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

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Abstract: The modular finite-difference ground-water flow model (MODFLOW) developed by
the U.S. Geological Survey (USGS) is a computer program for simulating common
features in ground-water systems. MODFLOW can be applied as a one-dimensional,
two-dimensional, or quasi-or full three-dimensional model. The modular program
design of MODFLOW allows for new simulation features to be added.

MODFLOW is ... View entire text
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Description: Several versions of MODFLOW have been released. The original version is
referred to as MODFLOW-88. MODFLOW-96 contains a variety of enhancements. The
most visible enhancements involve data input. MODFLOW-2000 is a major update
that fully integrates parameter estimation.
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Service Citation
Originators: McDonald, M.G., and Harbaugh, A.W.
Provider: U.S. Geological Survey
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. ... View entire text
Ancillary Keywords
water levels
water budget
flow rates

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
Distribution Media
Distribution_Media: electronic or ftp
Distribution_Size: 590K to 853K depending on platform
Distribution_Format: self extracting DOS executable or UNIX tar file
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
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.
Creation and Review Dates
SERF Creation Date: 1999-10-13
SERF Last Revision Date: 2008-05-29
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