Epanet-system disconnected error report 2

[dejan83]

Hello to everyone... I'm relatively new to Epanet modeling and have a problem... Probably, this question has been asked a hundred times before, but i hope i'm not bothering you...

After making the model and running hydraulics analysis, there is next error report:

-negative pressures at ----hrs
-negative pressures at ----hrs
-...
Ok, that's what i do understand about model, and i corrected it by increasing pipe diameters, but this part of the report:

-negative pressures at 20:01:47 hrs.
-node---is disconnected at 20:01:47 hrs
-node---is disconnected at 20:01:47 hrs
-...
-30 additional nodes are disconnected at 20:01:47 hrs
-system disconected because of link 1???

Ok... I read on the forum, maybe there was some closed link - but there was not... Also something like: there is no way to deliver asked demand to the node...
But how to solve the problem? (Probably, problem is the tank...??)

Between, link 1 is the pipe that connects tank and the 1st node on the network...

Thanks to everyone no matter what you write...

 

[hydrae]

the storage tank goes empty at the time specified,
that would disconnect the nodes uphill and negative pressures

Hydrae

 

[dejan83]

Thanks for answering... It seams reasonable... According to that, I just made the storage tank diameter increased, and the problem was gone.

I also hope that's a reasonable solution...?

Thanks...

 

[hydrae]

Or add controls to engage more supply,
the goal is to simulate the real world, what does the system do when that tank level drops?

Hydrae

 

[dejan83]

Ok... Then different pump setings I assume...
Also, I found there is no need to increase storage tank diameter - initial level only...

Like I siad, I'm relatively new to Epanet modeling, so, once more, I hope I'm not bothering you...

This is the final model... Thanks Hydrae...

 

[RH27]

I made some very introductory level video tutorials on setting up an EPAnet model. Feel free to see if anything on them helps:

http://www.youtube.com/watch?v=Ac36MoQFqzw

 

[dejan83]

Thanks RH27... All these video tutorials are very helpful.
Best regards...