Oklahoma Water Science Center
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Prepared in cooperation with the Oklahoma Water Resources Board
Hydrogeology and Simulation of Groundwater Flow in the Arbuckle-Simpson Aquifer, South-Central Oklahoma
By Scott Christenson, Noel I. Osborn, Christopher R. Neel, Jason R. Faith, Charles D. Blome, James Puckette, and Michael P. Pantea
The eastern Arbuckle-Simpson aquifer MODFLOW models are being made available to the general public as a convenience for those wishing to replicate the simulations of the groundwater flow as documented in USGS Scientific Investigations Report 2011-5029: "Hydrogeology and Simulation of Groundwater Flow in the Arbuckle-Simpson Aquifer, South-Central Oklahoma". Any changes made to the model files after transmission from the USGS could have unintended consequences. These consequences could include, but may not be limited to: erroneous model output, numerical instabilities, and violations of underlying assumptions about the subject hydrologic system that are inherent in results presented in USGS Scientific Investigations Report 2011-5029. The USGS assumes no responsibility for the consequences of any changes made to the model files. If changes are made to the model, the user is responsible for documenting the changes and justifying the results and conclusions.
Groundwater flow in the eastern Arbuckle-Simpson aquifer was simulated using a modified version of MODFLOW-2000. A single change was made to the standard MODFLOW-2000 version 1.18 by Arlen Harbaugh, one of the authors of MODFLOW-2000. The standard MODFLOW-2000 was modified to allow up to 2,000 time steps. The modified MODFLOW executable (mf2k2ksp.exe) and related files are available to the public with the downloaded model-input data in a compressed file linked below.
Note: To use the eastern Arbuckle-Simpson aquifer MODFLOW models effectively, the user should have a detailed understanding of hydrology, groundwater flow, groundwater-flow modeling, and MODFLOW. Specific information pertaining to the model is available in the README file. For a description of MODFLOW-2000 input files, refer to Online Guide to MODFLOW-2000 at: