USGS Groundwater Information
New & Noteworthy
USGS Groundwater Watch
USGS maintains a network of active wells to provide basic statistics about groundwater levels.
USGS in Your State
USGS Water Science Centers are located in each state.
Other USGS Water Science Areas
Legacy and Superseded MODFLOW Versions and Utilities
The following software applications are not actively supported by the USGS. Applications listed below have been categorized as one of the following:
The software is provided online for historical reference only, and the pages may contain outdated information or broken links.
MODFLOW-2000 (v.1.19.01, March 25, 2010) is a superseded version of the core MODFLOW program. MODFLOW-2000 has been superseded by MODFLOW-2005.
MODFLOW-96 is a superseded version of the core MODFLOW program. MODFLOW-96 has been superseded by MODFLOW-2005. Two versions of MODFLOW-96 are available online:
MODFLOW-88 (v.2.6, September 20, 1996) is a superseded version of the core MODFLOW program. MODFLOW-88 has been superseded by MODFLOW-2005.
MF2K-FMP is a MODFLOW-2000-based program that simulates supply-and-demand components of irrigated agriculture. MF2K-FMP is superseded by MF2005-FMP2.
MFI2K is a data input program for MODFLOW-2000. MFI2K is replaced by replaced by MFI2005.
MFI is a text-based data input for MODFLOW-96. MFI is replaced by replaced by MFI2005.
AIR3D is legacy variant of MODFLOW to simulate air flow in a heterogeneous, anisotropic, unsaturated zone where air flow is induced through dry wells or trenches, as in vapor-extraction remediation.
MODBRNCH is a legacy Groundwater/Surface-Water Coupled Flow Model using MODFLOW and BRANCH Models.
MODFLOW/DAFLOW is a legacy integrated surface-water/groundwater model.
MODFLOWP is a legacy variant of MODFLOW-96 with parameter-estimation.
MODOPTIM is a legacy general optimization program based on MODFLOW-96 for groundwater-flow model calibration.
RADMOD is a legacy preprocessor for MODFLOW-96 to simulate axisymmetric problems.
VSF is a legacy variant of MODFLOW with the added capability to simulate variably saturated flow.