The recently developed Piano Key weir (PKW) spillway, which is an innovative structure that canconvey very high specific discharges, is a variation of the traditional labyrinth weirs, firstly devised tocircumvent some drawbacks of the latter (Barcouda et al., 2006). Using a rectangular layout andramped floors which create overhanging or cantilevered apexes, the PKW is structurally simple andefficient, can be placed on existing or new gravity dam crest sections and multiplies significantly thedischarge capacity compared to a standard weir of similar width
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