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MODFLOW-NWT groundwater model demonstrating groundwater model calibration with repeat microgravity measurements

Metadata Updated: October 26, 2023

A numerical model was developed using MODFLOW-NWT and FloPy to simulate groundwater flow and demonstrate a practical method for incorporating repeat microgravity observations (i.e., small changes in the acceleration due to Earth’s gravity) as a new type of calibration target for groundwater-flow models. The single-layer, 250-m cell size model was kept relatively simple to focus on the value of repeat microgravity data in the East Mesa area of the Imperial Valley, in the vicinity of the All American Canal, southeast California, USA. The method is demonstrated with repeat microgravity data collected over a 10-year period following the lining of the All American Canal with concrete. This lining of the canal resulted in the removal of a large source of seepage (recharge) causing groundwater levels, groundwater storage, and gravity all to declined considerably. The study area and field data are used to demonstrate a novel forward gravity modeling application linked to MODFLOW input and output files. The analysis demonstrates that including gravity data, compared to drawdown data alone, improves model parameter identifiability and reduces uncertainty in parameter estimates. This USGS data release contains all of the input and output files for the simulations described in the associated journal article (

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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 October 26, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 26, 2023
Publisher U.S. Geological Survey
Identifier USGS:79e2e22d-b0cb-4b3b-a9a5-d9f32f679d22
Data Last Modified 20220105
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 37475700-8ff5-40d8-b042-5105cc760699
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -115.34,32.57,-114.6039,33.0823
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 007bab980fcb2eb0821b7678889f8fa44da7e80173efd01bc505c0dd2fe97909
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -115.34, 32.57, -115.34, 33.0823, -114.6039, 33.0823, -114.6039, 32.57, -115.34, 32.57}

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