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Accessing the efficiency and accuracy of WaterGEMS in Darwin calibrator for leakage detection

Hello All,

As discussed in my last question that was asked under Leakage detection, I have generated the artificial data in EPANET and I have carried out leakage detection. These artificial data were prepared in an excel file and imported into Darwin Calibrator for Leakage detection. Now I have to determine how accurate and efficient WaterGEMS is for leakage detection. I am a bit confused about how to go about it. Is it that am going to use these imported data into Darwin Calibrator to perform the analysis or I will have to input an emitter coefficient in WaterGEMS at the selected nodes where the emitter coefficients were input using EPANET and compare these pressure and flow results from WaterGEMS to the artificial data prepare in EPANET? Please I need your help.

Thanks.

Best regards 

Millicent.

  • Hello Millicent, 

    For leakage detection, you need to input an emitter coefficient in Darwin calibrator setup not at all nodes in the WaterGEMS model. First you would compute the WaterGEMS model successfully and then import external field data (excel data you have) in Darwin Calibrator to run leak detection case study.

    In leak detection study in calibrator specify emitter coefficient values and compute the study and observe differences in values. Then export the leak detection results in WaterGEMS model to highlight the leak nodes. 

    Step by step information about performing leak detection using Darwin Calibrator is mentioned below, please go through it. 

    Performing Leakage Detection Using Darwin Calibrator 

    Regards,

    Sushma Choure

    Bentley Technical Suppport

  • Hello Sushma Choure,

    I have entered the emitter coefficient in Darwin Calibrator but am having a user notification warning of "Must have at least one observed field data value''. I also tried to import the observed data in Darwin Calibrator and input an emitter coefficient and i compute the model, but no value for adjusted emitter coefficient and the original emitter coefficient after computing the mode. So should I import the observed data in Darwin Calibrator to determine the accuracy and efficiency of waterGEMS or the observed data should only be imported in Darwin Calibrator to carry out leakage detection?

  • Hello Millicent, 

    To perform leak detection you need observed field data values to compare those with model values, so you get warning when there are no observed field data values entered / imported in Calibrator. Check if you have entered data correctly in calibrator if you are not getting desired results using emitter coefficient values. Go through example 8 located at C:\Program Files (x86)\Bentley\WaterGEMS\Samples, which is an example of Darwin calibration, leak detection, so you will get an idea about it. 

    Darwin Calibrator is adjusting roughness's so that accurate pressures, velocities, and flows are available in the model run (When you compute a WaterGEMS model, the demands will always be satisfied). If the model is not calibrated, attributes like pressure, velocity, and flow and other attributes may not be representative since the true roughness in a set of pipes may be different from the values entered in the model. For that purpose you can use Darwin Calibrator, observed field data is generally imported in Darwin Calibrator, so you can compare that with model data and look out for discrepancies. . 

    Below are some useful links for you to perform and understand calibration process. 

    Water Model Calibration Tips 

    Using Darwin Calibrator 

    How do I match the results I am getting from Darwin Calibrator in my model? 

    Regards,

    Sushma Choure

    Bentley Technical Suppport

  • Hello Sushma Choure, 

    Thanks so much for the response. I have done as you said and it's okay now. 

    Best regards,
    Millicent.