![how to get headloss from water cad how to get headloss from water cad](https://upload.wikimedia.org/wikipedia/commons/5/55/EPANET.gif)
If you open up the file, you will see that the model will run with CU4 valve 2, but I get an error message if I try using CU5 valve 2. I already have demand on various nodes in the system corresponding to REU tables based on building type - are you suggesting to put a small demand at one of the hydrants? I am using demand at hydrants to calibrate the model, from hydrant flow tests. I have demand with all three hydrants off, yes. RE: EPANET System Unbalanced hydrae (Mechanical) 8 Sep 17 14:36 If anyone has any tips, I would be extremely grateful! I can not figure out why this is happening for the life of me, and would really appreciate some input. However, when I place demand on any one hydrant, the model runs fine. When I place no demand on any hydrant and run the model, I get an error message saying that the system is unbalanced at 0+00 hours. There are three hydrant flow tests I am using to calibrate my system.
![how to get headloss from water cad how to get headloss from water cad](https://media.cheggcdn.com/media/cad/cad8dd67-c94f-45e0-98f1-6e426a1ccf6b/phpubnwg8.png)
There are two double check valves/back flow preventers at the beginning of the system that I am modeling as a GPV with a head loss curve. I am using a tank as the supply to the system, and adding nodes to respective locations to add demand to buildings in the University. I am modeling the existing water system for a University in West Michigan. I'm new to this forum, but am struggling with an error message I am receiving in EPANET.