                                                           File:   UPDATE.TXT


                   PLUMES Model System Update Notes

            Center for Exposure Assessment Modeling (CEAM)
            U.S. Environmental Protection Agency (U.S. EPA)
               Office of Research and Development (ORD)
            Athens Environmental Research Laboratory (AERL)
                       960 College Station Road
                      Athens, Georgia 30605-2700

                             706/546-3549



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The following are explanations of changes in the PLUMES modeling system since
the publication of the user's manual files for the third edition, Dilution
Models for Effluent Discharges (June 1994).  A brief explanation and/or
example may be given for each change/enhancement.

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Changes
~~~~~~~
Date: 11 August 1994

NOTE:  The comments in the source code on page 154 of the PLUMES Third
Edition give the impression that dxpipe and dzpipe are the horizontal length
of the section and the vertical rise of the section respectively.  That is
not the case.  The text on page 153 is clearer.  In any case, the spacing and
rise refer to distances measured between ports.  Refer to file GUIDE.WP4 in
the DOCUMENT sub-directory.

Also, on page 39, PLUMEPRO should be ED3PRO, and the new program is 3PLUMES,
not PLUMES.  If you wish you may rename these files to go along with the
earlier convention.  Refer to file GUIDE.WP1 in the DOCUMENT sub-directory.

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