Comparison of Complete Modeling/Simplified Modeling of Zaragoza City Water Supply Networkby R. Aliod,
Document Type: Proceeding Paper
Part of: WRPMD'99: Preparing for the 21st Century
(No paper) Zaragoza is a Spanish city with 600.000 inhabitants and a water supply network of 900km long. The Council technical services uses a Microstation based GIS, GRED, for network cartography and maintenance. Recently, interactive connectivity with EPANET 1.1.e have been provided to GRED GIS. GRED provide different tools for systematic demand specification at nodes: individual outlets, water distribution related to length of tube connected, area distribution. Fluid Mechanics Department of the Zaragoza University has closely collaborated with the Zaragoza water supply utility technical staff to set-up and calibrate the modeling system. EPANET hydraulic and water quality simulations have been performed for the complete network with the different methodologies provided by GRED to automatically generate water demand at nodes. At the same time, different simplified versions of the network have been generated by means of GRED automatic filtering tools corrected with a careful inspection of the complete pipe distribution and flow distribution supposed. Predictions in computed flow rates and pressures haven been compared at the same elements for a set of six different models generated: four complete models (including all pipes, any size); two simplified models (diameter bigger than 300mm, or smaller if necessary, to close loops). Measurements are also available at well identified nodes and pipes. Conclusions are presented in relation with the demand modeling strategies and network level description.
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