The irriapps project was born in Mexico, and some tools (like this) are clearly focused in the Mexican engineering. This time a command line program for calculating the runoff coefficient was developed. This little python script uses the Mexican Norm NOM-011-CONAGUA-2015 methodology.
If you are interested in this tool, please feel free to download and use it as you wish. Just remember that some tools are under development. Although this script is old and was tested by some users, it may have errors and bugs.