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Assessment of Piano Key Weirs Cost-Effectiveness: a Moroccan Case Study


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DOI: https://doi.org/10.15866/irece.v8i5.12862

Abstract


In a water scarcity context, dam reservoirs play a key role in the socio-economic development. Currently, these dams face two major problems: the siltation that reduces their storage capacity, and the risk of submersion during the extreme floods events, which is directly related to the hydraulic insufficiency of spillways. To overcome these potential deficits in terms of storage capacity and flood discharge, at the least cost, the Piano Key Weir "PKW" can constitute an advantageous alternative solution. In this paper, an exhaustive methodology to assess the PKW cost-effectiveness with a Moroccan case study are presented. This study is carried out on 32 large Moroccan dams. Results show that the PKW allows increasing the total capacity of the studied reservoirs by 1150 Mm3 that is about 20% of their current capacity, at a total cost of 930 MMAD. This recovered volume exceeds by far the total volume lost through siltation. The best cost-effectiveness is observed in both hydraulic basins of Loukkos and Sebou and particularly within dams of low specific flow rates and moderate hydraulic heads. A PKW cost-effectiveness analysis for increasing the flood discharge capacity and a PKW comparison to other alternative solutions are presented as well.
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Keywords


Cost-Effectiveness; Dam; Morocco; Piano Key Weir; Spillway

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References


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