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Drilling Industry News

Studying Ground Water and Surface Water Interaction

April 22, 2008

A new model to simulate ground water and surface-water interactions has been released by the U.S. Geological Survey (USGS). The Ground water and Surface-water FLOW (GSFLOW) model simultaneously accounts for climatic conditions, runoff across the land surface, subsurface flow and storage, and the connections among terrestrial systems, streams, lakes, wetlands and ground water.

"GSFLOW can be used to analyze many complex water-resource questions faced by society that increasingly involve understanding the connectivity of surface water and ground water," says Robert Hirsch, USGS Associate Director for Water. GSFLOW can be used to examine issues such as the effects of water-resource development on streamflow, wetlands or ground water resources of a watershed, how ground water recharge and streamflow conditions will respond to changes in land use throughout a watershed, and how hydrologic conditions and aquatic resources of a watershed change in response to climate variability.

The GSFLOW model will be used in examining water availability under the Survey's proposed Water for America Initiative. A major aspect of the initiative, which plans to complete a comprehensive census of the nation's water resources in the next 10 years, is to investigate how ground water and surface water interactions affect the overall availability of the resource. GSFLOW is applicable to watersheds that range from a few square miles to several thousand, and for time periods that range from months to several decades. Initial applications of GSFLOW are underway in Pennsylvania, Wisconsin, California and Nevada through the USGS Cooperative Water Program. Because of the complexity of the GSFLOW model, interdisciplinary teams of scientists are working on these important initial applications.

GSFLOW is available free to all users by visiting: http://water.usgs.gov/nrp/gwsoftware/gsflow/gsflow.html.

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