Whispers from the depths is more than just the story of the building of the Kariba Dam in the mid-1950s. Built in just five years against overwhelming odds, the dam is a monument to engineering excellence. Shrouded in political undertones, the construction of the dam was vital for the hydro-electric power it would provide for Zambia’s burgeoning copper industry. Little thought, however, appears to have been given to the future of the human and animal populations who lived in the valley that would be inundated when the dam was completed. The question has to be asked: Was this awe-inspiring man-made creation achieved at too high a cost in terms of the human suffering and environmental devastation it caused? Central to the story of Kariba was the fate of the Tonga people who had for centuries lived in the Gwembe valley, due to be flooded when the sluice gates were finally closed to halt the flow of the mighty Zambezi River. Approximately 57 000 people were forced to move from their ancestral homes, abandoning family graves and spiritual sites to the depths of Kariba's water. They became a dispersed people who have never been able to reunite as a cohesive society, never again been able to live peacefully on the banks of the river which gave them life. Animals, too, perished in their thousands despite the gallant efforts of wildlife personnel who mounted a hastily planned rescue mission known as Operation Noah. Whispers from the depths gives a voice to the all but forgotten BaTonga. It celebrates their unique culture but deplores the price they paid for progress – a price from which they themselves derived no benefit whatsoever.

Internal erosion and piping in embankments and their foundations is the main cause of failures and accidents to embankment dams. For new dams, the potential for internal erosion and piping can be controlled by good design and construction of the core of the dam and provision of filters to intercept seepage through the embankment and the foundations. Internal Erosion of Dams and their Foundations brings together a selection of the best reviewed papers from the Workshop on Internal Erosion and Piping of Dams and their Foundations, held in the spring of 2005 in Aussois, France. The book covers the whole internal erosion process, from initiation of erosion, continuation, progression to form a pipe, and formation of a breach. An overview chapter based on the Workshop describes the state of the art in the field and identifies research needs. This resource will be most valuable to dam engineers, researchers and students who are involved in assessing the safety of embankment dams with regard to internal erosion and piping.

Water resources stored by dams and reservoirs play an essential role in water resource management, hydropower and flood control. Where there is an extensive network of dam infrastructures, dams have made a major contribution to economic and social development, providing considerable storage capacity per capita. However, dams and reservoirs may also have an important social and environmental impact, and should be studied within the framework of integrated water resource management and sustainable development. Dams and Reservoirs, Societies and Environment in the 21st Century presents the latest research on the role played by dams and reservoirs in 21st century societies, in developed, emergent and developing countries. It analyses the viability of dams and suggests alternative solutions from a holistic perspective, considering the technical, economic, social and environmental aspects. Other issues covered include the social acceptability of dams, public involvement and dam awareness. The book covers subjects ranging from dam engineering, through the benefits and drawbacks of dams, to their social and environmental impact, and contains numerous case studies of the constructive contributions that reservoirs have made to water development and management. The book is a valuable resource for professional and dam engineers, water managers, governmental organizations and commercial enterprises responsible for dam development and management.

This book comprises the papers of the International Conference on Hydraulics of Dams and Rivers Structures, held in Tehran, 26-28 April 2004. The topics covered include air-water flows, intakes and outlets, hydrodynamic forces, energy dissipators, stepped spillways, scouring and sedimentation around structures, numerical approaches in river hydrodynamics, river response to hydraulic structures and hydroinformatic applications. This proceedings provides professionals and researchers with news of interdisciplinary research findings, considering future development of the sector in its many and various applications.

A book of broad interest to professionals, dam engineers and managers, and to organizations responsible for dam development and management, RCC Dams offers a topical account of the design and operation of roller compacted concrete dams, describing the latest developments and innovative technologies in the field. The book considers planning and design, materials and construction, as well as the operation and performance of RCC dams.

The book describes in twelve chapters the modern tools available for the detection and prevention of leaks from dams and reservoirs, including water chemistry, isotope analyses, artificial tracers, permeability tests, geophysical methods and techniques for the localization of water flows both inside the reservoir and boreholes. Numerous case studies are presented corresponding to studies of more than thirty dams performed by researchers in eighteen different countries.

During the life of a dam, changes in safety standards, legislation and land use will inevitably occur, and functional deterioration may also appear. To meet these challenges, these Proceedings from a panel of international experts assess, define and re-evaluate the design criteria for the construction of dams and the many attendant issues in on-going maintenance and management. Authors include international specialists: academics, professionals and those in local government, utilities and suppliers. Practitioners from these same fields will find the book a useful tool in acquiring a comprehensive knowledge of managing and retrofitting dams, so that they can continue to meet society's needs.

The Proceedings of the Symposium at World Water Day, 2001 presents a discussion of dams and dikes. Various speakers considered the benefits and drawbacks of dams, and there was discussion about why it is that people are against dams in specific situations, and how such situations may be resolved. Solutions are suggested to such controversies. These proceedings contain the full text of the presentations. They will be a useful resource for decision-makers and planners of future projects. This work highlights the international nature of these important hydraulic engineering strucures and both their technology and social implications.

This book provides a discussion of the latest research pertaining to the hydraulic design of spilways and to hydraulic engineering in general. It comprises the papers of a workshop organized to bring together engineers and scientists from around the world for the exchange of ideas on water flow over stepped spillways. This workshop covered a range of subjects from two-phase flow characteristics to refurbishment and implementation of spillways in existing dam structures, and the book also includes a number of illustrative case studies. Overall, this book is one of the first in the rapidly growing field of modern hydraulic engineering techniques. It will interest designers, scientists, and graduate students and researchers in the fields of hydraulic, civil and environmental engineering.

Besides giving an historical introduction to embankment dams the book describes the need for instrumentation, planning procurement and installation practices of instruments. The significance of visual inspection and techniques, of monitoring various parameters, seepage, pore pressure, surface and internal displacements, earth pressures and seismic behaviour, through instrumentation has been described. Collection and processing of data and their use for back analysis to check stability of a dam at various stages of construction and reservoir filling have been suggested. In addition to case histories quoted in various chapters, an exclusive chapter on select case histories has been added which describes the conventional and latest instruments that are being used and methods adopted for installation, monitoring and analyses of data.

Reservoir engineers today need to acquire more complex reservoir management and modeling skills. Principles of Applied Reservoir Simulation, Fourth Edition, continues to provide the fundamentals on these topics for both early and seasoned career engineers and researchers. Enhanced with more practicality and with a focus on more modern reservoir simulation workflows, this vital reference includes applications to not only traditional oil and gas reservoir problems but specialized applications in geomechanics, coal gas modelling, and unconventional resources. Strengthened with complementary software from the author to immediately apply to the engineer's projects, Principles of Applied Reservoir Simulation, Fourth Edition, delivers knowledge critical for today's basic and advanced reservoir and asset management.

Energy dissipators are an important element of hydraulic structures as transition between the highly explosive high velocity flow and the sensitive tailwater. This volume examines energy dissipators mainly in connection with dam structures and provides a review of design methods. It includes topics such as hydraulic jump, stilling basins, ski jumps and plunge pools. It also introduces a general account of various methods of dissipation, as well as the governing flow mechanisms.

Hydraulic engineering of dams and their appurtenant structures counts among the essential tasks to successfully design safe water-retaining reservoirs for hydroelectric power generation, flood retention, and irrigation and water supply demands. In view of climate change, especially dams and reservoirs, among other water infrastructure, will and have to play an even more important role than in the past as part of necessary mitigation and adaptation measures to satisfy vital needs in water supply, renewable energy and food worldwide as expressed in the Sustainable Development Goals of the United Nations. This book deals with the major hydraulic aspects of dam engineering considering recent developments in research and construction, namely overflow, conveyance and dissipations structures of spillways, river diversion facilities during construction, bottom and low-level outlets as well as intake structures. Furthermore, the book covers reservoir sedimentation, impulse waves and dambreak waves, which are relevant topics in view of sustainable and safe operation of reservoirs. The book is richly illustrated with photographs, highlighting the various appurtenant structures of dams addressed in the book chapters, as well as figures and diagrams showing important relations among the governing parameters of a certain phenomenon. An extensive literature review along with an updated bibliography complete this book.

Dams are planned, constructed, and operated to meet human needs - generation of energy, irrigated agricultural production, flood control, public and industrial supply, supply of drinking water, and various other purposes. Dams impound water in reservoirs during times of high flood that can be used for human requirements during times with inadequate natural flows. Positive impacts of dams are improved flood control, improved welfare resulting from new access to irrigation and drinking water. Without dams there would be insufficient food to feed the world's people and energy would be generated by burning fossil fuels that produce greenhouse gases. Despite this progress there remain significant concerns about the environmental impacts of dams. These environmental impacts are complex and far reaching, remote of the dam, and may occur in time with the dam construction or later and may lead to a loss of biodiversity and of productivity of natural resources. This bulletin compiles improvements in knowledge and state of the art technology to avoid or mitigate environmental impacts of dams on the natural ecosystem as well as to the people that depend upon them for their livelihood and also addresses the mitigation of environmental impacts on dams and reservoirs. Les barrages sont planifies, construits et exploites de maniere a repondre aux besoins humains. Les barrages retiennent l'eau dans les reservoirs pendant les periodes de forte crue, une eau qui peut etre utilisee pour les besoins de l'homme pendant les periodes d'insuffisance des debits naturels. Les impacts positifs de barrages sont le controle des crues et l'amelioration du bien-etre resultant du nouvel acces a l'irrigation et a l'eau potable. Sans barrages, la production alimentaire serait insuffisante pour nourrir la population du globe et l'energie serait generee en brulant des combustibles fossiles qui produisent des gaz a effet de serre. Malgre ces progres, d'importantes preoccupations subsistent quant aux retombees des barrages sur l'environnement. Les impacts environnementaux sont complexes et d'une grande portee. Ils peuvent se produire au moment de la construction du barrage ou plus tard et peuvent entrainer une perte de la biodiversite et de la productivite des ressources naturelles. Le present bulletin compile l'amelioration des connaissances et des technologies les plus recentes pour eviter ou attenuer les impacts environnementaux des barrages sur l'ecosysteme naturel ainsi que pour les personnes qui en dependent pour leur subsistance. Il aborde egalement l'attenuation des impacts environnementaux sur les barrages et les reservoirs.

This book addresses current international practices applied for dam safety assessments by looking at a portfolio of dam safety projects in various developing countries (Armenia, Georgia, Tajikistan, Mauritius, Madagascar, Sri Lanka, Myanmar and Vietnam) spread across three continents (Europe, Africa and Asia). Safety assessment involved the review of 134 existing dams and comparison with the best international practices. A large part of dam safety assessment involves understanding of dam hazards, standards applied in the design and maintenance, as well as expectation and social circumstances under which the dams have been designed and constructed in a particular country. For example, standards for design floods, ground investigation, selection of design soil parameters and design earthquakes etc. used are often either non-existent or inadequate, which could lead to an unsafe design. If there are no standards to be applied in dam design and construction, consultants are often under pressure from clients to come up with minimalistic investigation and designs, which, after a few years after dam construction, show signs of deficiencies. Very often countries have no regulations and standards for requirements that should cover the maintenance and operation of dams. The book also describes the Portfolio Risk Assessment of Dams, which can be used as a tool by clients and the funding agencies to identify priority assessment and rehabilitation projects that consider societal and economic losses. It also demonstrates how the implementation of Emergency Preparedness Planning could significantly reduce the number of people at risk. This book aims to help clients, consultants and funding agencies which are engaged in dam safety assessment projects in developing countries to focus on issues that are based on past lessons learnt.

ICOLD Bulletin 180 presents the vast experience gained over the past 6 decades by the dam engineering community in the field of dam surveillance by means of 80 case histories. The documented case histories endeavour to cover the practical experiences related with one or several of the following points: a) Methods for the improvement of the quality and reliability of information. b) Data processing and representation techniques. c) Effective Diagnostic analyses to determine behaviour patterns. d) Dedicated surveillance systems for the optimization of maintenance, rehabilitation, and other life cycle costs. e) Impact of surveillance on preventing dam incidents and dam failure. f) Overview of dam surveillance management systems. The case histories cover a wide variety of technical aspects and deal with success stories but also incidents, some of them with catastrophic consequences. The time framework spans over 70 years: from the times of the Second World War up to the present. The purpose is to learn from these practical experiences, not to criticize the involved individuals, who had to work with the techniques and rules of practice available at the time. This bulletin wants to contribute to keep learning from the experience of the dam engineering community, specifically in the field of dam surveillance. Some of the case histories are widely known and have been described and analysed in numerous publications. Most of them are related to famous dam failure incidents and were compiled as international "benchmark case histories" for this bulletin to focus on the specific lessons learnt related with dam surveillance. Le Bulletin de la CIGB 180 presente la vaste experience acquise au cours des 6 dernieres decennies par la communaute des ingenieurs de barrages dans le domaine de la surveillance des barrages au moyen de 80 histoires de cas. Les histoires de cas documentees s'efforcent de couvrir les experiences pratiques liees a un ou plusieurs des points suivants : a) Methodes d'amelioration de la qualite et de la fiabilite de l'information. b) Techniques de traitement et de representation des donnees. c) Analyses diagnostiques efficaces pour determiner les modeles de comportement. d) Systemes de surveillance dedies pour l'optimisation de la maintenance, de la rehabilitation et des autres couts du cycle de vie. e) Impact de la surveillance sur la prevention des incidents et des ruptures de barrage. f) Apercu des systemes de gestion de la surveillance des barrages. Les histoires de cas couvrent une grande variete d'aspects techniques et traitent de reussites mais aussi d'incidents, dont certains avec des consequences catastrophiques. Le cadre temporel s'etend sur 70 ans : de l'epoque de la Seconde Guerre mondiale a nos jours. Le but est d'apprendre de ces experiences pratiques, pas de critiquer les individus impliques, qui ont du travailler avec les techniques et les regles de pratique disponibles a l'epoque. Ce bulletin veut contribuer a continuer d'apprendre de l'experience de la communaute de l'ingenierie des barrages, en particulier dans le domaine de la surveillance des barrages. Certaines des histoires de cas sont largement connues et ont ete decrites et analysees dans de nombreuses publications. La plupart d'entre eux sont lies a des incidents de rupture de barrages celebres et ont ete compiles en tant qu'" histoires de cas de reference " internationales pour ce bulletin afin de se concentrer sur les lecons specifiques apprises liees a la surveillance des barrages.

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.

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.

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.

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.

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.

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 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.