The Piano Key Weir (PKW) is a weir of particular geometry, associating to a labyrinth shape the use of overhangs to reduce the basis length. The PKW could thus been directly placed on a dam crest. Together with its important discharge capacity for low heads (several times the one of a Creagerweir), this geometric feature makes the PKW an interesting solution for dams rehabilitation as well as new constructions. However, PKW stays a new type of weir, firstly designed in 2001 and built for the first time in 2006 by EDF.

With several researches and projects on PKW all over the world, this workshop aims at bringing together all the people (engineers, researchers,...) interested in PKW to state and summarize the current knowledge on this still non conventional hydraulic structure. Contributions about labyrinth weirs are also welcome. During the workshop, a period of time will also be dedicated to discuss a single nomenclature to name the varied geometric parameters of a PKW.

The papers selected by the International Scientific Committee and presented during the workshop will be published in a hard cover book after the conference.

The workshop environment is willing to be friendly, co-operative and non-competitive.