Dam

Slit-check dams are widely employed in mountain river control. However an analysis of their performance in the field is still lacking. In the present work a field verification to evaluate the interaction between solid discharge regime and four slit-check dams built in two subcatchments of ...

The Tabarak Abad Dam on the river Tabarak, a branch of Atrak river, is located about 25 km of northeast of Quchan city in the northeast of Iran. The dam is now under construction and will be completed in 2002. The Tabarak Abad Dam has been designed as an earthfill dam ...

The water resources of the Incomati river basin, shared between South Africa, Swaziland and Mozambique, are intensively used. Moreover, the basin is situated in a part of Africa that over the last 40 years has experienced a dynamic, sometimes turbulent and volatile, political history. Both ingredients might have been sufficient for the emergence of confrontations over water. Tensions between Mozambique, South Africa and Swaziland over Incomati waters existed but never escalated. This case study attempts to explain why cooperation prevailed, by presenting information about the natural characteristics of the basin, its political history, water developments and the negotiations that took place during the period 1967–2002. The paper provides four explanations why tensions did not escalate and cooperation prevailed. It is concluded that the developments in the Incomati basin support the hypothesis that water drives peoples and countries towards cooperation. Increased water use has indeed...

The Asian Development Bank (ADB) is one of the most influential development institutions in the Greater Mekong sub-region in the push to build large-scale infrastructure including hydroelectric dams. Controversies over big dams in Asia have unveiled the lack of effective governance mechanisms through which all stakeholder interests can be taken into account in resource management decision making. In the case of the Theun-Hinboun hydropower project in Lao PDR, the actions of the ADB have showed inadequacies regarding the project decision making and implementation processes although the project has been economically successful and the ADB has enhanced the country's capacity build-up. The aim of the article is to review the history of the Theun-Hinboun project and identify areas that need to be strengthened recognizing future planning needs, and to identify important future lines of study at Theun-Hinboun. Good governance can be enhanced by institutionalizing participation at the p...

Floating mats are locally known as phumdis. They are a heterogeneous mass of soil, vegetation and organic matter at various stages of decomposition. Phumdis play an important role in the ecological processes and functions of the lake ecosystem. The presence of phumdis is the characteristic feature of the Loktak lake, the largest freshwater wetland located in the north-eastern part of India about 38 km from Imphal city of Manipur. Phumdis cover nearly 50% of the lake. In this paper, an attempt has been made to examine the changes in phumdi area, analyse the factors causing its proliferation and the resultant impacts on the environment. The study is based on remotely sensed data of 1989 and 2002. To examine the factors causing its proliferation, field surveys were conducted and data covered eight villages and 377 households. The results showed that the phumdi area has increased from 1989 to 2002. The main causes for phumdi proliferation were the construction of the Ithai Barrage Dam, increase in athaphum fishing, pollution, growth of settlements on phumdis, etc. It was the human pressure that has aided in the growth of phumdis.

Le present article developpe deux actions, conduites par le Cemagref pour le compte du ministere de l'Amenagement du Territoire et de l'Environnement (MATE), ayant pour objectif commun la securite d'ouvrages hydrauliques, relevant du regime de l'autorisation et dont la rupture pourrait avoir des consequences graves pour les personnes et les biens. Concernant les barrages autorises, une enquete nationale, menee de 1990 a 1994, avait revele des lacunes dans la surveillance (assuree par proprietaire) et dans le controle (relevant du service d'Etat) des ouvrages interessant la securite publique. La convention triennale passee entre le MATE et le Cemagref a permis d'instaurer un dispositif complet a destination des services de controle, base sur la formation des intervenants, sur des expertises de barrage a l'occasion des visites decennales et sur la constitution de bases de donnees pour structurer l'information disponible. Ces diverses actions prolongent ...

Resumen: Este estudio tiene como objetivo analizar la inundación causada por la falla hipotética de la Presa Mulacorral, cuyo embalse está localizado en la cuenca alta del río Ambato en la cota 3831 msnm. La presa está ubicada a 42 kilómetros en dirección noroeste de la ciudad de Ambato, capital de la Provincia de Tungurahua, Ecuador. Para el análisis, se consideró una longitud de cauce de 50 kilómetros aproximadamente, desde el pie de la presa hasta los límites de la ciudad de Ambato, en el sector de la planta de tratamiento de aguas residuales. Se ejecutó 10 planes de simulación considerando: el modo de la falla de la presa (tubificación y desborde), opciones de cómputo y tolerancias del programa. Los resultados fueron verificados con ecuaciones de regresión, desarrolladas con base en antecedentes históricos. Los escenarios de rotura presentan en todos los casos niveles de agua que alcanzan la estructura de la vía Flores e infraestructura que se encuentra en las riberas del río Ambato, en un margen promedio de 100 metros. De los escenarios de rotura planteados, se destaca el modelo que utiliza la Ecuación de Froehlich (2008) para falla por desborde, ya que presenta resultados conservadores, un caudal pico máximo de 1271 m3/s y un tiempo de llegada de 2 horas con 20 minutos a la ciudad de Ambato.

Abstract: This study aims to analyze the flood caused by the hypothetical failure of the Mulacorral Dam, whose reservoir is located in the upper basin of the Ambato River at 3831 meters above sea level. The dam is located 42 kilometers northwest of Ambato city, capital of the Tungurahua Province, Ecuador. For the analysis, a length of approximately 50 kilometers was considered, from the dam foot to the limits of the Ambato city, in the wastewater treatment plant sector. Ten simulation plans were executed considering: the dam failure mode (piping and overflow), computation options and program tolerances. The results were verified with regression equations, developed based on historical background. In all cases, the failure scenarios present water levels that reach the Flores Avenue structure and infrastructure located on the banks of the Ambato River, in an average margin of 100 meters. Of the breakage scenarios proposed, the model used by the Froehlich Equation (2008) for overflow failure stands out, since it presents conservative results, a maximum peak flow of 1271 m3/s and a time of arrival of 2 hours and 20 minutes to the Ambato city.

Time for Development of Internal Erosion and Piping in Embankment Dams. [Journal of Geotechnical and Geoenvironmental Engineering 129, 307 (2003)]. Robin Fell, Chi Fai Wan, John Cyganiewicz, Mark Foster. Abstract. ... Internal Erosion and Piping Process. ...

L'agriculture urbaine est visible le long du reseau hydrographique de Ouagadougou, et la plus importante activite de maraichage se rencontre autour des eaux de barrage. En 1989, l'Organisation mondiale de la sante (OMS) a edicte des directives ou des seuils de pollution des eaux d'arrosage ont ete fixes, notamment pour l'arrosage de legumes consommables crus (moins 1E + 03 CF/100 ml, et aucun œuf d'helminthe par litre). Pour evaluer les eaux de barrage utilisees pour arroser des legumes consommables crus dans des contextes saheliens ne depassant pas les seuils de l'OMS, celles de Tanghin et de Boulmiougou, a Ouagadougou, ont fait l'objet d'un suivi microbiologique hebdomadaire durant deux annees consecutives (1994-1995). Les niveaux moyens de pollution bacteriologique (CF/100 ml) ont ete trouves quasiment identiques sur les deux sites (mini

This study discussed conflicts in a large-scale development project realized in an archaeological area. The dam reservoir of Yortanli constructed as a part of a contemporary irrigation project in Western Turkey conflicted with the antique settlement of Allianoi, which had developed in the same area around a natural thermal spring in the 2nd century ad. The aim was to present the protection decisions and implementations related with the archaeological site of Allianoi in the Yortanlı Dam Reservoir so that monitoring and criticism of its consequences can be possible in the future. The tools of the three disciplines, hydraulic engineering, structural engineering and conservation, were emphasized. The following conclusions were derived: The understanding of the protection-development conflict of archaeological heritage-dam relations in the case of Allianoi-Yortanlı necessitates the evaluation of its legal, administrative, technical, and managerial aspects with all related governmental and non-governmental parts. The presented evaluation provides an opportunity for the discussion of the validity of the protection intervention, which is reburial of the remains prior to water retention in the dam, within an international framework. The presentation of the details of the protection process may facilitate the monitoring and criticism of its consequences in the future.

Climate change is expected to result in larger temperature increases (anomalies) at high altitudes compared with surrounding lowlands. In the Andes, this may lead to the accelerated retreat of tropical glaciers, the drying of unique neotropical highmountain wetland ecosystems locally known as páramos or bofedales, as well as increased weather variability and weather extremes, all of which will aff ect water regulation. In turn, these impacts may aff ect ecosystem integrity and the economics of power and water supply in the region. Peru is one of the countries that could be aff ected by these changes: it relies on its mountain basins for the provision of over 50 percent of its power, and discharges from upper basins feed water supply and agricultural systems. The objective of the study is to develop a methodology to assess the net impacts of climate change on the hydrological response in mountainous regions. This is done through a case study in the Peruvian Andes. Having access to an...

Stockholm International Water Institute was contracted by the World Bank in August 2012 to undertake an Independent Evaluation of the Nile Basin Trust Fund (NBTF). The purpose of the evaluation is to identify lessons learned and to help the Bank and the NBTF partners improve the overall performance of future engagement with the NBI and similar River Basin Organizations. The overall purpose of the NBTF was to assist in the preparation and/or implementation of the NBI Strategic Action Program, which is comprised of the Shared Vision Programme (SVP) and the two Subsidiary Action Programmes (SAPs). Over the NBTF period from January 2003 to December 2012, the ten participating development partners pledged and provided USD 191.74 million to the NBI. A result framework helps measure progress towards strategic objectives as well as to achieve them, but in the case of the NBTF there is no over-all results framework. The Independent Evaluation Team (IE-Team) has based the evaluation on progre...