Case Study on Hydraulic Performance of Brent Reservoir Siphon Spillway
Publication: Journal of Hydraulic Engineering
Volume 128, Issue 6
Abstract
The Brent Reservoir was constructed in the mid-1830s and its siphon spillways were completed in 1936 to protect the dam from overtopping in the event of an extreme flood. Since completion, there have been problems with the hydraulic performance of the siphons, some of which primed simultaneously, causing flooding downstream. A physical hydraulic model study has been conducted to investigate the hydraulic performance of the siphons in order to establish reliable stage discharge relationships. The existing bellmouth siphon system was found to be unsuitable, causing the siphons to prime suddenly at discharges of around 3 m3/s. This was due to the sudden removal of an air pocket from the siphon’s crown. The model tests were carried out in two stages. In the first stage, the existing geometry was examined. Based on the results from stage 1 of the experiments, it was concluded that the air inlet requires redesign and various options to improve the air regulation should be considered. In the second stage, various options to regulate the inlet of air and establish stable siphon performance over the entire range of discharges were considered. It was found that the most stable conditions are provided by an air slot being cut into the spillway hood at an appropriate level. This geometry provides excellent air-regulated stability, unimpaired spillway capacity, and is insensitive to tail water level and wave conditions in the reservoir.
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References
Babaeyan-Koopaei, K., Valentine, E. M., and Ervine, D. A. (2001). “Hydraulic model study of Brent Reservoir siphon spillway.” XXIX IAHR Cong., Int. Assn. for Hydraulic Research, Beijing.
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Valentine, E. M. (1994). “Brent reservoir siphon spillway hydraulic model study.” Final report prepared for Babtie Shaw & Morton Consulting Engineers and British Waterways, Civil Engineering Dept., Univ. of Newcastle upon Tyne, Newcastle Upon Tyne, U.K.
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Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Jan 17, 2001
Accepted: Dec 19, 2001
Published online: May 15, 2002
Published in print: Jun 2002
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