scholarly journals A study of the water supply system failure in terms of the seasonality: analysis by statistical approaches

2021 ◽  
Author(s):  
Dariusz Młyński ◽  
Tomasz Bergel ◽  
Anna Młyńska ◽  
Kazimierz Kudlik
Keyword(s):  
Water Supply ◽  
Weather Conditions ◽  
Kendall Test ◽  
Supply System ◽  
Water Supply System ◽  
System Failure ◽  
Seasonal Course ◽  
Water Pipelines ◽  
Statistical Approaches ◽  
The Impact

Abstract Among the many factors affecting water supply system failures are the weather conditions that change over the year. Since this is an important research issue, as part of this study, investigation of water supply system failure seasonality by the selected statistical approaches was presented. The basis of the research was monthly number of the pipelines' failures from the multi-year period of 2007–2017 of the municipal water network located in southern Poland. Mann–Kendall test results proved decreasing seasonal trend of the failure rate indexes λ. In turn, the results of the Colwell indexes' calculations allowed it to be stated that seasonal course of the water pipelines' failure events can be relatively easy to predict. As it turned out, it is difficult to determine unambiguously the impact of a given period of the year on the water pipeline failure events' occurrence. However, greater failure-free operation of the water pipelines may be expected in spring and summer months than in autumn and winter months. Because using Colwell indexes for seasonality analysis has no limitations compared to other methods, Colwell indexes may be considered as reliable tools for the assessment of the seasonal course of the water pipelines' failure events.

scholarly journals Development of the Energy Circuits of Development of Contour Regulation of the Supply of Hot Water for Buildings With Variable Flow

2021 ◽  
Vol 7 (1) ◽  
pp. 230-237
Author(s):  
J. Shan ◽  
J. Li ◽  
Z. Guo ◽  
A. Levtsev
Keyword(s):  
Water Supply ◽  
Check Valve ◽  
Supply System ◽  
Water Supply System ◽  
Hot Water ◽  
Actual Measurement ◽  
High Rise ◽  
Hot Water Supply ◽  
Hot Water Supply System ◽  
The Impact

The hot water supply system is one of the important components of the water supply and drainage system of high-rise civil buildings. With the development of the national economy and the improvement of people’s living standards, people’s requirements for popularizing hot water supply and improving hot water supply technology are becoming more and more urgent. In the process of hot water supply, the flow pressure of the pipeline is increased, and the purpose of hot water supply in high-rise buildings is achieved. The experiment analyzes the effect of the pressure ratio on the pipeline in front of the accumulator and the impact valve on the flow of coolant through the check valve. First, through the periodic opening and closing of the shock valve, the pressure continues to rise and fall, and the spring hose exhibits periodic pulsation. The effects of different pressure ratios on pipeline pressure and flow rate are studied, and the data of simulation calculation and actual measurement are analyzed through experiments. The research results have practical significance for improving the water supply efficiency of the hot water supply system of high-rise buildings.

scholarly journals OPTIMIZATION OF HIGH PREASURE PIPELINE IN THE PRESSURE PIPE OF WATER SUPPLY

2017 ◽  
Vol 1 (17) ◽  
Author(s):  
Nedim Suljić ◽  
Jasmin Hrnjadović
Keyword(s):  
Water Supply ◽  
Supply System ◽  
Water Supply System ◽  
Operating Costs ◽  
Complete Analysis ◽  
Pressure Pipe ◽  
Pressure Pipeline ◽  
Basic Parameters ◽  
Quality Water ◽  
The Impact

The water supply system is a set of facilities related to a functional unit with the primary aim ofensuring sufficient quantities of quality water by the most economical way. Design and implementationof such systems requires extensive previous research and analysis aimed at finding the optimal solutionof water supply system.This paper presents an analysis of the pressure pipeline of the water supply system in which discussedseveral alternatives with different input parameters. It is shown the influence of the position and thenumber of tanks in the system on the basic parameters such as a pressure in the pipeline, power of pumpunits and so on. It's analyzed the impact of changes in diameter of the pipe to the hydraulic parameters,and also to the initial and operating costs of the system. The main aim of the complete analysis is toestablish a uniform depending of the analyzed elements in the system and finding the optimalparameters and their relationship that provide the most appropriate solution from the technical andeconomic aspects.

scholarly journals Large waterborne Campylobacter outbreak: use of multiple approaches to investigate contamination of the drinking water supply system, Norway, June 2019

2020 ◽  
Vol 25 (35) ◽  
Author(s):  
Susanne Hyllestad ◽  
Arild Iversen ◽  
Emily MacDonald ◽  
Ettore Amato ◽  
Bengt Åge Sørby Borge ◽  
...  
Keyword(s):  
Water Supply ◽  
Weather Conditions ◽  
Acute Onset ◽  
Case Definition ◽  
Supply System ◽  
Water Supply System ◽  
Control Measures ◽  
Water Supply Systems ◽  
Water Safety ◽  
Drinking Water Supply System

On 6 June 2019, the Norwegian Institute of Public Health was notified of more than 50 cases of gastroenteritis in Askøy. A reservoir in a water supply system was suspected as the source of the outbreak because of the acute onset and geographical distribution of cases. We investigated the outbreak to confirm the source, extent of the outbreak and effect of control measures. A case was defined as a person in a household served by Water Supply System A (WSS-A) who had gastroenteritis for more than 24 h between 1 and 19 June 2019. We conducted pilot interviews, a telephone survey and an SMS-based cohort study of residents served by WSS-A. System information of WSS-A was collected. Whole genome sequencing on human and environmental isolates was performed. Among 6,108 individuals, 1,573 fulfilled the case definition. Residents served by the reservoir had a 4.6× higher risk of illness than others. Campylobacter jejuni isolated from cases (n = 24) and water samples (n = 4) had identical core genome MLST profiles. Contamination through cracks in the reservoir most probably occurred during heavy rainfall. Water supply systems are susceptible to contamination, particularly to certain weather conditions. This highlights the importance of water safety planning and risk-based surveillance to mitigate risks.

scholarly journals Metabolism-based modelling for performance assessment of a water supply system: a case study of Reggio Emilia, Italy

2016 ◽  
Vol 16 (5) ◽  
pp. 1221-1230 ◽  
Author(s):  
T. Liserra ◽  
K. Benzedian ◽  
R. Ugarelli ◽  
R. Bertozzi ◽  
V. Di Federico ◽  
...  
Keyword(s):  
Water Supply ◽  
Urban Areas ◽  
Performance Metrics ◽  
Water Cycle ◽  
Supply System ◽  
Intervention Strategies ◽  
Water Supply System ◽  
Reggio Emilia ◽  
Simulation Tools ◽  
The Impact

A new class of conceptual simulation tools, as a complement to physically based models, is becoming available to simulate the whole water cycle in urban areas for strategic planning, often involving the allocation of a great amount of financial resources. These simulation tools are required to estimate the impact of the today's decisions on the system performance over the next decades and to compare and rank different intervention strategies. To achieve this, this paper aims to build the metabolism-based modelling of a real water supply system using the recently developed WaterMet2 model in order to evaluate long-term performance metrics for possible intervention strategies. This metabolism-based approach was demonstrated for evaluation of the water supply system of Reggio Emilia, Italy, which is one of the demonstration case studies in the EU TRUST (TRansitions to the Urban water Services of Tomorrow) project. Based on the strains imposed by pressing challenges (here population growth) two intervention strategies were analysed. The results obtained show that the built and calibrated WaterMet2 model allows a broader understanding of the impacts of alternative intervention strategies taking into account multidimensional aspects of the sustainability beside conventional service performance.

Optimization of the Regional Municipality of Ottawa-Carleton's water supply system operations. I. Model development

1996 ◽  
Vol 23 (2) ◽  
pp. 347-357 ◽  
Author(s):  
Geneviève Pelletier ◽  
Ronald D. Townsend
Keyword(s):  
Water Supply ◽  
Distribution System ◽  
Model Development ◽  
Treatment Plant ◽  
Supply System ◽  
Water Supply System ◽  
Operating Costs ◽  
Pump Scheduling ◽  
Tariff Structure ◽  
The Impact

The principal objective of this study was to optimize pump scheduling and reservoir releases in the Regional Municipality of Ottawa-Carleton's (RMOC) water supply system with a view to reducing electricity-related operating costs. Pump schedules and reservoir releases for enhanced operation were obtained using a linear programming optimization model that incorporated Ottawa Hydro's electricity tariff structure for "large" users. A second objective was to investigate the impact on system operating costs of increasing (i) reservoir storage capacity, (ii) treatment plant capacity, and (iii) water demand by consumers. This paper (part I) describes the RMOC distribution system and reviews the model development. The next paper (part II) presents the analyses performed for the two study objectives, and important results. Key words: water supply system, pump scheduling, pumping costs, optimization, modelling.

scholarly journals Investigation of Water Loss from Pipes Located in Various Relief Features of Iaşi County

2019 ◽  
Vol 13 (1) ◽  
pp. 171-179
Author(s):  
Ștefania Chirica ◽  
Mihail Luca ◽  
Iustina Lateș
Keyword(s):  
Water Supply ◽  
Water Loss ◽  
Geographic Area ◽  
Supply System ◽  
Water Supply System ◽  
Detection Methods ◽  
Water Supply Systems ◽  
Water Losses ◽  
Functional Features ◽  
The Impact

Abstract Water losses are present in all water supply system pipes. Their parameters and value vary depending on the constructional and functional features of the pipes (diameter, material, pressure, embedding environment, location, position etc.). The phenomenon is present in all water supply systems networks in Romania as well as globally. The water supply pipes within the regional water supply system are located in areas with diversified relief, from plateaus and hills to plains. The studies and researches were carried out in the geographical placement area of the Timişeşti-Iaşi pipeline. The geographic area studied is enclosed in Siret and Prut hydrographic basins. The paper aims to establish a correlation between the detection methods of water leaks from pipes and the areal relief features in Iaşi County. At the same time, it is highlighted the impact of the variation of the geographical relief characteristics on the water loss management on different type of pipes.

scholarly journals Risk assessment models to investigate the impact of emergency on a water supply system

2020 ◽  
Vol 20 (8) ◽  
pp. 3542-3556
Author(s):  
Honghua Shi ◽  
Xiaosheng Wang ◽  
Haiying Guo ◽  
Huifeng Hao
Keyword(s):  
Risk Assessment ◽  
Water Supply ◽  
Supply System ◽  
Risk Tolerance ◽  
Water Supply System ◽  
Economic Losses ◽  
Water Supply Systems ◽  
Tolerance Index ◽  
Risk Assessment Models ◽  
The Impact

Abstract A water supply system is a critical infrastructure to support industrial and agricultural production and human life. It often operates abnormally in an emergent risk situation, resulting in shortage or suspension of water supply, even health risk and economic losses. In order to reduce negative impacts posed by these potential threats, identifying and evaluating possible risks in a water supply system has been becoming more necessary. For this reason, we establish two risk assessment models in accordance with two different situations based on uncertainty theory in the presence of insufficient historical data. In the proposed models, we first discuss emergency in three respects: the possibility of emergency occurrence, the consequence caused by emergency and system vulnerability. Then the risk to a water supply system is defined by the uncertain measure of loss-positive by incorporating a risk tolerance index and loss function contributed by the above analysis. Moreover, several theorems for calculating the risk index of series and parallel water supply systems are presented. Finally, we illustrate the feasibility and validity of the proposed models by implementing a series of numerical examples and further present some noteworthy observations.

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