Crapper

Crapper is intended as a tool to help proffessionals to design water suply systems with the Hunter Method. It can calculate friction and local healosses and automatically sets K for direction changes were are needed. Crapper can calculate pressure an flow at the supply point of a water supply system using the Hunter Method, fixture units. Results can be saved in a csv file and you can prepare your own files to be readed by Crapper and then calculated the system. There are no limit on nodes and pipes.
You can see a short tutorial here: https://www.youtube.com/watch?v=WvZfEMlcXqU
And enable subtitles for a better understanding.