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EPS

If I do an EPS and then decide to annotate the pipes and junctions with respective pressures and nodes, is there a way to identify which time step of the EPS is being displayed? I have a hard time understanding the results on the model itself. My summary is all green and everything is balanced per the results but if I try to get the system annotate everything the numbers are not what I expected. The same question applies for the Flex tables. I'm having trouble understanding what time step is showing up in the flex tables. I'm new to watergems and just need some help interpreting the results.

Parents
  • Yusuf Rashid,

    First, make sure the Auto Refresh option is selected (has a checkmark beside it) in View - Refresh.  This Wiki article contains more information.

    The results are probably reflecting the first timestep before water begins to flow through the system.  See this Wiki article for instructions on how to look at certain time steps.

    Also, as a new user, you might find the following article to be a good resource - Learning Resource Guide for new users of Bentley WaterGEMS and WaterCAD.

    Please let us know if you need more information or if you have trouble with any of the links provided.

    Thank-you,
    Larry

  • Thank you for this. It was definitely helpful. I definitely feel like I've gotten further than I was when I sent the message earlier but still having some trouble. If I understand this correctly, demand patterns represent the 'fixed demand' with multipliers for whatever time of day (i.e. 1 GPM with a 1.6 multiplier would be 1.6 GPM) then shouldn't I see that in the results? I understand you don't have my model in front of you but what I'm struggling with is that everytime I go to graph a demand for a junction, the junction graph over a 24 hr period is considerably different than what I expected it to be. My fixed demand is let's say 10 GPM and well it never even gets to 10 GPM? Is it saying my pumps can't handle the demand? 

  • The graph in your previous reply seems to be the flow in a pipe, not the calculated demand. Where is this pipe in relation to the demand? (is the demand at a dead-end, and this is the pipe upstream of it?)

    Can you graph the calculated demand at that node in question, or move the Time Browser to hour 15 and provide a screenshot of the Results section of the properties where the calculated demand is shown?

    Are you certain that you're looking at the correct pattern assigned to that node, that you you're computing the correct scenario and that you're looking at the calculation options assigned to that scenario?

    Do you have pressure dependent demands applied?

    Beyond this, it would be more efficient to obtain a copy of the model, or perhaps a cut-down/simplified version that demonstrates the problem.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

  • The pipe is the only pipe feeding that demand node (pipe upstream of demand location). Junction has no pipes downstream of it. I think these are the pictures you are looking for. I do not have any pressure dependent demands.

  • Thanks - some follow-up questions for you:

    1) The calculation options screenshot does not include the Pressure Dependent demand option near the bottom - can you confirm that PDD is not enabled? (this would adjust demands based on pressure).

    2) The screenshots seem to be showing the scenario named "Base" (note the red check mark next to "base". Are you sure that this is the scenario you are computing when observing the results in question? 

    3) Do either of those two other calculation option sets have a demand adjustment applied? (in case maybe they are assigned to the scenario you're looking at)

    4) Even though the "Demand Adjustment" calculation option indicates "None", does it have any effect if you switch this to use a global multiplier of 1.0? (then re-compute the model)

    5) What version of WaterGEMS are you using? You can find this under File > Help > About. The latest is 10.03.01.08. Although it is unlikely that this would matter, if you are using an older version, it may be best to try upgrading.

    Again, it would be much easier for us to determine the cause of this problem if we could see the model, or a simplified version that demonstrates the problem.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

  • 1) I checked all my calculation options and none of them have PDD on. All say False.

    2) I checked it again and re-computed just to make sure and it is running the Base calculation.

    3) None of the other calculation options have demand adjustments applied. 

    4) I recomputed the calculation with a multiple 1.0. Results in the picture below for our junction from before.

    5) Watergems version in the picture below.

    Do you ever use Microsoft Teams with Customers? If there's a way for me to set up a meeting with you on Teams and I can show you the model that way I think that would be best. 

  • Can you please also include a screenshot showing the Demand Collection for this particular junction, showing the base demand and pattern name?


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

Reply Children
  • Thanks for the extra screenshots. I assume the top-left shows the demand collection for the junction in question.

    Please check the "Daily Factors" and "Monthly Factors" tabs in the demand pattern to make sure they are not set to 0.1 (the calculated demands you're showing appear to be one tenth of what they should be based on the hourly pattern multipliers).

    If this does not help, can you simplify the model down to one pipe for example (reservoir > pipe > junction in question) and remove any other library components, and send a copy of that using the private method mentioned in this article?

    If that is not possible, please send me a private message with your company information ("Site ID" found under File > Help > About) so that I can open a Service Request for this and try to schedule a meeting if your company has a SELECT or ELS subscription. I was not able to locate your company based on your Communities account email address.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

  • Thank you!! This fixed it! Apparently my Saturday and Sunday multipliers were set to 0.1. I changed them back to 1.0 and everything appears to be running how it should now. Funny how the smallest things can create such tedious problems. Is there a way to check the internal clock in the program? 

    I will send you a private message with our Site information. I do believe we have a Select account.

  • Great. I have added this to the related article: Calculated demand does not match entered demand


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.