Faculty of Civil Engineering
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Item type:Publication, Modern SCADA Solution for Mitigation of Water Losses in Water Distribution Network(ETAI 2024, 2024-09); ; This paper explores the optimization and management of a water distribution network using a SCADA system integrated with DMAs (District Metered Areas) and PMAs (Pressure Management Areas) to improve hydraulic characteristics. The study demonstrates the importance of early fault detection, real-time monitoring, and effective pressure management within high-pressure zones to reduce water loss, enhance operational efficiency, and extend the lifespan of infrastructure. It recommends future improvements, including the addition of a new PMA to further regulate pressure, reduce faults, and decrease water consumption. By implementing these strategies, the network can achieve significant financial and environmental benefits, ensuring sustainable and efficient water supply management. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Application of building information modeling (BIM) in hydrotechnics(Macedonian Committee on Large Dams, 2024-10); - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Application of retention basins to reduce the impact of climate change on existing stormwater drainage systems(Savez inženjera i tehničara Srbije, Beograd, 2024-10); Nikola KrstovskiWe are increasingly witnessing the occurrence of short-term and intense rainfall, which manifests in the flooding of urban areas, causing significant financial damage, and in certain cases it can cause loss of human lives. Therefore, it is becoming more evident that we must immediately confront the challenges of climate change, which primarily require the application of engineering knowledge to reduce their impact, especially in terms of accepting and safely draining stormwater. The aim of this paper is to analyze the application of retenti on basins to reduce peak stormwater runoff by using hydraulic modeling of the existing stormwater drainage system. Specifically, retention basins are becoming increasingly necessary in modern urban planning, where they serve as reservoirs for floodwaters from areas that gravitate towards urban centers. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Mathematical model for technical economic analysis for the optimization of pump gravity water supply system(Savez inženjera i tehničara Srbije, Beograd Za, 2024-10); Nikola KrstovskiThe rapid growth of the price of electricity has led to the need for the management of water supply systems to have a new primary goal, which is the capture of new underground gravity sources of water that are at a relatively greater distance from the existing water supply system, in order to reduce the quantities of water that are provided by pumping. The purpose of this paper is to develop a mathematical model for a technical economic analysis (cost benefit analysis) of an existing water supply system for which an additional gravity source of water is foreseen, where by analyzing the construction costs of the gravity pipeline and the total operating costs of the system such as: maintenance, depreciation and electricity costs, the optimal amount of water that should be taken from the future gravity water source will be determined. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Hydraulic analysis to reduce water losses in a water supply system without tank(Savez inženjera i tehničara Srbije, Beograd, 2024-06)Water supply system without tank is almost non-existent, because the main purpose of the tank is to balance the consumption with the inflow of water. In exceptional cases, according to the theoretical settings, when the capacity of the water spring is greater than the maximum pick hour consumption of water, it is not necessary to build/predict a tank. However, in such systems, the boundary condition that ensures water consumption is a water spring that supplies the population with water by gravity, while these springs have a significantly higher capacity than water consumption so the users together with the managers of the system are misled that there is no need to worry about water consumption, all this is so until the consumption of water does not exceed the capacity of the source, what is realistic to expect in the future due to the increasing impacts of climate change on the capacities of the water springs. The aim of this paper is to analyze the total water consumption with special attention to the total water losses in the water supply network through a hydraulic analysis of a water supply system without a tank whereby, as a Case study, the water supply system of the city of Gostivar in Macedonia is analyzed - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Hydraulic model for managing a water supply system with significant water losses(CROATIAN WATER POLLUTION CONTROL SOCIETY Zagreb, Ulica grada Vukovara 220, Croatia, 2024-04); Nikola KrstovskiThe tendency of modern society is to ensure quality and comfortable living conditions. The need for the water appears as one of the crucial human needs, which increases exponentially through changing living habits over the time. While on the other hand, as an effect of climate changes, amount of the precipitation decreases e.g. the volume of surface water decreases as well as the capacity of underground water. According to that, drinking water abundance period is ending and changes in the management of water supply systems are necessary. This is particularly significant for a country like N. Macedonia, where the existing water supply systems are outdated and without modern management, resulting significant water losses throughout the water distribution network, especially during periods when drinking water is available in smaller quantities. According to all previous researches, it is clear that the magnitude of pressure is directly correlated with water losses in the network. One of the ways to influence on reduction of this negative phenomenon is proper pressure management in the distribution network of the water supply system. Additionally, reducing water losses is not the only benefit of pressure management. Another significant advantage is the decrease in the number of defects occurring in the distribution network, thus extending the lifespan of pipelines. In this study, by applying modern research and creating a hydraulic simulation model, the effects and benefits of managing pressures in the water supply network were examined. The focus was on the water supply system of the city of Resen, where current pressures are very high (5-7 bar), while total water losses amount is 55%. The significant losses are primarily attributed to poor system management. Specifically, during increased pressures in the network, they are reduced by opening relief valves, resulting in a substantial amount of water loss. With the implemented measures from the hydraulic model for system management, the pressure in the water supply network is within the range of 2.5-3.5 bar. Water losses have been reduced by 9%, and the overall water consumption decreases by 44%. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Mathematical model for the analysis of unsteady flow during a pressure pipeline break using the method of characteristics(Slovak University of Technology in Bratislava, 2024-09); Nikola KrstovskiThe goal of developing a mathematical model to analyze the occurrence of non-stationary flow is to conduct an analysis of an existing pressure pipeline - specifically, a siphon from an irrigation system in Macedonia. In this system, when a defect occurs in the pipeline, particularly in the section experiencing the highest pressure, the phenomenon of non-stationary flow arises - creating a significant vacuum within the pipeline, leading to a massive breakdown. Specifically, this concerns a steel pipeline with a diameter of D=1640 mm, operating at a maximum working pressure of 8.2 bar in the lowest part of the siphon. When non-stationarity occurs, a substantial negative pressure (vacuum) emerges, resulting in complete destruction of the pipeline over a length of 500 m. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Experimental and numerical model for analysis of the water hammer in pump water supply system(Slovak University of Technology in Bratislava, 2024-09); Nikola KrstovskiWater supply systems in such transient regimes should be hydraulically analyzed by means of basic equations for unsteady flow. For the needs of this research, by using the method of characteristics, a custom mathematical model HTM is developed for the purpose of water supply network analysis in conditions of unsteady flow, i.e. with this mathematical model, the characteristics of the water hammer in closed systems for water transport under pressure can be seen. In addition, a physical model in ratio 1:1 has been made for in-situ analyses of pressure change in occurrence of water hammer in the water supply system. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Using EPANET for determining the hydraulic capacity of a siphon in an irrigation system(Macedonian Committee on Large Dams, 2023-10); Nikola KrstovskiConsidering the spatial arrangement of the irrigation systems, siphons are often part of the main supply pipelines, which represent objects that are used most often for the passage of the pipeline under a river, road, railway, waterway, etc., and the same hydraulically function as water pipline pressure systems. The purpose of this paper is to demonstrate the use of the software for hydraulic analysis of pipeline pressure systems (EPANET ) to determine the hydraulic capacity of a siphon from an irrigation system. Namely, this paper analyzes a case study of an existing siphon "Makaria" which is part of the Tikvesh irrigation system, where a major accident occurs on part of the siphon. The application of EPANET in solving the specific challenge is crucial in the quick and accurate selection of the optimal diameter of the pipeline, because the existing siphon has a diameter of 1620 mm and at the time of the accident there is no possibility to install a pipeline with the same diameter because its production requires longer time which in this case is a key factor because the water needs are urgent. Accordingly, by using EPANET, hydraulic calculations were made for several variants with the application of different pipelines, from which the selection of the optimal diameter of the pipeline was made and, accordingly, the selection of the material for the pipeline with the basic criterion of ensuring the maximum possible flow of water throughout the siphon. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Using EPANET for determining the hydraulic capacity of a siphon in an irrigation system(Macedonian Committee on Large Dams, 2023-10-06); Nikola KrstovskiConsidering the spatial arrangement of the irrigation systems, siphons are often part of the main supply pipelines, which represent objects that are used most often for the passage of the pipeline under a river, road, railway, waterway, etc., and the same hydraulically function as water pipline pressure systems. The purpose of this paper is to demonstrate the use of the software for hydraulic analysis of pipeline pressure systems (EPANET ) to determine the hydraulic capacity of a siphon from an irrigation system. Namely, this paper analyzes a case study of an existing siphon "Makaria" which is part of the Tikvesh irrigation system, where a major accident occurs on part of the siphon. The application of EPANET in solving the specific challenge is crucial in the quick and accurate selection of the optimal diameter of the pipeline, because the existing siphon has a diameter of 1620 mm and at the time of the accident there is no possibility to install a pipeline with the same diameter because its production requires longer time which in this case is a key factor because the water needs are urgent. Accordingly, by using EPANET, hydraulic calculations were made for several variants with the application of different pipelines, from which the selection of the optimal diameter of the pipeline was made and, accordingly, the selection of the material for the pipeline with the basic criterion of ensuring the maximum possible flow of water throughout the siphon.