Optimal operation of pumping stations in Water Distribution Networks (WDNs) is presented based on three conflicting objectives, including 1) pumping energy costs, 2) hydraulic reliability, and 3) quality reliability. We proposed a three-objective optimization algorithm called Clustered Non-dominated Archiving Ant Colony Optimization (Clustered-NA-ACO) and evaluated the efficiency of this algorithm

A new optimization technique called Whale Optimization Algorithm (WOA) is applied for the least cost design of pipe networks. The rounded search agents of the algorithm were considered to cope with the discrete nature of pipe diameters as the decision variables in the optimization process. In addition, a new performance indicator based on both number of generations and the minimum number of evaluations

In a water distribution system, maintenance is an essential pillar to ensure that an efficient service is provided and to combat problems such as real water losses. Managing such a system’s maintenance needs involves multiple stakeholders, subjective variables, and requires a learning process to find a solution. Structuring the problem can provide clarity for the situation under analysis, especially

ABSTRACT Water demand forecasting is a crucial task in the efficient management of the water supply system. This paper compares classical and adapted machine learning algorithms used for water usage predictions including ARIMA, support vector regression, random forests and extremely randomized trees. These models were enriched with human mobility data to improve the predictive power of water demand

The seasonal and interannual variations of total coliforms (TC) and Escherichia coli (EC) were investigated in an urban tropical lake. Precipitation and flow rate were the controlling parameters influencing coliform dynamics. Correlations were obtained to describe the lake inlet conditions of flow rate, TC and EC. While TC increased with flow rate, EC slightly decreased. This unexpected behaviour for

This work introduces WUDESIM, an open-source C/C++ toolkit for modeling water quality in the dead-end branches of drinking water distribution networks. WUDESIM is linked to the programmers’ toolkit of EPANET, a widely-used public-domain water network analysis model. In place of the advection-based water quality module in EPANET, WUDESIM allows the users to simulate water quality in the pipes of dead-end

This paper aims to analyze the flood hazard in the city of Monza, which periodically suffers from overflows from both the river Lambro and the urban drainage system during wet weather conditions. A unified Urban Flash Flood Model of Monza is therefore developed to capture both sources of hazard. The model is first validated by comparing the results of simulations with historical data related to the

Water systems and particularly wastewater treatment may only improve or keep high-quality service if their performance is continuously measured and benchmarked against peers. This paper presents a case-study developed under the Portuguese Initiative on Water Quality, Treatment and Energy (iEQTA-WWTP), involving 7 water utilities, and focused on the performance assessment of 23 urban wastewater treatment

(2020). Correction. Urban Water Journal: Vol. 17, No. 1, pp. 86-86.

Water-related hazards such as water scarcity may be mitigated by considering interbasin and intersectoral transfers of freshwater, and by promoting the use of non-conventional water resources. This paper deepens on key driving factors able to define the benefits and barriers of a water exchange among agricultural and urban-tourism activities as a mechanism to reduce water scarcity risk in the Marina

This paper proposes a hybrid modelling approach for early urban flood warning and forecasting purpose. The hybrid model structure proposed combines a deterministic sewer model with a probabilistic logistic regression model. By varying the sewer model structures from complex hydrodynamic models to simple conceptual models, different hybrid models are constructed in order to accommodate different levels

Wastewater-source heat pump (WWSHP) applications to wastewater collection systems provide an attractive option for recovery of thermal energy. Although the idea is not new, there are few if any existing studies that talk about how the WWSHP location relative to the collection system influences efficiency. We used a wastewater collection system model and cost-benefit analysis to examine the payback

A novel pressure-based leakage assessment and characterisation method was applied to a range of bulk pipelines in the field to evaluate the practical application of the method. With this method, the testing equipment, which consists of a variable speed pump unit, a water tank and measuring equipment, all mounted on a trailer, was connected to a bulk pipe which could be isolated. Flow was then introduced

Appropriate control of pressure is a significant engineering concern in the management of pipeline systems. Pressure fluctuations caused by water hammers can cause substantial damages, such as ruptures and bursts in pipelines. The generation of vaporous cavitation at a pressure lower than the vapor pressure introduces column separation in the flow regime. The appropriate installation of a pressure

Water supply systems (WSS) in developing countries present high water loss and energy consumption rates, thus strategies for conservation of these resources are needed. The challenge is to define which strategies offer better results based on multiple criteria and on the different interests of the stakeholders involved. The objective of this study is to apply the decision support tool, named Water

Anew and simple model for sizing surge vessels on pumping mains has been developed. The Monte Carlo Simulation (MCS) is utilized to generate 2000 realizations for various cases of up- and down-surges. Approximate models are developed for the prediction of the initial and the expanded vessel’s gas volume. The developed models outperformed the existing design charts; yielding better scores in various

Sustainable urbanization in semi-arid cities of third world countries like India demands an Integrated Urban Water Management System for sustainable water supply. Physical availability of water is rarely a determinant of good drinking water supply. To understand the associates and determinants of water supply, a micro-level has been done along the urban-rural continuum of two semi-arid cities, showing

Water Safety Plans (WSPs) are a management tool to identify and prioritize risks and implement appropriate control measures throughout the water supply chain, from catchment to consumer. WSPs have been implemented in over 90 countries; yet, costs, benefits and the enabling environment elements necessary for WSP implementation are under-studied. To better understand these factors, we conducted interviews