Browsing by Autor "Camilo Salcedo"

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    Minimization of Water Losses in WDS through the Optimal Location of Valves and Turbines: A Comparison between Methodologies
    (2019) Juan Miguel Tapia García; Camilo Salcedo; Juan Saldarriaga
    In water distribution systems, one of the main problems has been the leakages generated by several factor such as pipe breakages or joint failures, among others, having an important impact in the performance indexes of water utilities such as non-revenue water index (NRW). Due to the close relationship between pressure and leakages, the pressure management approaches has demonstrated the best performance for reducing the water losses in water distribution systems. In this research, two different methodologies were proposed for comparing which approach is more efficient in the reduction of water losses: first, the optimal location of pressure reducing valves (PRV) using NSGA-II, and secondly, the optimal location and selection of pumps as turbines (PAT) using SPEA2. A well-known benchmark network was used to test the proposed methodologies, leading to the comparison between the obtained results.
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    Phased Methodology for the Optimal Rehabilitation of a Network with an Intermittent Water Supply Based on Hydraulic Criteria
    (American Society of Civil Engineers, 2025) Juan Saldarriaga; Jessica Bohórquez; Camilo Salcedo; Alexander Garzón; David Celeita; Laura Enríquez; Juana Herrán; Andrés Ariza; María Alejandra González; Santiago Gómez
    The intermittent supply of drinking water represents a major technical and social challenge, affecting more than 1 billion people worldwide. This paper proposes a methodology with three stages to rehabilitate a deteriorated system with intermittent service in a time horizon of five years as part of the Battle of Intermittent Water Supply problem. First, the initial assessment stage identifies vulnerable areas and critical supply hours. The network is analyzed to establish whether it is possible to deliver the desired demand in a scenario without any leaks. The latter is to set a baseline scenario for the upcoming stages. The sectorization stage defines the optimal district metered areas to reduce water losses and increase supplied water through the improved control of flows and pressure. This stage is divided into clustering, by means of the Girvan–Newman algorithm, and partitioning by defining the location of valves. Finally, the third stage determines the optimum investments for asset rehabilitation. The optimization process is performed individually and sequentially for valve settings, pump replacements, storage tanks upgrade, pipe rehabilitation, leakage repair, frequency inverter installation and pumping operation modification, and simple controls. The final solution validates how hydraulic criteria, in combination with optimization techniques and engineering judgment, can significantly improve the operation of an intermittent water distribution system.
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    Use of Hydraulic Criteria to Increase the Efficiency of Optimization Methods for Valve-Setting Problems in Water Distribution Systems
    (2018) Camilo Salcedo; Juan Saldarriaga
    In a water distribution system—WDS, every pipe is considered as a potential candidate to locate a valve, regarding that the usage of these accessories are widely applied with different purposes within water supply systems. Framed in the scope of this research, it has been proposed as a previous stage of the optimization process, the implementation of different techniques that leads to the reduction of the solution space based on the hydraulic knowledge of the network, seeking to obtain results of high quality in an efficient way. Because of this, it was decided to analyze the effect of the reduction of the solution space associated with the optimal valve location problem in a WDS, using three hydraulic criteria based on the operational knowledge of the network, obtaining satisfactory results without losing the quality of the reached solution.
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