| Abstract: | Many groundwater-management problems are concerned with the control of one or more variables that reflect the state of a groundwater-flow system or a coupled groundwater/surface-water system. These system state variables include the distribution of heads within an aquifer, streamflow rates within a hydraulically connected stream, and flow rates into or out of aquifer storage. This report documents the new State Variables Package for the Groundwater-Management Process of MODFLOW-2005 (GWM-2005). The new package provides a means to explicitly represent heads, streamflows, and changes in aquifer storage as state variables in a GWM-2005 simulation. The availability of these state variables makes it possible to include system state in the objective function and enhances existing capabilities for constructing constraint sets for a groundwater-management formulation. The new package can be used to address groundwater-management problems such as the determination of withdrawal strategies that meet water-supply demands while simultaneously maximizing heads or streamflows, or minimizing changes in aquifer storage. Four sample problems are provided to demonstrate use of the new package for typical groundwater-management applications. |
| Genre: | USGS Numbered Series |
| ProdID: | 99083 |
| Citation Author: | Ahlfeld, David P.; Barlow, Paul M.; Baker, Kristine M. |
| Citation Contributing Office: | Office of Groundwater |
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| Citation Language: | ENGLISH |
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| Citation No Pagination: | N |
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| Citation Online Only Flag: | N |
| Citation Phsyical Description: | vii, 45 p. |
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| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Techniques and Methods |
| Citation Series Code: | TM |
| Citation Series Number: | 6-A36 |
| Citation Search Results Text: | Documentation for the State Variables Package for the Groundwater-Management Process of MODFLOW-2005 (GWM-2005); 2011; TM; 6-A36; Ahlfeld, David P.; Barlow, Paul M.; Baker, Kristine M. |
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| Citation Year: | 2011 |
| Type: | citation/reference |
| Text: | Documentation for the State Variables Package for the Groundwater-Management Process of MODFLOW-2005 (GWM-2005); 2011; TM; 6-A36; Ahlfeld, David P.; Barlow, Paul M.; Baker, Kristine M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/tm_6_A36.gif |
| URL (INDEX PAGE): | http://pubs.usgs.gov/tm/tm6-a36/ |
| Date Other: | Wed, 9 Mar 2011 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
