Publications
113 results found
Leitao JP, Simoes NE, Maksimovic C, et al., 2010, Real-time forecasting urban drainage models: full or simplified networks?, WATER SCIENCE AND TECHNOLOGY, Vol: 62, Pages: 2106-2114, ISSN: 0273-1223
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- Citations: 25
Hurford AP, Maksimovic C, Leitao JP, 2010, Urban pluvial flooding in Jakarta: applying state-of-the-art technology in a data scarce environment, WATER SCIENCE AND TECHNOLOGY, Vol: 62, Pages: 2246-2255, ISSN: 0273-1223
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- Citations: 8
Wang LP, Maksimovic C, Onof C, 2010, An improved multifractal model for short-term rainfall forecast, 10th International Conference on Computing and Control for the Water Industry, Publisher: CRC PRESS-TAYLOR & FRANCIS GROUP, Pages: 775-780
Rodriguez JP, Achleitner S, Moederl M, et al., 2010, Sediment and pollutant load modelling using an integrated urban drainage modelling toolbox: an application of City Drain, WATER SCIENCE AND TECHNOLOGY, Vol: 61, Pages: 2273-2282, ISSN: 0273-1223
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- Citations: 12
Simoes NE, Leitao JP, Maksimovic C, et al., 2010, Sensitivity analysis of surface runoff generation in urban flood forecasting, WATER SCIENCE AND TECHNOLOGY, Vol: 61, Pages: 2595-2601, ISSN: 0273-1223
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- Citations: 12
Savic DA, Boxall JB, Ulanicki B, et al., 2009, Project neptune: Improved operation of water distribution networks, Geotechnical Special Publication, Pages: 543-558, ISSN: 0895-0563
Water service providers (WSPs) in the UK have statutory obligations to supply drinking water to all customers that complies with increasingly stringent water quality regulations and minimum flow and pressure criteria. At the same time, the industry is required by regulators and investors to demonstrate increasing operational efficiency and to meet a wide range of performance criteria that are expected to improve year-on-year. Most WSPs have an ideal for improving the operation of their water supply systems based on increased knowledge and understanding of their assets and a shift to proactive management followed by steadily increasing degrees of system monitoring, automation and optimisation. The fundamental mission is, however, to ensure security of supply, with no interruptions and water quality of the highest standard at the tap. Unfortunately, advanced technologies required to fully understand, manage and automate water supply system operation either do not yet exist, are only partially evolved, or have not yet been reliably proven for live water distribution systems. It is this deficiency that the project NEPTUNE seeks to address by carrying out research into 3 main areas; these are: data and knowledge management; pressure management (including energy management); and the associated complex decision support systems on which to base interventions. The 3-year project started in April of 2007 and has already resulted in a number of research findings under the three main research priority areas (RPA). The paper summarises in greater detail the overall project objectives, the RPA activities and the areas of research innovation that are being undertaken in this major, UK collaborative study. Copyright 2009 ASCE.
Savic DA, Boxall JB, Ulanicki B, et al., 2009, Project neptune: Improved operation of water distribution networks, Proceedings of the 10th Annual Water Distribution Systems Analysis Conference, WDSA 2008, Pages: 543-558
Water service providers (WSPs) in the UK have statutory obligations to supply drinking water to all customers that complies with increasingly stringent water quality regulations and minimum flow and pressure criteria. At the same time, the industry is required by regulators and investors to demonstrate increasing operational efficiency and to meet a wide range of performance criteria that are expected to improve year-on-year. Most WSPs have an ideal for improving the operation of their water supply systems based on increased knowledge and understanding of their assets and a shift to proactive management followed by steadily increasing degrees of system monitoring, automation and optimisation.The fundamental mission is, however, to ensure security of supply, with no interruptions and water quality of the highest standard at the tap. Unfortunately, advanced technologies required to fully understand, manage and automate water supply system operation either do not yet exist, are only partially evolved, or have not yet been reliably proven for live water distribution systems. It is this deficiency that the project NEPTUNE seeks to address by carrying out research into 3 main areas; these are: data and knowledge management; pressure management (including energy management); and the associated complex decision support systems on which to base interventions. The 3-year project started in April of 2007 and has already resulted in a number of research findings under the three main research priority areas (RPA). The paper summarises in greater detail the overall project objectives, the RPA activities and the areas of research innovation that are being undertaken in this major, UK collaborative study. ©ASCE 2009.
Maksimovic C, Masry EN, 2009, Potentials for improvement of energy efficiency for new design of water distribution systems, Pages: 290-297
Energy expenditure from pumps in water supply systems can account for up to 50 % of the running costs of a water distribution system. The purpose of this paper, based on the second author's MSc dissertation is to present the results of cost-benefit analyses with regards to pumping costs for a water distribution system if it were to be designed form scratch. A case study of a real life system is used to demonstrate the methodology proposed. Current practice involves pumping to high water tower elevations and in many cases reducing system pressure in areas of the network by use of pressure reducing valves (PRVs). This causes unnecessarily high pumping costs and may also lead to leakage and bursts within the system. The proposed alternative considers pumping to lower elevations with subsequent boosting to regions with low pressures in order to reduce the risks of leakage and pipe failure, as well as pumping costs within the system. It was found that the use of boosting pump in a system with low tower elevation proved to be up to 19% more cost-effective than using PRVs in systems with high water tower elevations. ©ASCE 2009.
Hoult N, Bennett PJ, Stoianov I, et al., 2009, Wireless sensor networks: creating smart infrastructure [Awarded the ICE 2010 Telford Gold Medal], Proceedings of the ICE - Civil Engineering, Vol: 162, Pages: 136-143, ISSN: 0307-8353
The deterioration of civil infrastructure is a significant issue throughout the world. To manage infrastructure in a way that ensures safe and efficient operation, managers and engineers require data about its short- and long-term performance. This paper reports on the trial installations of wireless sensor networks in a suspension bridge, slab bridge, rail tunnel and water supply pipeline. Each installation is introduced in terms of hardware, measured parameters, sensors, sampling regimes and installationand operational challenges. Preliminary results from each system are discussed to illustrate the variety of information that can be made available to managers and engineers, and how this information canbe utilised and presented.
Karamouz M, Nokhandan AK, Kerachian R, et al., 2009, Design of on-line river water quality monitoring systems using the entropy theory: a case study, ENVIRONMENTAL MONITORING AND ASSESSMENT, Vol: 155, Pages: 63-81, ISSN: 0167-6369
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- Citations: 50
Maksimovic C, Prodanovic D, Boonya-Aroonnet S, et al., 2009, Overland flow and pathway analysis for modelling of urban pluvial flooding, JOURNAL OF HYDRAULIC RESEARCH, Vol: 47, Pages: 512-523, ISSN: 0022-1686
Leitao JP, Boonya-aroonnet S, Prodanovic D, et al., 2009, The influence of digital elevation model resolution on overland flow networks for modelling urban pluvial flooding, WATER SCIENCE AND TECHNOLOGY, Vol: 60, Pages: 3137-3149, ISSN: 0273-1223
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- Citations: 26
Makropoulos C, Koutsoyiannis D, Stanic M, et al., 2008, A multi-model approach to the simulation of large scale karst flows, JOURNAL OF HYDROLOGY, Vol: 348, Pages: 412-424, ISSN: 0022-1694
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- Citations: 22
Verhoeven C, Maksimovic C, Blom J, 2007, Addressing algae: Reed bed treatment to improve surface waters around Utrecht, Water 21, Pages: 56-57, ISSN: 1561-9508
A pilot plant was initiated in the Leidsche Rijn area by the municipality of Utrecht, the Waterboard De Stichtse Rijnlanden and the province of Utrecht, to remove phosphate from eutrophic surface water using vertical flow reed beds to prevent algal blooms. The Leidsche Rijn surface water contained 0.3 mg phosphorus concentration (P/l), while its is assumed that for optimal water quality the phosphate level should be less than 0.15 mg/l in canals and ditches, and less than 0.05 mg P/l in the lake to prevent nuisance algal blooms. The pilot plant contained two sections, both containing 10% of calcium carbonate but one, the reference filter, containing 2.5% of iron shavings and the other without added iron. The presence of iron shavings in the vertical flow reed bed in combination with a good distribution and oxidizing conditions ensured high and stable phosphate removal efficiency from the Leidsche Rijn surface water.
Segond M-L, Neokleous N, Makropoulos C, et al., 2007, Simulation and spatio-temporal disaggregation of multi-site rainfall data for urban drainage applications, HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES, Vol: 52, Pages: 917-935, ISSN: 0262-6667
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- Citations: 39
Jankovic-Nisic B, Graham NJD, Maksimovic C, et al., 2007, Cost-effective leakage reduction through district metering, PROCEEDINGS OF THE INSTITUTION OF CIVIL ENGINEERS-WATER MANAGEMENT, Vol: 160, Pages: 181-187, ISSN: 1741-7589
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- Citations: 1
Ashley R, Blanksby J, Cashman A, et al., 2007, Adaptable urban drainage: Addressing change in intensity, occurrence and uncertainty of stormwater (AUDACIOUS), Built Environment, Vol: 33, Pages: 70-84, ISSN: 0263-7960
Local drainage systems are crucial to everyone. These comprise building drainage systems and the drainage networks around buildings, locally in streets and in small ditches and watercourses. Problems arise both due to the inflows to the system, which in future will be less certain, and increasing downstream hydraulic and regulatory constraints on outflows. In addition, key stakeholders often find it difficult to engage due to the complex institutional structure of flood risk management in England and Wales. The major drivers identified for future increases in flood risks relate to rainfall, environmental legislation, urbanization and urban planning. In a recent UK government study it was identified that traditional solutions to managing urban drainage related flood risk changes are likely to be too costly and that alternatives need to be found. The development of an analytical approach to local urban drainage that takes account of potential future changes, such as climate and urban form, is described that will allow alternative adaptable solutions to be evaluated. The approach has been applied to several case studies. The effectiveness of these processes in the light of changing future risks is reviewed and a proposed framework and guide for adapting urban drainage systems to climate change presented.
Makropoulos C, Butler D, Maksimovic C, 2006, Discussion of "Editorial - The peer-review system: prospects and challenges", HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES, Vol: 51, Pages: 350-351, ISSN: 0262-6667
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- Citations: 1
Ireson AM, Makropoulos C, Maksimovic C, 2006, Water Resources Modelling under Data Scarcity: Coupling MIKE BASIN and ASM Groundwater Model, Water Resources Management, Vol: 20, Pages: 567-590
Maksimović C, 2005, Editorial, Ecohydrology and Hydrobiology, Vol: 5, Pages: 261-262, ISSN: 1642-3593
Cabrera E, Juan García V, Cabrera E, et al., 2005, Discussion of "Use of flow meters for managing water supply networks" by Bojana Janković-Nišić, Čedo Maksimović, David Butler, and Nigel J. D. Graham, Journal of Water Resources Planning and Management, Vol: 131, Pages: 477-479, ISSN: 0733-9496
Jankovic-Nisic B, Maksimovic C, Butler D, et al., 2005, Closure to "use of flow meters for managing water supply networks" by Bojana Jankovic-Nisic, Cedo Maksimovic, David Butler, and Nigel J. D. Graham, JOURNAL OF WATER RESOURCES PLANNING AND MANAGEMENT-ASCE, Vol: 131, Pages: 478-479, ISSN: 0733-9496
Covas D, Ramos H, Young A, et al., 2005, Uncertainties of leak detection by means of hydraulic transients: From the lab to the field, Proceedings of the 8th International Conference on Computing and Control for the Water Industry, CCWI 2005: Water Management for the 21st Century, Vol: 2
The aim of the current paper is two-fold. First, the paper reports the investigation of two transient-based techniques for leak detection in water pipe systems using physical data collected in the laboratorial, quasi-field and field conditions. The first technique is the time analysis of the leak travelling wave and the second is inverse transient analysis. The latter was approached through the development of an inverse transient analysis tool and the collection of transient data for the testing and validation of the model. Transient data were collected from two experimental facilities - Imperial College London and Thames Water (London, UK) - and from a real life water transmission system - Lintrathen East Trunk Main Network - at Scottish Water (Dundee, UK). Collected data were used to investigate to which extent transient pressure signals could be used for leak detection, location and quantification. The second and ultimate goal of this paper is driving forward a discussion about the application of these (and other) transient-based techniques for effectively detecting and locating leaks in real life systems and giving insights into the sources of uncertainty associated with them. Transient-based techniques have been shown to be successful in the detection and location of leaks of 'reasonable' size, providing that physical and hydraulic characteristics of the system are known, the transient is generated by a fast-linear manoeuvre of a valve and, in the case of inverse analysis, an accurate transient solver is used; however, leak location accuracy depends on the leak size and location, flow regime, location where the transient event is generated, pipe material, system configuration (e.g. branches, diameters) and presence of intermediate obstacles. Fieldworks, available resources and the analysis of collected data have allowed the assessment of practical difficulties in the implementation of the proposed techniques in real life systems.
Djordjevic S, Prodanovic D, Maksimovic C, et al., 2005, SIPSON - Simulation of interaction between pipe flow and surface overland flow in networks, Water Science and Technology, Vol: 52, Pages: 275-283, ISSN: 0273-1223
Covas D, Stoianov I, Mano JF, et al., 2005, The Dynamic Effect of Pipe-Wall Viscoelasticity in Hydraulic Transients. Part II-Model Development, Calibration and Verification, Journal of Hydraulic Research, Vol: 43, Pages: 56-70, ISSN: 0022-1686
A state-of-the-art mathematical model has been developed to calculate hydraulic transients in pressurized polyethylene (PE) pipe systems. This hydraulic transient solver (HTS) incorporates additional terms to take into account unsteady friction and pipe-wall viscoelasticity. Numerical resultsobtained were compared with the classic waterhammer solution and with experimental data collected from a PE pipe-rig at Imperial College (London, UK). Unlike the classical model, the developed HTS is capable of accurately predicting transient pressure fluctuations in PE pipes, as well ascircumferential strains in the pipe-wall. The major challenge was the distinction between frictional and mechanical dynamic effects. First, the HTS was calibrated and tested considering these two effects separately: if only unsteady friction was considered, a major disagreement between collecteddata and numerical results was observed; when only the viscoelastic effect was considered, despite the good agreement between data and numerical results, the calibrated creep function depended on the initial flow rate. In a second stage, the combination of these dynamic effects was analysed: creepwas calibrated for laminar flow and used to test the solver for turbulent conditions, and a good agreement was observed. Finally, the HTS was tested using creep measured in a mechanical test, neglecting unsteady friction, and a good agreement was obtained.
Jankovic-Nisic B, Maksimovic C, Butler D, et al., 2004, Use of flow meters for managing water supply networks, JOURNAL OF WATER RESOURCES PLANNING AND MANAGEMENT, Vol: 130, Pages: 171-179, ISSN: 0733-9496
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- Citations: 15
Covas D, Stoianov I, Mano JF, et al., 2004, The dynamic effect of pipe-wall viscoelasticity in hydraulic transients. Part I - experimental analysis and creep characterization, JOURNAL OF HYDRAULIC RESEARCH, Vol: 42, Pages: 516-530, ISSN: 0022-1686
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- Citations: 159
Covas D, Stoianov I, Mano J, et al., 2004, The Dynamic Effect of Pipe Wall Viscoelasticity in Hydraulic Transients – Part I. Experimental Analysis and Creep Characterization, Journal of Hydraulic Research, Vol: 42, Pages: 516-530, ISSN: 0022-1686
The mechanical behaviour of the pipe material determines the pressure response of a fluid system during the occurrence of transient events. In viscoelastic pipes, typically made of polyethylene (PE), maximum or minimum transient pressures are rapidly attenuated and the overall pressure wave is delayed in time. This is a result of the retarded deformation of the pipe-wall. This effect has been observed in transient data collected in ahigh-density PE pipe-rig, at Imperial College (London, UK). Several transient tests were carried out to collect pressure and circumferential strain data. The pipe material presented a typical viscoelastic mechanical behaviour with a sudden pressure drop immediately after the fast valve closure, a major dissipation and dispersion of the pressure wave, and transient mechanical hysteresis. The creep-function of the pipe material was experimentallydetermined by creep tests, and, its order-of-magnitude was estimated based on pressure–strain data collected from the pipe-rig. A good agreement between the creep functions was observed. Creep tests are important for the characterization of the viscoelastic behaviour of PE as a material; however,when PE is integrated in a pipe system, mechanical tests only provide an estimate of the actual mechanical behaviour of the pipe system. This is because creep depends on not only the molecular structure of the material and temperature but also on pipe axial and circumferential constraints andthe stress–time history of the pipe system.
Covas D, Stoianov I, Ramos H, et al., 2004, Water Hammer in Pressurized Polyethylene Pipes: Conceptual Model and Experimental Analysis, Urban Water Journal, Vol: 1, Pages: 177-197
This paper analyzes the dynamic effects of pipe wall viscoelasticity on hydraulic transients. These effects have been observed in transient data collected from two polyethylene (PE) pipe systems. The first is a 270 m pipeline, 50 mm diameter, at Imperial College London, and the second is the world's longest experimental PE pipeline, 1.3 km long, 110 mm diameter, buried underground at Thames Water Utilities (London, UK). A mathematical model has been developed to calculate hydraulic transients in polyethylene pipe systems based on the assumption that the viscoelastic behaviour of pipe walls is linear. An additional term has been added to the continuity equation to describe the retarded deformation of the pipe wall and the resulting governing equations are solved by the Method of Characteristics. The numerical results are compared with both the classic elastic solution and with collected transient data. Good agreement between numerical results for the viscoelastic solution and observed data was obtained by fitting the creep function J(t). Unlike classic water hammer analysis, the developed mathematical model is capable of accurately predicting transient pressures in polyethylene pipes and the circumferential strains in the pipe walls.
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