397111 - Analysis of WDS considering change in water demand: topology, rehabilitation and optimal designs
Wednesday, June 6
2:00 PM - 3:30 PM
Location: Lakeshore C
Laura Vega, Bogota, Colombia – Universidad de los Andes; Ana Moreno, Bogota, Colombia – Universidad de los Andes
The population growth in cities is one of the most influencing factors in the configuration, expansion and operation of different infrastructure systems of the city; among these are the Water Distribution Systems (WDS). In fact, the maximum urban population growth rate has been in the last fifty years, especially in emerging countries. This statistic varies between 60% and 80% in developing countries and it is directly related with high urban population densities. Indeed, to 2017 about 13% of the world population lives in cities with more than 5 million inhabitants. Regarding WDS, the infrastructure design is usually made considering a design period in which population growth is estimated; however, its nondeterministic nature introduces great uncertainty concerning the future operation of the network. Additionally, different variations in demand behavior over time, including population growth and the tendency of high densification, have forced some water utilities to develop different isolated solutions that do not guarantee the proper operation of the whole network over time. This paper delve this field with more detail taking into account the impact and relation of population growth in WDS configuration and performance.
This research seeks to address this problem with two approaches: analyzing the topologic variation of WDS optimal designs under different levels of water demand and location of feeding reservoirs and tanks; and identifying some criteria of WDS rehabilitation under various demand scenarios to improve the performance of the whole system. Some surrogate measures of networks reliability were taken into account to develop a rehabilitation methodology with increasing water demands and it’s results were compared with optimal designs. The use of REDES and the toolkit of EPANET, two computational models, were required to accomplish this task. The analysis was performed in WDS of different Colombian towns and some hydraulic DMAs in main Colombian cities.