World Environmental and Water Resources Congress 2019
The Impact of Hydraulic Model Calibration on Model-Based Leak Localization Accuracy: Conclusions Drawn from a Real-World Case Study
Publication: World Environmental and Water Resources Congress 2019: Hydraulics, Waterways, and Water Distribution Systems Analysis
ABSTRACT
This study examines the influence of the quality of hydraulic model calibration on the accuracy of model-based leak localization. It is based on a real-world case study where pressures were measured at 12 positions for more than 4 months. Fire flow tests were performed to obtain calibration data— artificially generated leaks with different sizes between 0.25 l/s to 1 l/s at 4 different positions served as dataset for model-based leak localization. Three different calibration approaches were applied on an uncalibrated model generated from GIS data: (i) height adjustments of measurement positions through detailed analysis of long term pressure signals in the leak-free system; as well as (ii) manual trial and error calibration; and (iii) automatic calibration with fire flow test data. The height-adjusted model lead to increased leak localization accuracy compared to the uncalibrated GIS model. However, the most significant improvement was achieved through fire flow test based calibration— revealing a partially closed valve in the system. The auto-calibrated model, which simultaneously calibrated roughness and minor loss coefficients, provided the highest leak localization accuracy.
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ACKNOWLEDGEMENTS
The Austrian Federal Ministry of Agriculture, Forestry, Environment and Water Management as well as two Water Utilities, namely Vienna Water (Municipal Department 31) and Linz AG have supported the research presented in this paper.
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Published In
World Environmental and Water Resources Congress 2019: Hydraulics, Waterways, and Water Distribution Systems Analysis
Pages: 520 - 527
Editors: Gregory F. Scott and William Hamilton, Ph.D.
ISBN (Online): 978-0-7844-8235-3
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: May 16, 2019
Published in print: May 16, 2019
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