CATTI is a program for the interpretation of tracer test data. It computes: 1) breakthrough curves of tracers in observation wells if the aquifer parameters are known; or 2) it estimates the aquifer parameters (e.g., longitudinal and transverse dispersivity) from a measured breakthrough curve. The program assumes a homogeneous, horizontally infinite aquifer with either one-dimensional or two-dimensional uniform flow or radial flow. The aquifer may consist of one or two layers. The injection of the tracer can be continuous or instantaneous. Besides manual interpretation by trial and error, CATTI provides an option for automatic parameter identification by non-linear least squares estimation methods. CATTI is a menu-driven interactive program which allows modification of transport parameters. Input is from the keyboard, or from external files prepared during previous runs of CATTI. The program output provides immediate visualization of breakthrough curves via graphic screen output, and can be saved as a HPGL graphics file. CATTI is a proprietary program which runs under MS-DOS. Distribution disks contain source code and executable image. The user's manual includes theory, input instructions, and example problems.

SYSTEM REQUIREMENTS

Intel 80i86 based computer, 640 Kb RAM, math coprocessor, about 1 Mb free disk space, DOS 3.1 or higher, and CGA, EGA or VGA graphics

Developers: J.P. Sauty (BRGM) and W. Kinzelbach (University of Kassel)