GROUND WATER--Updates to SWIP (INTERA) Model for Solute Transport UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY RESTON, VA. 22092 In Reply Refer To: October 26, 1982 Mail Stop 411 GROUND WATER BRANCH TECHNICAL MEMORANDUM NO. 83.01 Subject: GROUND WATER--Updates to SWIP (INTERA) Model for Solute Transport During the past 3 years, several errors in the 1979 version of the SWIP (or INTERA) solute and heat transport code have been discovered. The errors range from trivial typographical errors to major revisions in the PROD and PRINT2 subroutines in order to enable the option of wells providing constant-pressure boundary conditions to perform correctly. This memorandum is to inform users of this model that a detailed memorandum listing the errors and the changes needed to correct them is available from Ken Kipp, MS 413, Denver Federal Center. Also, if users become aware of other errors in the code, or the appropriate corrections, please let Ken know so that he can update his master listing. (s) Eugene P. Patten Acting Chief, Ground Water Branch WRD Distribution: A, B, S, FOL, PO