Peter Chalk Centre

University of Exeter

Stocker Road

Exeter

EX4 4QD

Tel: +44 (0)1392 263637

E-mail: CCWI2019@exeter.ac.uk 

17th International Computing & Control for the Water Industry Conference

1st - 4th September 2019
University of Exeter, UK
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7A Systems modelling

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Dragan Savic

Chair:

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Optimal Design of the Structured Monitoring System of the Strategic Supply Network of Ho Chi Minh City (Vietnam)

Javier González

Presenter:

Authors:

Javier Campos, Javier González and Sarai Díaz

Ho Chi Minh City (Vietnam) water supply system provides clear water to a very densely populated area, with around 8.5 million inhabitants. Network management has to deal with a huge system, highly interconnected and with capacity limitations, which requires to keep serviceability conditions in a very fast growing city. ICT strategy is intended for this case as the key investment for improving network performance and maximizing water supply service levels. Present work shows the ICT solution design developed to be implemented by SAWACO, which includes the Optimal Structured Network Monitoring System. This system is able to provide efficient information about the network performance in order to maximize knowledge about the system state. The design basis of the new system pursues not only to monitor water supply but also to identify and locate leaks and bursts, to detect undeclared maneuvers on valves/pumps, to quantify unmetered DMA inflows/outflows, to identify measurement equipment malfunction, to calibrate pipe roughness and the overall capacity of the network, etc. To achieve such level of knowledge, an optimal measurement equipment location procedure has been developed that fits functional, topological and constructive criteria, creating an efficient measurement equipment system that constitutes a Structured Subnetwork System. This new configuration allows not only to improve the network hydraulic state identification accuracy (flow and pressure conditions, water quality, network anomalies, etc.) but most importantly, to achieve this with enough guarantees to support the network operation.

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Loopnet. A new and more efficient EPANET-based Toolkit based on the loop equations

Fernando Martínez Alzamora

Presenter:

Authors:

Fernando Martínez Alzamora and Fernando Alvarruiz

Since the release of EPANET version 2.0 in 2000, which implemented the GGA method to obtain the equilibrium state for a water distribution network in each time step, there have been little progress to date as far as improving the computational efficiency is concerned. The only improvements have been the exploitation of the parallel computing capabilities of current multicore processors and, more recently, the improvement of the matrix reordering algorithm that will see the light in the upcoming version 2.2 of EPANET. However, the loop method, known since it was first proposed by Hardy-Cross in 1936, although solving the same equilibrium problem with a smaller number of equations, has been relegated to a secondary role due to the difficulty of finding a suitable choice of loops and also keeping a symmetric coefficient matrix with a constant structure independently of the regulating elements status. Recent advances have proved that the loop method can be more efficient than the current GGA method in most of the networks, especially in networks not presenting a high number of loops. This communication presents the tool LOOPNET, developed by the authors, which offers improved performance with respect to EPANET version 2.1. The authors think that time reduction could be especially important for detailed networks obtained from GIS, where branch components have an important presence. The proposed LOOPNET Toolkit is completely compatible with the current EPANET GUI, supporting all the API functions of the current EPANET Toolkit as long as the nodal demands are fixed, and is freely available to the research community at GitLab under MIT license.

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Use of Generator Algorithms Approaches for Modelling Virtual WDN to Complete Cadastral Information

Juan Saldarriaga

Presenter:

Authors:

Daniela Rojas and Juan Saldarriaga

It is well known that Water Distribution Networks (WDNs) constitute one of the main infrastructures of every modern city, as it is necessary for developing the land-use planning programs and regulation of new urban developments or even for network rehabilitation interventions. Unfortunately, in many developing countries, there are many municipalities that do not have access to a complete cadastral information of their own WDN and, consequently, the activity of completing this information results is unfeasible due to high costs. Therefore, in the recent years, there have been several approaches for generating virtual networks with a high probability of simulating the geometric and hydraulic behaviour of the real WDN [1], [2], [3], using different generator algorithms, based on few known data. As it already has been analysed, the existing correlation between the streets spatial distribution of a city and the network layout, for different cities in Colombia [4], this research aims to evaluate the importance of having partial information of the real systems to generate reliable virtual networks that may become operational benchmark tools for urban planning and rehabilitation. Information related to spatial distribution of the population or knowing main-pipe route of different real systems of cities in Colombia, may be essential for improving the reliability of generating virtual networks for completing cadastral data, using the generator approach of DynaVIBe-Web and the EPANET extension WATERNETGEN.

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Topological and Geometrical Analysis of the Historical Development of WDS Using Graph Theory

Juan Saldarriaga

Presenter:

Authors:

Natalia Hernández and Juan Saldarriaga

Urban areas are dynamic structures which tend to be affected by several phenomena, such as demographic and geographical changes. In this context, Water Distribution Systems (WDS) are an important component of these areas, because they guarantee life quality standards to the population. Historically, WDS have been developed based upon the urban growth of the city, without considering the impact over the performance indexes of the system. This has led to water networks with operational problems such low pressures, low water quality and low resilience, among others. Based on the information/facts mentioned above, this research aims to understand the development of WDS using topological, geometrical and hydraulic perspectives that are measured with several indexes. Different WDS located in Colombia have been tested using the proposed methodology for determining the behaviour of the networks. With the results, some improvements to the system can be suggested to accomplish the most desirable and relievable development in the future.

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