In the Storm Water Model (SewerGEMS) I got spikes in the EGL; how these spikes formed? and why? is there any impact of these spikes? if yes; what should I do?
Here is the screenshot of what I am talking about:
OpenFlows | Water Infrastructure Forum - Spikes at the Energy Grade Line
Thanks for sending the files.
The problem is that, when there is a second incoming pipe at a higher elevation, the EGL in from that pipe can be higher than the EGL in from the other incoming pipe. Since there's only one EGL in result field for the node, it ends up displaying the one from the tributary pipe and the profile ends up looking strange like the screenshot in question.
You could consider this to be a reporting quirk; the results should be OK. I was able to get the profile appearance to look a bit better using a virtual flow depth of 0.005 m, but this only contained the "spike" within the node instead of across the pipe.
I will discuss this with our developers to see if there is a creative solution to be considered for a future release and if so, I will open a Service Request on your behalf and link it to the related enhancement number.
Update: for reference, this is being considered via Enhancement # 890313
Update: new Wiki article: Spike in EGL in profile view when lateral pipes connect at a higher elevation