Evaluation of performance and optimum valve settings for pressure management using forecasted daily demand curves by artificial neural networks

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2011

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Yıldız, Evren

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For the appropriate operation and correct short term planning, daily demand curve (DDC) of municipal water distribution networks should be forecasted beforehand. For that purpose, artificial neural networks (ANN) is used as a new method. The proposed approach employs already recorded DDCs extracted from the database of ASKI (Ankara Water Authority) SCADA center and related independent parameters such as temperature and relative humidity obtained from DMI (State Meteorological Institute). In this study, a computer model was developed in order to forecast hourly DDCs using Matlab and related modules. Parameters that affect the consumption of the water were determined as temperature, relative humidity, human behavior (weekend or workday) and season. Randomly selected days were taken into account for performance of the ANN model. Forecasted DDC values were compared with recorded data and consequently the model gives relatively satisfactory results, an average of 75% match according to R2 values for Ankara N8-3 network. Same architecture was applied for Antalya network give better results, average of 85%. For planning purposes; total volume and peak water consumption values for the selected recorded days, the day before recorded days, ANN forecasted days and seasonal average was compared and seasonal average gave relatively better results. Using the forecasted DDC, (i) performance analysis of the pressure zone and (ii) optimum valve setting evaluation for pressure management were realized. The results of the study may help water utilities for short term planning of a water distribution network, rehabilitation of elements, taking counter measures and setting the valve openings for minimizing leakage and optimizing customer conformity of the distribution network.

Subject Keywords

Water

URI

http://etd.lib.metu.edu.tr/upload/12613600/index.pdf
https://hdl.handle.net/11511/20917

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

E. Yıldız, “Evaluation of performance and optimum valve settings for pressure management using forecasted daily demand curves by artificial neural networks,” Ph.D. - Doctoral Program, Middle East Technical University, 2011.