Documentation for the State Variables Package for the Groundwater-Management Process of MODFLOW-2005 (GWM-2005)

Techniques and Methods 6-A36
By: , and 

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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.

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Documentation for the State Variables Package for the Groundwater-Management Process of MODFLOW-2005 (GWM-2005)
Series title Techniques and Methods
Series number 6-A36
DOI 10.3133/tm6A36
Edition -
Year Published 2011
Language ENGLISH
Publisher U.S. Geological Survey
Contributing office(s) Office of Groundwater
Description vii, 45 p.
Online Only (Y/N) N
Additional Online Files (Y/N) N