Search Help
MODFLOW - the Modular Three-Dimensional Finite-Difference Ground-Water Flow Model
Entry ID: modflow-99

This description is a member of a collection.
Click to see members of this collection.
Abstract: The modular finite-difference ground-water flow model (MODFLOW) is the USGS's modular hydrologic model. MODFLOW is considered an international standard for simulating and predicting groundwater conditions and groundwater/surface-water interactions.

Originally developed and released solely as a groundwater-flow simulation code when first published in 1984, MODFLOW's modular structure has provided a robust framework for integration of additional simulation capabilities that build on and enhance its original scope. The family of MODFLOW-related programs now includes capabilities to simulate coupled groundwater/surface-water systems, solute transport, variable-density flow (including saltwater), aquifer-system compaction and land subsidence, parameter estimation, and groundwater management.
Related URL
Description: MODFLOW project homepage.

Description: Download the MODFLOW software.
Service Citation
Edition: 6
Service Keywords

ISO Topic Category
Quality Modflow is best suited for higher education students, scientists and professionals seeking a utility to model ground water flow.
Use Constraints In order to use MODFLOW, initial conditions, hydraulic properties, and stresses must be specified for every model cell in the finite-difference grid. MODFLOW-96 is written in Fortran 77 with the following extension: use of variable names longer than 6 characters. By default, the software is dimensioned for use with models having up to 90,000 cells. MODFLOW-96 requires that file names needed for ... View entire text
Service Provider
DOI/USGS/WRD/SW/GW > Ground Water, Software, Water Resources Division, U.S. Geological Survey, U.S. Department of the Interior Supplemental Info
Service Organization URL:

Service Provider Personnel
Phone: 703-648-4000;1-800-426-9000
Email: h2oteam at
Contact Address:
USGS National Center
Water Resources Division
12201 Sunrise Valley Drive
City: Reston
Province or State: VA
Postal Code: 20192-0002
Country: USA
Phone: 301-851-8113
Email: Tyler.B.Stevens at
Contact Address:
5700 Rivertech Court
City: Riverdale
Province or State: MD
Postal Code: 20737
Country: USA
Belitz, K., and Phillips, S.P., 1993, Numerical simulation of
ground-water flow in the central part of the western San Joaquin
Valley, California: U.S. Geological Survey Water-Supply Paper 2396, 69

Prince, K.R., Franke, O.L., and Reilly, T.E., 1988, Quantitative
assessment of the shallow ground-water flow system associated with
Connetquot Brook, Long Island, New York: U.S. Geological Survey
Water-Supply Paper 2309, 28 p.
Extended Metadata Properties
(Click to view more)

Creation and Review Dates
SERF Creation Date: 1999-10-13
SERF Last Revision Date: 2018-01-22