 2016
Model Authors D. T. Feinstein, M.N. Fienen, H. W. Reeves, C. D. Langevin
Model Country United States
Data Available report/paper only
Developer Email
Dominant Geology Model focuses on multiple geologic materials
Developer Country USA
Publication Title A Semi-Structured MODFLOW-USG Model to Evaluate Local Water Sources to Wells for Decision Support
Original Developer No
Additional Information
Integration or Coupling None of the above
Evaluation or Calibration static water levels;baseflow
Geologic Data Availability

How to Cite

GroMoPo, C. Mohan (2023). GroMoPo Metadata for Lake Michigan Basin unstructured grid USGS model, HydroShare,

This resource is shared under the Creative Commons Attribution CC BY.


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