This book offers a timely report on methods for risk assessment procedures for dams, with a special emphasis on dams with small storage dimensions. It starts by introducing all important definitions relating to dams, dam safety, such as the most common failure modes, and risks. In turn, it describes in detail the most important evaluation procedures for various failure modes such as piping, flood, earthquake and stability are described in this chapter. Consequence assessment procedures, together with the different steps of the risk evaluation process, are analyzed, providing a guide on how to identify the appropriate failure mode for the examined dam and setting up the appropriate safety plan. The book introduces the most common methods for predicting peak breach discharge, analyzing some relevant case studies. Upon comparing the findings obtained with the different methods, the book concludes with some general suggestions and ideas for future developments. This book fills an important gap between theoretical works and real-life problems being investigating in practical research studies on dam safety and risk management. It provides readers with the necessary knowledge on risk analysis and shows how to apply this in practice to carry out dam safety studies. It offers practical guidelines to set up risk assessment procedures for different failure modes and predicting failure parameters such as failure time, peak breach discharge and breach width.

The present Bulletin presents a complete response from the 'Technical Committee of ICOLD on Dams and Water Transfer (CDWT)' to the Terms of Reference. It starts with related global information, brings out related efforts made in countries with completely differing climate, economy, population distribution etc. about present status within and between river basins & countries - both surplus and or deficit, while recognizing the crucial role played by dams in water transfer to needy regions. It then enumerates guidelines followed in considering various options, while identifying geographical issues, limited by political territories & legal issues like water treaties. Essentially then, it dwells on possible need, potential and problems in water transfers that must be handled to overcome B/C issues faced by needy countries. In order to assist concerned professionals, the Bulletin finally elaborates on objections raised by different stake-holders in the subject and provides answers generated globally. The on-going debate world-over about WRD versus environmental impacts is then dealt with to help Member-countries overcome various issues. Le present Bulletin presente une reponse complete du " Comite Technique sur les barrages et les transferts d'eau ". Il commence par des informations mondiales, fait ressortir les efforts deployes dans des pays au climat, a l'economie, a la repartition de la population, etc. completement differents sur l'etat actuel au sein et entre les bassins fluviaux et les pays - a la fois excedentaire et / ou deficitaire, tout en reconnaissant le role crucial joue par les barrages dans le transfert d'eau vers les regions necessiteuses. Il enumere ensuite les lignes directrices suivies pour considerer diverses options, tout en identifiant les problemes geographiques, limites par les territoires politiques et les questions juridiques comme les traites sur l'eau. Essentiellement, il s'attarde donc sur les besoins, le potentiel et les problemes possibles des transferts d'eau qui doivent etre traites pour surmonter les problemes auxquels sont confrontes les pays dans le besoin. Afin d'aider les professionnels concernes, le Bulletin elabore enfin les objections soulevees par les differents acteurs du sujet et apporte des reponses generees globalement. Le debat en cours dans le monde entier par rapport aux impacts environnementaux est ensuite traite pour aider les pays membres a surmonter divers problemes.

As reservoir sedimentation has proven to be a serious problem in South Africa, research in this field has been ongoing for more than 70 years. This publication emanates from extensive research which has been undertaken over the past 30 years with the support of the South African Department of Water and Sanitation as well as the South African Water Research Commission. A great deal of information has fortunately also been obtained from China. Given the universal nature of hydraulic formulae it is not surprising, yet gratifying, that Chinese and South African data generally conform to the same mathematical relationships. This indicates that these relationships should be applicable in other countries as well. Much of the information contained here has been condensed from a more comprehensive publication. This ICOLD Bulletin follows on Bulletin 115 "Dealing with reservoir sedimentation", which gave guidelines for management of reservoirs to limit sedimentation. The guidelines on mathematical modelling of sediment transport dynamics in reservoirs in this document can be used during the planning and design of new dams, as well as for the management of existing dams. Comme la sedimentation dans les reservoirs s'est averee etre un probleme serieux en Afrique du Sud, la recherche dans ce domaine est en cours depuis plus de 70 ans. Cette publication emane de la recherche etendue qui a ete menee au cours des 30 dernieres annees avec l'appui du ministere sud-africain de l'eau et de l'assainissement, ainsi que de la commission sud-africaine de recherche sur l'eau. Un grand nombre d'informations ont egalement ete obtenues de la part de la Chine. Etant donne le caractere universel de formules hydrauliques, il n'est pas surprenant, mais tres gratifiant, que les donnees chinoises et sud-africaines se conforment generalement aux memes relations mathematiques. Ceci indique que ces relations devraient etre applicables dans d'autres pays egalement. Une grande partie de l'information contenue ici a ete condensee a partir d'une publication plus complete. Ce bulletin CIGB fait suite au bulletin 115 "Traite sur la sedimentation dans les reservoirs", qui a donne des directives pour la gestion des reservoirs en vue de limiter la sedimentation. Les directives sur la modelisation mathematique de la dynamique de transport des sediments dans les reservoirs de ce present document peuvent etre utilisees lors de la planification et la conception de nouveaux barrages et pour la gestion des barrages existants.

The Bulletin is intended as a general document aimed at a wide technical audience involved with or affected by hydropower. Basic background data and some statistics are presented, with specific reference to hydro-electricity production, hydropower dams, hydropower plants, in operation or under construction. Key aspects of hydropower are discussed. Data are presented about typical capital and both internal and external operating costs. Environmental and social impacts are discussed and reference is made to the impact reservoirs have on greenhouse gas emissions. A section is dedicated to the exploitation of tidal energy by means of barrage systems. The current extent of hydropower development and the influence of policies aimed to favour the development of renewable energies are also discussed. Reference sources of information, on hydropower in general and interesting case-histories, are provided. Le Bulletin se veut un document general destine a un large public technique implique ou affecte par l'hydroelectricite. Des donnees de base et quelques statistiques sont presentees, avec une reference specifique a la production hydroelectrique, aux barrages hydroelectriques, aux centrales hydroelectriques, en fonctionnement ou en construction. Les principaux aspects de l'hydroelectricite sont discutes. Les donnees sont presentees sur le capital type et les couts de fonctionnement internes et externes. Les impacts environnementaux et sociaux sont discutes et il est fait reference a l'impact des reservoirs sur les emissions de gaz a effet de serre. Une section est dediee a l'exploitation de l'energie maremotrice au moyen de systemes de barrage. L'ampleur actuelle du developpement hydroelectrique et l'influence des politiques visant a favoriser le developpement des energies renouvelables sont egalement abordees. Des sources d'information de reference, sur l'hydroelectricite en general et des etudes de cas interessantes, sont fournies.

This book presents practical hydraulic and river engineering research along with fluvial geomorphological concepts, and links the theoretical and practical knowledge of people working every day with rivers, streams, and hydraulic structures to fluvial geomorphology. Besides providing a guide for professionals, this book also provides material for students to acquire the knowledge and skills to rehabilitate rivers, streams, and waterways.

This book focuses on the permeability of the foundation of dams, how to determine their state and how to tighten permeable rock to achieve safe foundations for large dams. It includes theoretical fundamentals as well as lessons learned in their application in practical construction work in eminent projects. It also discusses aspects such as the permeability of the rock mass at the dam site, including the hydraulic characteristics of water conducting openings and their effect on the reliability of water pressure test (WPT) results; the influence of particular geological factors on the hydrogeological regime at the site, as well as the hydrofracturing behavior and individual groutability; and the relationship between quantities of grout takes and the degree of impermeabilization.

Dam decommissioning or dam removal has been increasingly common since the past decade. The reason for considering dam removal may have to do with the safety of dams, high repair costs, high operating and maintenance costs, or effects on fish passage and water quality. However, the decision to remove a dam must be based on careful evaluation of the alternatives to address the specific problem at each dam. The ICOLD Committee for decommissioning dams was established in 2005 to develop information that can be used by ICOLD members to respond to questions about the dismantling of dams and to provide a forum for the exchange of information . This ICOLD Bulletin is not intended as a design guide, but as a guide to the decision making process, consultation and regulatory approvals, design and construction issues, sediment management and performance monitoring. The primary aim of these Dam decommissioning guidelines is to provide dam owners, dam engineers and other professionals with the information needed to guide decision making when considering dam dismantling as a project alternative. They are not meant to be used as a design guide, but as a guide to highlighting the points of interest. The guidelines in this ICOLD Bulletin apply only to flood defense structures and not to fall dams.

Reservoir operation is a multi-objective optimization problem, and is traditionally solved with dynamic programming (DP) and stochastic dynamic programming (SDP) algorithms. The thesis presents novel algorithms for optimal reservoir operation, named nested DP (nDP), nested SDP (nSDP), nested reinforcement learning (nRL) and their multi-objective (MO) variants, correspondingly MOnDP, MOnSDP and MOnRL. The idea is to include a nested optimization algorithm into each state transition, which reduces the initial problem dimension and alleviates the curse of dimensionality. These algorithms can solve multi-objective optimization problems, without significantly increasing the algorithm complexity or the computational expenses. It can additionally handle dense and irregular variable discretization. All algorithms are coded in Java and were tested on the case study of the Knezevo reservoir in the Republic of Macedonia. Nested optimization algorithms are embedded in a cloud application platform for water resources modeling and optimization. The platform is available 24/7, accessible from everywhere, scalable, distributed, interoperable, and it creates a real-time multiuser collaboration platform. This thesis contributes with new and more powerful algorithms for an optimal reservoir operation and cloud application platform. All source codes are available for public use and can be used by researchers and practitioners to further advance the mentioned areas.

Dams are part of human achievements that induce great benefits for society but also bear a potential risk to people, property and the natural environment. The risk of a dam rupture is extremely low and diffi cult to quantify accurately. The aim of 'Dam surveillance' (ICOLD Bulletin 158), is to help reduce these risks by early detection of an undesirable event. The objective of dam surveillance is to make a precise and timely diagnosis of the behavior of dams, in order to prevent undesirable consequences. Both the monitoring system and surveillance program has to be designed and should be able to detect any abnormal behaviour. 'Dam surveillance' (ICOLD Bulletin 158), emphasizes the following aspects: * Routine visual inspection * Special inspection * Checking and testing of Hydro-electromechanical equipment * Monitoring parameters and devices * Automation * Maintenance of ageing monitoring systems * Re-instrumentation of existing dams * Recent developments * Data management * Dam documentation management * Assessment of dam condition and behaviour * Assessment of routine dam safety monitoring programme * Prioritization of maintenance, remedial and upgrading works.

This book covers the fundamentals of reservoir engineering in the recovery of hydrocarbons from underground reservoirs. It provides a comprehensive introduction to the topic, including discussion of recovery processes, material balance, fluid properties and fluid flow. It also contains details of multiphase flow, including pore-scale displacement processes and their impact on relative permeability, with a presentation of analytical solutions to multiphase flow equations. Created specifically to aid students through undergraduate and graduate courses, this book also includes exercises with worked solutions, and examples of previous exam papers for further guidance and practice.As part of the Imperial College Lectures in Petroleum Engineering, and based on a lecture series on the same topic, Reservoir Engineering provides the introductory information needed for students of the earth sciences, petroleum engineering, engineering and geoscience.

Reservoir operation is a multi-objective optimization problem, and is traditionally solved with dynamic programming (DP) and stochastic dynamic programming (SDP) algorithms. The thesis presents novel algorithms for optimal reservoir operation, named nested DP (nDP), nested SDP (nSDP), nested reinforcement learning (nRL) and their multi-objective (MO) variants, correspondingly MOnDP, MOnSDP and MOnRL. The idea is to include a nested optimization algorithm into each state transition, which reduces the initial problem dimension and alleviates the curse of dimensionality. These algorithms can solve multi-objective optimization problems, without significantly increasing the algorithm complexity or the computational expenses. It can additionally handle dense and irregular variable discretization. All algorithms are coded in Java and were tested on the case study of the Knezevo reservoir in the Republic of Macedonia. Nested optimization algorithms are embedded in a cloud application platform for water resources modeling and optimization. The platform is available 24/7, accessible from everywhere, scalable, distributed, interoperable, and it creates a real-time multiuser collaboration platform. This thesis contributes with new and more powerful algorithms for an optimal reservoir operation and cloud application platform. All source codes are available for public use and can be used by researchers and practitioners to further advance the mentioned areas.

In the last decades, the technology of dam protection has undergone major advancements. The increasing demand for safety in modern society has created the need for cost-effective measures to protect critical infrastructure such as dams. This situation has resulted in the drafting of new regulations and technical manuals in countries like Norway, Sweden, and the USA, among others. Dam Protections against Overtopping and Accidental Leakage includes the latest advances in dam protection, and a portfolio of applications in representative case studies. The main topics include: - Failure of embankment and concrete dams due to overtopping or accidental leakage - Hard protections for embankment dams (RCC, wedge-shaped blocks, reinforced concrete slabs) - Soft protections for embankment dams (rockfill toes, articulated concrete blocks, vegetation cover) - Concrete dam protections and additional issues directly related to dam protections The book includes contributions from the 1st International Seminar on Dam Protections against Overtopping and Accidental Leakage (Madrid, Spain, 24-26 November 2014), and also a summary of the technical manual "Overtopping Protection for Dams", published by the US Federal Emergency Management Agency (FEMA) in March 2014. Dam Protections against Overtopping and Accidental Leakage provides a comprehensive summary of dam protections, covering case studies and applied research worldwide, and will be invaluable to professionals and academics in Dam Engineering.

Concrete Face Rockfill Dams presents the state-of-the-art of dam design and construction. This consulting guide presents details and analyses of twenty-eight large CRFD dams worldwide, including the highest dam in the world. Twelve chapters provide specialist information on concepts, designs, technical specifications, construction details, and instrumentation. Both successes and failures that have led to substantial knowledge breakthroughs are discussed. Moreover, attention is paid to the plans for a CFRD dam over 300 meters high. Intended for dam engineers, this illustrated reference volume is also warmly recommended to other engineering professionals working on the design, construction, and operation of dams and related hydraulic structures.

Overview of Japana (TM)s long water history, by the Japanese Commission on large dams. Starting from the 7th century, when irrigation ponds were first constructed for paddy cropping, until the beginning of the 21st century. Elaborates on various roles of dams: water supply, power generation and flood control. Moreover, tries to clarify the negative impacts of dams on the natural environment and local societies, as well as extensive efforts made to minimize these impacts. Includes appendices with location and characteristics of main dams, administrative organs, river management system and water resources development river systems and facilities to offer the full picture. Richly-illustrated. Intended for dam and water resources professionals.

Earthquakes have always been a significant aspect of the design and safety of dams. This position paper deals with the seismic safety of large dams, based on experiences with large earthquakes in Japan (Tohoku earthquake, 2011, Richter magnitude 9.0), in China (Wenchuan earthquake, 2008, Richter magnitude 8.0) and in Chile (Maule earthquake, 2010, Richter magnitude 8.8). It presents ways to prevent key aspects of large dam failure under severe seismic conditions with a focus on design instead of on earthquake prediction. This is done by considering the prevention of uncontrolled rapid release of water of a storage dam under full reservoir conditions in relation to expected seismic conditions. This position paper is composed by the Committee on Seismic Aspects of Dam Design of The International Committee of Large Dams. Les tremblements de terre ont toujours ete un aspect important de la conception et de la securite des barrages. Ce document de synthese traite de la securite sismique des grands barrages, en se fondant sur l'experience acquise lors de grands seismes au Japon (seisme de Tohoku, 2011, magnitude 9,0 sur l'echelle de Richter), en Chine (seisme de Wenchuan, 2008, magnitude 8,0 sur l'echelle de Richter) et au Chili (seisme de Maule, 2010, magnitude 8,8 sur l'echelle de Richter). Il presente des moyens de prevenir les aspects cles de la defaillance des grands barrages dans des conditions sismiques severes en mettant l'accent sur la conception plutot que sur la prevision des seismes. Pour ce faire, on examine la prevention d'une liberation rapide et incontrolee de l'eau d'un barrage de stockage dans des conditions de reservoir plein par rapport aux conditions sismiques prevues. Cet argumentaire est compose par le Comite sur les Aspects Sismiques des Projets de Barrages de la Commission Internationale des Grands Barrages.

Dam Safety Management is a major concern during the entire lifetime cycle of a dam scheme. This is particularly true for the operational phase of the scheme that represents by far the longest period in its lifetime cycle. Bulletin 154 presented a general approach and concepts to be applied to dam operation. The current Bulletin 175 extends the developed concepts to all phases preceding the operational phase. Many risks associated with the operation of existing dams have their origins in other phases preceding the actual operation. Although there are numerous ICOLD Bulletins addressing technical aspects of planning, design, construction and commissioning of dams, there is not a single Bulletin which covers the subject in a comprehensive manner. The current document is a first attempt to capture all relevant dam safety aspects in all preoperational phases by systematically characterizing the actors involved, their roles, the activities and complex interactions present in different phases of the dam lifecycle. An Overarching Safety Management System is specifically developed that can be applied to all actors involved. La gestion de la securite des barrages est une preoccupation majeure pendant tout le cycle de vie d'un projet de barrage. Cela est particulierement vrai pour la phase operationnelle du systeme qui represente de loin la periode la plus longue de son cycle de vie. Le Bulletin 154 presente une approche generale et des concepts a appliquer a l'exploitation des barrages. Le Bulletin 175 actuel etend les concepts developpes a toutes les phases precedant la phase d'exploitation. De nombreux risques associes a l'exploitation des barrages existants ont leur origine dans d'autres phases precedant l'exploitation proprement dite. Bien qu'il existe de nombreux bulletins ICOLD traitant des aspects techniques de la planification, de la conception, de la construction et de la mise en service des barrages, il n'existe pas un seul bulletin qui couvre le sujet de maniere exhaustive. Le document actuel est une premiere tentative de capturer tous les aspects pertinents de la securite des barrages dans toutes les phases pre-operationnelles en caracterisant systematiquement les acteurs impliques, leurs roles, les activites et les interactions complexes presentes dans les differentes phases du cycle de vie du barrage. Un systeme global de gestion de la securite est specifiquement developpe et peut etre applique a tous les acteurs impliques.

This updated edition of the 1979 original covers the landmark struggle to save the New River from damming in the 1970s. The grassroots movement emphasized the river's cultural and historical value rather than narrow environmental issues and became one of the great victories of the environmental movement. This edition also includes a new epilogue examining the current ecological status of the New River and the ongoing impact of the original conservation efforts in the face of new environmental threats. The 1979 edition won the Weatherford Award presented by Berea College and the Appalachian Studies Association.

This book deals with the narratives of water to watt, which includes elementary conceptual design, modern planning, scheduling and monitoring systems, and extensive pre- and post-investigations pertaining to hydropower facilities. It also includes explorations to ensure aspects of dam safety evaluation, effective contract management, specialized construction management techniques, and preferred material and equipment handling systems. Special emphasis is placed upon health, safety, environmental, and risk management concepts. The book discusses a standard QA/QC system to measure and assure quality and an environmental impact assessment to reach the set target in the stipulated timeline within the approved budget. Key Features: Offers comprehensive coverage of hydro-structures and practical coverage from an industry perspective Helps readers understand complexity involved in large-scale interdisciplinary projects Provides good insights on building procedures, precautions, and project management Includes project planning, construction management and hydropower technology, QA/QC, HSE, and statutory requirements Illustrates how to integrate good constructability/buildability into good design for the best monetary value

Viewed by some as symbols of progress and by others as inherently flawed, large dams remain one of the most contentious development issues on Earth. Building on the work of the now defunct World Commission on Dams, Thayer Scudder wades into the debate with unprecedented authority.Employing the Commission's Seven Strategic priorities, Scudder charts the 'middle way' forward by examining the impacts of large dams on ecosystems, societies and political economies. He also analyses the structure of the decision-making process for water resource development and tackles the highly contentious issue of dam-induced resettlement, illuminated by a statistical analysis of 50 cases.

The Eastern Nile riparian countries Egypt, Ethiopia and Sudan are currently developing several reservoir projects to contribute to the needs for energy and food production in the region. The Nile Basin, particularly the Eastern Nile Sub-basin, is considered one of a few international river systems with potential conflicts between riparian countries. In the absence of formal mechanisms for collaboration, the transboundary nature of this basin makes sound water resources development challenging. The large seasonal and inter-annual variability of the river flow exacerbates those challenges. A further complication is the high sediment load in the Eastern Nile rivers during the high flow season. This study contributes to fill relevant knowledge gaps through a better understanding of the methods needed for a complex system of multipurpose reservoirs, considering both water quantity and sediment load. The study quantifies the impacts of water resources development in the Eastern Nile basin and identifies system management options at both regional and country level. Developing a collaborative and unified perspective of the countries towards new projects can be beneficial for all. New operation rules are proposed for improving operation of the current system when new infrastructures are developed and operated either unilaterally or, ideally, cooperatively.

Breakwaters and closure dams belong to the most spectacular hydraulic structures. They are exposed to the most severe loading by waves and currents, either during their construction, or during their life cycle.
Design and construction of these structures are so vitally interrelated that a proper understanding requires a thorough knowledge of the theory and a proper understanding of practical matters.
This book offers an essential, integrated combination of theory and practice to the graduate student. Beginning with a description of the functional requirements, it discusses the relevant theory and shows the application of experience and theoretical knowledge to the design.

Stepped channel designs have been used for more than 3,500 years. A significant number of dams were built with overflow stepped spillways during the nineteenth and early twentieth centuries, before the design technique became outdated with the progresses in hydraulic jump stilling basin design. Recent advances in technology (e.g. RCC, polymer-coated gabion wire) have triggered a regain in interest for the stepped design, although much expertise had been lost in the last eighty years. The steps increase significantly the rate of energy dissipation taking place along the chute and reduce the size of the required downstream energy dissipation basin. Stepped cascades are used also in water treatment plants to enhance the air-water transfer of atmospheric gases (e.g. oxygen, nitrogen) and of volatile organic components (VOC). This book presents the state-of-the-art in stepped channel hydraulics. It is based upon the research expertise of the writer, his professional experience as an expert-consultant, and his experience in teaching stepped spillway hydraulics to undergraduate students, postgraduate research students and professionals since 1982. Results from more than forty-five laboratory studies and four prototype investigations were reanalyzed and compared, enabling the book to provide a new understanding of stepped channel hydraulics, aimed at both the research and professional communities.

Combines More Than 40 Years of Expert Experience Computational modelling and simulation methods have a wide range of applications in hydraulic and coastal engineering. Computational Modelling in Hydraulic and Coastal Engineering provides an introductory but comprehensive coverage of these methods. It emphasizes the use of the finite differences method with applications in reservoir management, closed-conduit hydraulics, free-surface channel and coastal domain flows, surface gravity waves, groundwater movement, and pollutant and sediment transport processes. It focuses on applications rather than lengthy theories or derivations of complex formulas and is supported by a wealth of hands-on numerical examples and computer codes written in MATLAB but available also in BASIC. PowerPoint presentations and learning assignment projects/quizzes, along with learning assessment rubrics, are included. A comprehensive study highlighting the infinite differences method, this book: Covers the fundamentals of flow in pressurized conduits Contains solutions for the classical Hardy Cross pipe network problem Designates the mathematical description of groundwater flow in confined and unconfined aquifers Provides numerical examples for one- and two-dimensional applications including saltwater intrusion Presents examples of transport of pollutants, sediment and air bubbles using Eulerian and Lagrangian solution methodologies Includes information on weighted residuals, the finite elements method, and the boundary integral method Computational Modelling in Hydraulic and Coastal Engineering suits senior-level undergraduates and graduate students as well as practitioners such as coastal and maritime engineers, environmental engineers, civil engineers, computer modellers, and hydro-geologis

Contents:
Foreword. Acknowledgements. Chapter I: Basic Requirements for Optimization. 1.0 Introduction. 1.2 Personnel. 1.3 Management Structure. 1.4 Plant Maintenance. 1.5 Housekeeping. Chapter II: Assessing Plant Performance and Identifying Defects. 2.1 Observing Plant Operation. 2.2 Raw Water Intake 2.3 Raw Water Metering 2.4 Coagulent Handling. 2.5 Flocculation Systems. 2.6 Settling Basins. 2.7 Filters. 2.8 Disinfection. 2.9 Stabilizaion. 2.10 Checklist for Plant Review Chapter III: Water Analysis for Treatment Control. 3.1 Physical Contaminants. 3.2 Biological Variables. 3.3 Chemical Variables and Contamination. 3.4 Laboratory Analysis. Chapter IV: Improving Plants and their Operation. 4.1 Plant Records. 4.2 Raw Water Intake and Flow. 4.3 Rehabilitation of the Chemical Building. 4.4 Pretreatment Units. 4.5 Filter Rehabilitation. 4.6 Filter Operation. 4.7 Stabilization. Chapter V: Determining Design Parameters. 5.1 Introduction to Bench Scale Testing. 5.2 Design and Process Parameters. 5.3 Equipment and Laboratory Space. 5.4 Testing in the Laboratory for Conventional Treatment. 5.5 Testing in the Laboratory for Direct Filtration. 5.6 Sampling for Determinination of Treatment Plant Performance. 5.7 Pilot Plants. 5.8 Treatment Plant as a Pilot Plant. Chapter VI. Disinfection. 6.1 Choice of Process. 6.2 Health Risks of Chlorine. 6.3 Design of Chlorination Facilities. Chapter VII: Optimising and Upgrading Treatment Plants. 7.1 Applying New Technology. 7.2 Optimizing the Treatment Process and Plant Performance. 7.3 Design Information. Chapter VIII: Optimisation and Upgrading of a Plant from 100 ls-1 to 250 ls-1. 8.1 Assessment of Existing Plant. 8.2 Characteristics of the Upgraded Plant. 8.3 Inlet Chamber. 8.4 Initial Mixing of Coagulant and Raw Water. 8.5 Flocculation. 8.6 Distribution of Flocculated Water to Settling Basins. 8.7 Settling Basins. 8.8 Filters. 8.9 Summary. Chapter IX: Optimisation and Upgrading of a Plant from 1m3s-1 to 2.5 m3s-1. 9.1 Assessment of Existing Plant. 9.2 Modifications Required for Upgrading and Optimisation. 9.3 Design of Modifications. Chapter X: Optimisation and Upgrading of a Plant from 20 ls-1 to 50 ls-1 10.1 Assessment of Original Plant. 10.2 Plant performance. 10.3 Upgrading Parameters Determined by Jar Testing. 10.4 Design of Modifications for Upgrading and Optimization. Appendix I Sources of Further Information. Appendix II. Glossary of Terms. Index.

The power sector has undergone a liberalization process both in industrialized and developing countries, involving market regimes, as well as ownership structure. These processes have called for new and innovative concepts, affecting both the operation of existing hydropower plants and transmission facilities, as well as the development and implementation of new projects. At the same time a sharper focus is being placed on environmental considerations. In this context it is important to emphasize the obvious benefits of hydropower as a clean, renewable and sustainable energy source. It is however also relevant to focus on the impact on the local environment during the planning and operation of hydropower plants. New knowledge and methods have been developed that make it possible to mitigate the local undesirable effects of such projects. Development and operation of modern power systems require sophisticated technology. Continuous research and development in this field is therefore crucial to maintaining hydropower as a competitive and environmentally well-accepted form of power generation.