Rehabilitated Taunsa Barrage: Prospects and Concerns

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Science, Technology and Development Vol. 33 (3), 2014

Research Article
Rehabilitated Taunsa Barrage: Prospects and Concerns

Zulfiqar Ali Chaudary and Muhammad Kaleem Sarwar

Abstract: A sub-weir was constructed at a distance of 900 feet downstream of Taunsa barrage in the year 2007 to manage the retrogression by raising the tail water level. The barrage showed poor performance during the flood 2010 which caused uncontrolled breach in its left marginal bund. The sub-weir raised water level; the question may arise regarding sedimentation between barrage and sub-weir at low flows and discharge capacity of the barrage. This study investigates the performance of energy dissipation system and discharging capacity of Taunsa barrage in pre- and post-construction scenarios of the sub-weir. The study also indicates that hydraulic functioning of the sub-weir is rather complex and energy dissipation system is not performing efficiently. Moreover the presence of a sub-weir downstream of Taunsa barrage is conceptually erroneous. It seems that the sedimentation between barrage and sub-weir at low flows was not considered before the construction of sub-weir. Field evidences show that functioning of the undersluices is also being compromised after the construction of sub-weir.

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