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You are here : eLibrary : IAHR World Congress Proceedings : 33rd Congress - Vancouver (2009) : Topic B: Water Engineering in Support of Built Environments : Prevention of cavitation in siphons
Prevention of cavitation in siphons
Author : Cristóbal Mateos Iguácel, Víctor Elviro García, Mª Dolores Cordero Page
During the first two thirds of the 20th Century a large number of dams were constructed in numerous countries with capacities much greater than in previous centuries. Given the time which has elapsed it is natural that the criteria and tools used for evaluating the security of these structures has changed considerably. It is now known that one of the most frequent causes of the collapse of dams has been insufficient capacity of the outlet structures, and it is thus logical that reevaluation of the safety of older dams leads to the conclusion that in many cases it is necessary to increase their outlet capacity. In some cases it is possible to raise the dam crest in order to improve the lamination capacity of the reservoir and to increase the outflow head over the crest and thus the specific discharge.(and thus the total discharge) of an existing spillway. In other cases it is possible to enlarge the outlet structure with additional modules. Furthermore, on occasions (eg where reservoir levels are raised) supplementary dams may be necessary which permit the addition of new spillways. However, in numerous other cases the most suitable solution is the addition of batteries of siphons. Weighing against the advantages, which are described in this article, there are various disadvantages for which, quite justifiably, this solution has been utilised on few occasions. In previous articles (1); (2); and (3) solutions to these difficulties have been presented. In this paper these ideas are briefly summarised, and ideas to reduce the risk of cavitation discussed in greater detail.
File Size : 333,995 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 33rd Congress - Vancouver (2009)
Article : Topic B: Water Engineering in Support of Built Environments
Date Published : 09/08/2009
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