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Subtype: GET SOFTWARE PACKAGE
Link: http://water.usgs.gov/nrp/gwsoftware/modflow2000/modflow2000.html
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.

Subtype: GET SOFTWARE PACKAGE
Link: http://water.usgs.gov/software/modflow-96.html
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.

Subtype: GET SOFTWARE PACKAGE
Link: http://water.usgs.gov/software/modflow-88.html
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.

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