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1. Introduction A piano key weir (PKW) is a nonlinear and labyrinth-type spillway weir, which was first introduced by Hydrocoop in France [1] and proposed by Lempérière and Ouamane [2] . The innovative design of the labyrinth weir replaces the traditional vertical design with an upstream/downstream overhang extension, extending the spillway crest and reducing the basement of the weir.
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