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

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Summary

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 ...

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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.

Link: GET SERVICE > GET SOFTWARE PACKAGE

Description: MODFLOW-2000 simulates steady and nonsteady flow in an irregularly shaped flow
system in which aquifer layers can be confined, unconfined, or a combination of
confined and unconfined. Flow from external stresses, such as flow to wells,
areal recharge, evapotranspiration, flow to drains, and flow through river
beds, can be simulated. Hydraulic conductivities or transmissivities for any
layer may differ spatially and be anisotropic (restricted to having the
principal directions aligned with the grid axes), and the storage coefficient
may be heterogeneous. Specified head and specified flux boundaries can be
simulated as can a head dependent flux across the model's outer boundary that
allows water to be supplied to a boundary block in the modeled area at a rate
proportional to the current head difference between a "source" of water outside
the modeled area and the boundary block. MODFLOW is currently the most used
numerical model in the U.S. Geological Survey for ground- water flow problems.

In addition to simulating ground-water flow, the scope of MODFLOW-2000 has been
expanded to incorporate related capabilities such as solute transport and
parameter estimation.

Link: GET SERVICE > GET SOFTWARE PACKAGE

Description: MODFLOW is a three-dimensional finite-difference ground- water flow model. It
has a modular structure that allows it to be easily modified to adapt the code
for a particular application. Many new capabilities have been added to the
original model. OFR 96-485 (complete reference below) documents a general
update to MODFLOW, which is called MODFLOW-96 in order to distinguish it from
earlier versions.

Link: GET SERVICE > GET SOFTWARE PACKAGE

Description: MODFLOW is a three-dimensional finite-difference ground-water flow model. It
has a modular structure that allows it to be easily modified to adapt the code
for a particular application. Many new capabilities have been added to the
original model. This version includes all the major capabilities that were
documented as of September 1996.

Service Citation

Originators: McDonald, M.G., and Harbaugh, A.W.
Title: MODFLOW
Provider: U.S. Geological Survey
URL: http://water.usgs.gov/nrp/gwsoftware/modflow.html

Service Keywords

MODELS >COMPONENT PROCESS MODELS

Science Keywords

TERRESTRIAL HYDROSPHERE >GROUND WATER >GROUND WATER DISCHARGE/FLOW

ISO Topic Category

GEOSCIENTIFIC INFORMATION

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. ...

Ancillary Keywords

aquifer
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

Service Organization URL: http://water.usgs.gov/software/ground_water.html

Service Provider Personnel
Name: WATER WEBSERVER TEAM - USGS Phone: 703-648-4000;1-800-426-9000 Email: h2oteam at usgs.gov 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

Personnel

TYLER B. STEVENS
Role: SERF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

Publications/References

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
p.

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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