The purpose of this technote is to discuss how to use Darwin Calibrator to perform Leakage Detection.
Leak detection works by adjusting the emitter coefficient (a pressure dependent demand) at nodes in order to get the model to match the field data. A Genetic Algorithm is used and you can find more details about the underlying methodology in the Help documentation, such as the topics entitled "Competent Genetic Algorithms".
Note : Along with this technote you will find attached model used to explain Leakage Detection Using Darwin Calibrator & the input data files using Excel Format.
As an introduction to water loss management, it is advisable that you read the following article before embarking on a leakage detection study: Tips for Water Loss Management and Leak Detection
The following videos are available to help you learn how to perform leak detection:
(quick overview) Locate sources of non-revenue water usage with Darwin Calibrator in WaterGEMS
(training workshop) WaterGEMS Advanced Part 14: Workshop 7 (Leakage detection)
Observing leakage over the time with the help of graph using the attached model for a particular element:
For this example we have field data of flow through pipe P-13, which we will compare with the model results. (See attached model)
The graph shows the actual flow for Pipe P-13 at various time steps & the observed flow on the field. With the help of this graph you can visualize the leakage at the determined locations, by using the actual flow in the model Vs. observed flow on the field. The difference between the actual flow and the observed flow is the leaked flow into the system.
Calibrating the model to observe the leaks in the model
Go to Analysis>Darwin Calibrator>Create new Calibration Study>Rename it as Leakage Study.
Preparing data for importing the field data snapshots
There are several ways of importing the field data into Darwin Calibrator.
You need to have SCADA element present in the model for importing SCADA data.
2. Using other file formats as
Example of data format required using Microsoft Excel
Please follow the steps in the below article to import snapshots and observed targets from an Excel spreadsheet using ModelBuilder:
Importing Darwin Calibrator Field Data using ModelBuilder
Setting up calibrator study for leakage detection
To prepare, first go to the Demand Groups tab to create a group of demands>create new>Select edit button from Element IDs column>select elements from drawing.You can create multiple demand groups as per different pressure zones/Material groups/Diameter groups in the model. ( Please see technote of Darwin Calibrator to know how to create demand groups)
Note: You can change the emitter coefficient values as per the amount of leakage.
Viewing the results using Element Symbology
Locate sources of non-revenue water usage with Darwin Calibrator in WaterGEMS
Model for leak det technote.zip