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Article

Water Pipe Replacement Scheduling Based on Life Cycle Cost Assessment and Optimization Algorithm

Department of Civil Engineering, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si 17104, Korea
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Academic Editors: Helena Alegre and Rita Salgado Brito
Water 2021, 13(5), 605; https://doi.org/10.3390/w13050605
Received: 3 February 2021 / Revised: 15 February 2021 / Accepted: 23 February 2021 / Published: 25 February 2021
(This article belongs to the Special Issue Infrastructure Asset Management of Urban Water Systems)
Water distribution networks (WDNs) comprise a complex network of pipes and are crucial for providing potable water to urban communities. Therefore, WDNs must be carefully managed to avoid problems such as water contamination and service failures; however, this requires a large budget. Because WDN components have different statuses depending on their installation year, location, transmission pressure, and flow rate, it is difficult to plan the rehabilitation schedule within budgetary constraints. This study, therefore, proposes a new pipe replacement scheduling approach to smooth the investment time series based on a life cycle cost (LCC) assessment for a large-scale WDN. The proposed scheduling plan simultaneously considers both the annual budget limitation and the optimum expenditure on the useful life of pipes. A multi-objective optimization problem consisting of three decision-making objectives—minimum imposed LCC on the network, minimum standard deviation of annual investment, and minimum average age of the network—is thus solved using a nondominated sorting genetic algorithm to obtain an optimal plan. Three scenarios with different pipe replacement time spans and different annual budget constraints are considered accordingly. The results indicate that the proposed scheduling framework provides an efficient water pipe replacement scheduling plan with a smooth management budget. View Full-Text
Keywords: life cycle cost; multi-objective optimization; pipe replacement scheduling; smoothing investment life cycle cost; multi-objective optimization; pipe replacement scheduling; smoothing investment
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MDPI and ACS Style

Ghobadi, F.; Jeong, G.; Kang, D. Water Pipe Replacement Scheduling Based on Life Cycle Cost Assessment and Optimization Algorithm. Water 2021, 13, 605. https://doi.org/10.3390/w13050605

AMA Style

Ghobadi F, Jeong G, Kang D. Water Pipe Replacement Scheduling Based on Life Cycle Cost Assessment and Optimization Algorithm. Water. 2021; 13(5):605. https://doi.org/10.3390/w13050605

Chicago/Turabian Style

Ghobadi, Fatemeh, Gimoon Jeong, and Doosun Kang. 2021. "Water Pipe Replacement Scheduling Based on Life Cycle Cost Assessment and Optimization Algorithm" Water 13, no. 5: 605. https://doi.org/10.3390/w13050605

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