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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 sédimentation dans les réservoirs s'est avérée être un problème sérieux en Afrique du Sud, la recherche dans ce domaine est en cours depuis plus de 70 ans. Cette publication émane de la recherche étendue qui a été menée au cours des 30 dernières années avec l'appui du ministère 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 également été obtenues de la part de la Chine. Étant donné le caractère universel de formules hydrauliques, il n'est pas surprenant, mais très gratifiant, que les données chinoises et sud-africaines se conforment généralement aux mêmes relations mathématiques. Ceci indique que ces relations devraient être applicables dans d'autres pays également. Une grande partie de l'information contenue ici a été condensée à partir d'une publication plus complète. Ce bulletin CIGB fait suite au bulletin 115 "Traité sur la sédimentation dans les réservoirs", qui a donné des directives pour la gestion des réservoirs en vue de limiter la sédimentation. Les directives sur la modélisation mathématique de la dynamique de transport des sédiments dans les réservoirs de ce présent document peuvent être utilisées lors de la planification et la conception de nouveaux barrages et pour la gestion des barrages existants.
Research on reservoir sedimentation in recent years has been aimed mainly at water resources projects in developing countries. These countries, especially in Africa, often have to cope with long droughts, flash floods and severe erosion problems. Large reservoir capacities are required to capture water provided by flash floods so as to ensure the supply of water in periods of drought. The problem arising however is that these floods, due to their tremendous stream power, carry enormous volumes of sediment which, due to the size of reservoirs, are virtually deposited in toto in the reservoir basin, leading to fast deterioration of a costly investment. Accurate forecasting of reservoir behaviour is therefore of the utmost importance.This book fills a gap in current literature by providing in one volume comprehensive coverage of techniques required to practically investigate the effects sediment deposition in reservoirs has on the viability of water resources projects. Current techniques for practically estimating sediment yield from catchments, estimating the volume of sediment expected to deposit in reservoirs, predicting sediment distribution and calculating scour downstream of reservoirs are evaluated and presented. The liberal use of diagrams and graphs to explain the various techniques enhances understanding and makes practical application simple. A major feature of the book is the application of stream power theory to explain the process of reservoir sedimentation and to develop four new methods for predicting sediment distribution in reservoirs.The book is primarily directed at practising engineers involved in the planning and design of water resources projects and at post-graduate students interested in this field of study.
This book studies the mechanisms and causes of abnormal pressure distribution while drilling.
America's Master Dam Builder is a sweeping biographical epic of Frank T. Crowe. Author Al M. Rocca presents a fascinating story that covers the engineering challenges and triumphs Crowe encountered, from his earliest days with the United States Reclamation Service to his phenomenal conquests of Hoover, Parker and Shasta Dams. Rocca shows how one man rose to the top of the engineering world and supplied the drive and innovation that permitted the construction of large concrete dams, dams of unprecedented size, dams that would transform the American West.
Prepared by the Task Committee on GIS Modules and Distributed Models of the Watershed of ASCE. This report guides professionals in selecting the most advantageous applications of geographic information system (GIS) modules and distributed models for watershed runoff. Recent advances in technology offer hydrologic engineers, watershed managers, and data collection agencies unprecedented capabilities for storing and manipulating data. With the advent of Digital Elevation Models (DEM), Triangulated Irregular Networks (TIN), Digital Line Graphs (DLG), and GIS software, the use of watershed modeling among industry professionals has increased at an incredible rate. With this growth, it is increasingly difficult for practitioners to choose the most effective use of the technology. This report identifies state-of-the-art GIS hydrology analysis software and techniques, as well as GIS types and map projections. It covers data commonly required for hydrologic analysis, limitations of available data, and the integration of watershed hydrological analysis software and GIS techniques. The appendix highlights nine examples of watershed modeling systems, including the Watershed Modeling System (WMS), the Soil and Water Assessment Tool (SWAT), and the Hydrologic Model CASC2D.
Siltation in reservoirs has become an important problem when dams are getting older and stop functioning when the sediment has accumulated to a certain extent. With proper sediment management techniques, negative effects of sediment can be avoided and reservoir life and performance can be improved. This volume deals with reservoir sedimentation, deposition and removal. It provides the principles of sediment transport and gives guidelines to predict reservoir life. It presents several removal techniques, accompanied with detailed operation descriptions. With the help of the RESCON open source software, cost analysis tools to determine the optimum method for maintenance and operation of a reservoir can be applied. To illustrate practice and to assist the reader in setting up a sediment management operation, a number of case studies of existing large dams are included. Written by two experts on reservoir operation, this volume is intended for professionals and advanced students working on dam and reservoir design, construction, operation, maintenance and rehabilitation.
On August 11, 1979, after a week of extraordinary monsoon rains in the Indian state of Gujarat, the two mile-long Machhu Dam-II disintegrated. The waters released from the dam’s massive reservoir rushed through the heavily populated downstream area, devastating the industrial city of Morbi and its surrounding agricultural villages. As the torrent’s thirty-foot-tall leading edge cut its way through the Machhu River valley, massive bridges gave way, factories crumbled, and thousands of houses collapsed. While no firm figure has ever been set on the disaster’s final death count, estimates in the flood’s wake ran as high as 25,000. Despite the enormous scale of the devastation, few people today have ever heard of this terrible event. This book tells, for the first time, the suspenseful and multifaceted story of the Machhu dam disaster. Based on over 130 interviews and extensive archival research, the authors recount the disaster and its aftermath in vivid firsthand detail. The book presents important findings culled from formerly classified government documents that reveal the long-hidden failures that culminated in one of the deadliest floods in history. The authors follow characters whose lives were interrupted and forever altered by the flood; provide vivid first-hand descriptions of the disaster and its aftermath; and shed light on the never-completed judicial investigation into the dam’s collapse.
The Sardar Sarovar Project has been one of the most debated development projects of the past several decades at both an international level and within India itself. Cullet's volume brings together all the key documents relating to the project: including those pertaining to World Bank loans, the judicial pronouncements of the Supreme Court and documents relating to specific local level issues - in particular environment and rehabilitation. The work includes an introductory section focusing on the history of the project, the involvement of the different actors, the impacts on the local population, and a general analysis of the controversy surrounding it. In providing an easily accessible source for all the main documents relating to this landmark project, this compilation will be a valuable resource for researchers and policy-makers working in the areas of International Environmental Law and International Development Law.