Modifications of the U.S. geological survey modular, finite-difference, ground-water flow model to read and write geographic information system files

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Title Modifications of the U.S. geological survey modular, finite-difference, ground-water flow model to read and write geographic information system files
Creator Orzol, Leonard L.; McGrath, Timothy S.
Subject Groundwater; Groundwater flow
Description ABSTRACT This report documents modifications to the U.S. Geological Survey modular, three-dimensional, finite-difference, ground-water flow model, commonly called MODFLOW, so that it can read and write files used by a geographic information system (GIS). The modified model program is called MODFLOWARC. Simulation programs such as MODFLOW generally require large amounts of input data and produce large amounts of output data. Viewing data graphically, generating head contours, and creating or editing model data arrays such as hydraulic conductivity are examples of tasks that currently are performed either by the use of independent software packages or by tedious manual editing, manipulating, and transferring data. Programs such as GIS programs are commonly used to facilitate preparation of the model input data and analyze model output data; however, auxiliary programs are frequently required to translate data between programs. Data translations are required when different programs use different data formats. Thus, the user might use GIS techniques to create model input data, run a translation program to convert input data into a format compatible with the ground-water flow model, run the model, run a translation program to convert the model output into the correct format for GIS, and use GIS to display and analyze this output. MODFLOWARC, avoids the two translation steps and transfers data directly to and from the ground-water-flow model. This report documents the design and use of MODFLOWARC and includes instructions for data input/output of the Basic, Block-centered flow, River, Recharge, Well, Drain, Evapotranspiration, Generalhead boundary, and Streamflow-routing packages. The modification to MODFLOW and the Streamflow- Routing package was minimized. Flow charts and computer-program code describe the modifications to the original computer codes for each of these packages. Appendix A contains a discussion on the operation of MODFLOWARC using a sample problem.
Publisher U.S. Geological Survey
Contributors Intergovernmental Resource Center, Clark County, Washington
Date 1992
Type Text
Format application/pdf
Digitization Specifications pdf file copied from USGS website (http://or.water.usgs.gov/ ). Uploaded into CONTENTdm version 3.7.
Identifier http://or.water.usgs.gov/projs_dir/modflowarc/modflowarc.html
Source Orzol, Leonard L. and McGrath, Timothy S., Modifications of the U.S. geological survey modular, finite-difference, ground-water flow model to read and write geographic information system files, Portland, Oregon: U.S. Geological Survey Open-File Report 92-50, 208 p.
Language eng
Rights Management Public Domain, Courtesy of the USGS
Holding Institution University of Utah
Metadata Cataloger Seung Hoon Yoo; Kristin Willmore
ARK ark:/87278/s6tx3d9d
Setname wwdl_er
Date Created 2004-12-17
Date Modified 2005-10-13
ID 1145776
Reference URL https://collections.lib.utah.edu/ark:/87278/s6tx3d9d
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