Input data requirements are given in the user manual and at http://www.per.clw.csiro.au/topog/ All inputs are as ASCII files that can be prepared with normal text editors and utility programs.

Most output is in ASCII files that can be viewed and anlysed with specifically designed tools included in the package, or with regular graphics and analysis tools.

Topog is a complex modelling tool that requires a knowledge of computing and a good understanding of catchment and hillslope hydrology, although the catchment model itself, and many of the tools, will work on any computer for which you have Fortran and C compilers. It requires a significant time investment for installation and familiarisation. Compilation of the package often requires modification to C and Fortran "make files", and may require "administrator" privileges on your computer.