New in GWRP

• Regional Groundwater Studies
  • Groundwater Availability in the United States
• Water Availability Pilot
  • Consumptive water use coefficients for Great Lakes Basin
• Groundwater & the Environment
  • Groundwater Recharge in Southwestern US
• Methods & Modeling
  • SEAWAT v4--Simulation of 3D variable-density ground--water flow and transport
• Data & Information
  • Water-Level changes in aquifers of the Atlantic Coastal Plain, predevelopment to 2000

USGS in Your State

USGS Water Science Centers are located in each state.

Groundwater Model Development

The USGS is at the forefront of devising new techniques to solve practical problems in the study of groundwater resources. Predictive models are needed to make informed decisions in many emerging areas related to the effects of groundwater development. New models and methods enhance all USGS water programs. State and local governments as well as groundwater scientists and engineers in the private sector regularly use USGS models as an integral part of their work.

The USGS Modular Ground-Water Flow Model (MODFLOW) is the most widely used program in the world for simulating groundwater flow. The Groundwater Resources Program continues to support the enhancement of MODFLOW with updates that help scientists and engineers simulate common features in groundwater systems. The USGS developed MODFLOW in the early 1980s. Since that time, new features have been added and the software has been updated to incorporate advancements in our understanding of groundwater hydrology, to respond to changes in user needs, and to take advantage of constantly increasing computer power and speeds.

Recent Releases

CFP: Conduit Flow Process for MODFLOW-2005

The conduit flow process (CFP) for MODFLOW-2005 allows the user to simulate turbulent or laminar groundwater flow conditions in dual porosity aquifers.
(Version 1.0 released April 2008)
http://water.usgs.gov/ogw/cfp/cfp.htm

MODFLOW-LGR

MODFLOW-LGR is a version of MODFLOW-2005 with local grid refinement.
(Version 1.1.1 released April 2008)
http://water.usgs.gov/nrp/gwsoftware/modflow2005_lgr/mflgr.html

GSFLOW: Ground-Water and Surface-Water Flow Model

GSFLOW is a coupled groundwater and surface-water flow model based on the USGS Precipitation-Runoff Modeling System (PRMS) and MODFLOW-2005.
(Version 1.0.00 released March 2008)
http://water.usgs.gov/nrp/gwsoftware/gsflow/gsflow.html

SEAWAT: 3D Variable-Density Ground-Water Flow and Transport

SEAWAT is a generic MODFLOW/MT3DMS-based computer program designed to simulate three-dimensional variable-density groundwater flow coupled with multi-species solute and heat transport.
(Version 4 Released March 2008)
http://water.usgs.gov/ogw/seawat/

For More Information:

For more information or to download software and supporting documentation, visit USGS Groundwater Software.