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A subsidiary weir was proposed by feasibility consultants to rehabilitate and modernize Jinnah Barrage. This
weir is to be constructed across the river, at a distance of about 800 ft, downstream of the barrage. Subsidiary weir
location and crest level was finally fixed on the basis of a detailed physical model study. This model study was
carried by Irrigation Research Institute (IRI) at their Lahore laboratory under the technical guidance of “Feasibility
Consultants”.
The “Detailed Design Consultants” while finalizing rehabilitation structure (either subsidiary weir or its
alternative) requested IRI for another model study, which was carried out at Nandipur Research Station. It seems
that the two model studies were under taken for the same project, having almost similar objectives. This paper
critically reviews the judiciousness of two model studies carried out for the same project. Furthermore, the
experimental results of various rehabilitation alternatives are also discussed in terms of their reliability and
effectiveness.
Key Words: Jinnah barrage, physical model study, rehabilitation and modernization of Jinnah barrage, subsidiary
weir, two-step stilling basin.
Z. A. Chaudhry. (2009) Physical Model Studies of Energy Dissipation Systems to Rehabilitate Jinnah Barrage, Pakistan Journal of Engineering and Applied Sciences, Volume 5, Issue 1.
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