Abstract
Jinnah barrage has passed more than seventy years of its useful life and is facing some
structural and hydraulic problems. Irrigation & Power Department, Government of Punjab,
Pakistan engaged Evaluation Consultants (EC) in the Year 1998 to review physical health of
the Jinnah barrage. Evaluation consultants noted that the energy dissipation problems persist
downstream of the barrage.
Feasibility study on “Rehabilitation and Modernization of Jinnah Barrage” completed in Year
2005, proposed subsidiary weir with crest at EL676, to be constructed across the river, at a
distance of about 800 ft, downstream of the barrage to address energy dissipation problems.
The crest level of proposed subsidiary weir (EL676) is lower by 2 ft and higher by 1 ft as
compared with crest level of weir and undersluices sections of the barrage, respectively. The
proposed structure if constructed, adversely affect the hydraulic performance of the barrage.
A detailed surface flow analysis was carried out using computer software HEC-RAS for the
existing structure, the proposed subsidiary weir and its alternatives, to optimize rehabilitation
works. This paper discusses the calibration of HEC-RAS model, the surface flow hydraulics of
subsidiary weir and its alternatives.
Z. A. Chaudhry. (2009) Hydraulics of Jinnah Barrage; Existing Structure and Rehabilitation Alternatives, Pakistan Journal of Engineering and Applied Sciences, Volume 4, Issue 1.
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