This report describes the input preparation process for GSFLOW, version 1.1, specifically, the creation of the PRMS Data File, the GSFLOW maps, the PRMS Parameter File, and the MODFLOW Input Files.
These instructions are not the only way to prepare input for GSFLOW, but are intended to serve as a procedural guide. Clearly, any single step from the outline below, could involve (and may require) much more effort, study, and expertise from a GSFLOW modeler or modeling team. Anyone considering a GSFLOW modeling project is encouraged to work through this outline and complete the example problem to gain insight into what will be required to develop a full application.
The USGS has corporate policies about the hardware and software tools which are made available to its employees and cooperators. These instructions reflect these policies and are not intended to endorse any particular trade, product, or firm. These instructions can (and have been) successfully carried out with many alternative hardware and software configureations.
1.2. Software Requirements
The following software packages are required to prepare input for GSFLOW:
USGS Downsizer (available only on USGS computers)
ESRI ArcMap and Workstation (version 9.3), including a license for the Spatial Analyst extension
CRWR ArcHydro extension to ArcMap
XTools Pro extension to ArcMap
USGS PRMS Paramtool
1.3. Hardware Requirements
The following represents a minimum hardware configuration to prepare input for GSFLOW:
PC with Windows XP Operating System
2.0 GHz PC (or higher) Processor
1 GB (or higher) RAM
100 GB (or higher) Hard Disk
SVGA, 1024x768 resolution, 16 bit color (or better) Monitor
32 MB RAM (or higher), 24 bit true color Graphics Card
1.4. Download Example Problem Data Sets
The data for the following example is available here.
These steps should be completed in order, as later steps may require maps or data produced in earlier steps.
Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.
Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. For further information, please see the standard USGS Disclaimer.