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Modeling Intermitent water flow

I am modeling water supply in my Community. The supply is rashened due to demand outmatches supply.

I need to calibrate such a system and I am faced with challenge, since supply in nt to the entire network at atime but rather to sections.

Please I need help:

1) How to model such supply system ( I intedned to put flow control valves at certain locations and put cammand on when to open and Close but this is becoming a challenge) Kindly update me with proceedure to write the commands, if any or any other approach to achieve my objective.

2) On how to use the Dawin calibrator to work in this case,

Thank you

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  • Hi Henry,

    Since you mention you only supply one section at a time, why don't you model each "Zone" as its own unique system? Simplistic drawing below:

    Mock up simple intermittent system

    You could do this by using "Active Topology" in the software and end up with a scenario per zone. That way, you could calibrate each of the "zones" with the data that you have collected at the time that "zone" was open? Tom asks a very good question about individual house tanks because here in the developing world, we use them a lot and that completely changes the demand patterns. (Once you "open" a zone, you will have a constant demand until the tanks are full.

    What do you intend to do with your model once it is fully calibrated?

  • Thank Angela for your support.

    I intend to use the model in water leakage detection. This forms part of my thesis in school.

    One twist to my work is that, supply is not on 24/7 basis. Water supply is for only 14hours duration, apart from it being supplied in "Zones".

    I changed the period of stimulation to 120hours to cover for all the 5 Zones and here again, I am having results for periods where there was no supply in the systems.

    Please do you have any suggestion for a way out or a further explanation for a better understanding.

    I am actually new to water modeling but I would like to be a great water system and I would appreciate your support in that regards

    Thank you

  • If water loss is your focus, check out this brochure.

    https://www.bentley.com/en/search?q=water loss

  • Hi Henry,

    Would you be able to share your model so we can see what the setup is like?

    One thing to remember when throttling flow control valves (FCVs) is that the model will always meet the demands that you have entered. Regardless of FCVs settings.  For example, if the total demand in the system is 10MGD, the model will supply those 10MGDs even when the FCVs are throttling. Calculated pressures will probably be very low (even negative) because you have now added headlosses at the FCVs.  So, if your intention is to figure out actual demands at lower pressures you need to use FCVs and pressure dependent demands.  

  • Henry, the following wiki articles may be of interest to you:

    Modeling Fixed Inflow from a Marginal Source

    Modeling intermittent water supply


    Regards,

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

  • Thank you Jesse, I will study them.

    Henry, 

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