TM-6A30__hirez - Revised Multi-Node Well(MNW2 Package for...

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U.S. Department of the Interior U.S. Geological Survey Techniques and Methods 6–A30 Revised Multi-Node Well (MNW2) Package for MODFLOW Ground-Water Flow Model
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Cover: Schematic cross section showing flow patterns that can be induced by well that is open to multiple aquifers (see figure 1 and related discussion for more details); modified from Halford and Hanson (2002).
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Revised Multi-Node Well (MNW2) Package for MODFLOW Ground-Water Flow Model By Leonard F. Konikow, George Z. Hornberger, Keith J. Halford, and Randall T. Hanson With a section by Arlen W. Harbaugh Techniques and Methods 6–A30 U.S. Department of the Interior U.S. Geological Survey
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U.S. Department of the Interior KEN SALAZAR, Secretary U.S. Geological Survey Suzette M. Kimball, Acting Director U.S. Geological Survey, Reston, Virginia: 2009 For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1–888–ASK–USGS For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit http://store.usgs.gov Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted materials contained within this report. Suggested citation: Konikow, L.F., Hornberger, G.Z., Halford, K.J., and Hanson, R.T., 2009, Revised multi-node well (MNW2) package for MODFLOW ground-water flow model: U.S. Geological Survey Techniques and Methods 6–A30, 67 p. ISBN 978–1–4113–2488–6
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iii Preface This report describes a software package to allow the U.S. Geological Survey (USGS) MODFLOW ground-water flow model to simulate “long” wells that are connected to more than one node of the finite-difference grid. The software represents a revision to a previously published Multi-Node Well Package and is meant to replace the previous version. The modi- fications allow corrections for the effects of partially penetrating wells, improved treatment of non-vertical wells, and adjustments in discharge according to specified pump performance (head-capacity) curves, among other changes. Sample problems are included throughout the text. The revised code is compatible with MODFLOW–2000 and MODFLOW–2005. In this report, any program variables, computer file names, input listings, and output files are printed in a nonproportional (or fixed width) font (for example, sample parameter ). This helps clearly distinguish the nature and origin of these terms and items. The code and documentation, including files for the sample test problem, are avail- able for downloading at no cost on the Internet from a USGS software repository at http://water.usgs.gov/software/ground_water.html . When this code is revised or updated in the future, new versions or releases will be made available for downloading from this site.
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