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Disclaimer
Although every effort is made … Disclaimer</br></br>Although every effort is made to provide timely and accurate information, the authors, the U.S. Geological Survey (USGS), and the U.S. Government make no warranty, expressed or implied, as to the timeliness or accuracy of the contents of this web site, which may be updated and revised at any time. Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Any links to non-Government web sites are provided for convenience only and do not imply endorsement by the U.S. Government. imply endorsement by the U.S. Government. +
United States +
U.S. Geological Survey +
431 National Center +
20192 +
Virginia +
Model developer +
No but possible +
No but possible +
No but possible +
Creation date"Creation date" is a predefined property that corresponds to the date of the first revision of a subject and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
15:29:23, 10 November 2009 +
Test data sets are provided to verify that MODFLOW-2000 is correctly installed and running on the system. The tests may also be looked at as examples of how to use the program. +
Too many to mention here, see:
http://water.usgs.gov/nrp/gwsoftware/modflow2000/modflow2000.html +
Too many to mention here, see:
http://water.usgs.gov/nrp/gwsoftware/modflow2000/modflow2000.html +
The ground-water flow equation is solved u … The ground-water flow equation is solved using the finite-difference approximation. The flow region is subdivided into blocks in which the medium properties are assumed to be uniform. In plan view the blocks are made from a grid of mutually perpendicular lines that may be variably spaced. Model layers can have varying thickness. A flow equation is written for each block, called a cell. Several solvers are provided for solving the resulting matrix problem; the user can choose the best solver for the particular problem. Flow-rate and cumulative-volume balances from each type of inflow and outflow are computed for each time step.d outflow are computed for each time step. +
Active +
MODFLOW is a three-dimensional finite-diff … MODFLOW is a three-dimensional finite-difference ground-water model that was first published in 1984. 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 00-92 (complete reference below) documents a general update to MODFLOW, which is called MODFLOW-2000 in order to distinguish it from earlier versions.</br></br>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.</br></br>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.solute transport and parameter estimation. +
Paul +
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1.96 +
modflow +, model +, three-dimensional finite-difference ground-water +, three-dimensional finite-difference +, flow +, finite-difference ground-water model +, finite-difference ground-water +, ground-water flow +, ground-water +, boundary +, head +, geological survey +, three-dimensional +, finite-difference +, published + and basins +
As code +
Please send comments and corrections to Richard B. Winston (rbwinst@usgs.gov). +
basins +
Modular +
http://water.usgs.gov/nrp/gwsoftware/modflow2000/MFDOC/index.html +
Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a target="_blank" rel="nofollow noreferrer noopener" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.
02:16:36, 17 September 2020 +
3042 +
MODFLOW is a three-dimensional finite-difference ground-water model +
431 National Center +
20192 +
false +
false +
Other +
Non-commercial MODFLOW versions are free, however, their licensing usually limit the use to non-profit educational or research purposes. +
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Through web repository +
http://water.usgs.gov/nrp/gwsoftware/modflow2000/modflow2000.html +
Watershed-Scale +
1984 +
Model developer +
