USGS home page


Two-dimensional method-of-characteristics ground-water flow and transport model

References to commercial vendors of software products or services are provided solely for the convenience of users when obtaining or using USGS software. Such references do not imply any endorsement by the U.S. Government.


Summary of MOC
Version history


UNIX, DOS, or Macintosh installation instructions (README file)
Download MOC for:
DOS (self-extracting PC zip file)
Sun (Gzip/tar file)
Silicon Graphics (Gzip/tar file)
Macintosh (BinHex self-extracting file)
Source code only for Sun (Gzip/tar file)

The Free Software Foundation's gunzip is necessary to uncompress the UNIX tar file
available above. 

Aladdin Systems' Stuffit Expander, a freeware product, is necessary to decode the Macintosh distribution file above.


USGS WRIR 94-4115, Portable Document Format (PDF) (3.6MB)

Konikow, L.F., Granato, G.E., and Hornberger, G.Z., 1994, User's guide to revised method-of-characteristics solute-transport model (MOC--Version 3.1): U.S. Geological Survey Water-Resources Investigations Report 94-4115, 63 p.
USGS TWRI Book 7, Chapter C2, Portable Document Format (PDF) (6.2MB)

Konikow, L.F., and Bredehoeft, J.D., 1978, Computer model of two-dimensional solute transport and dispersion in ground water:  U.S. Geological Survey Techniques of Water-Resources Investigations, book 7, chap. C2, 90 p.

Please note that some U.S. Geological Survey (USGS) information accessed through this page may be preliminary in nature and presented prior to final review and approval by the Director of the USGS. This information is provided with the understanding that it is not guaranteed to be correct or complete and conclusions drawn from such information are the sole responsibility of the user.
USGS Privacy statement
USGS Disclaimer statement

Web page comments, contact: George Z. Hornberger <gz>
U.S. Geological Survey
431 National Center
Reston, VA 20192

Last Iteration: March 2, 2006