Preface Acknowledgements Organization Organizing institutions and sponsors Keynote lectures From Labyrinth to Piano KeyWeirs – A historical review, A.J. Schleiss General comments on Labyrinths and Piano KeyWeirs: The past and present, F. Lempérière, J.-P. Vigny &A. Ouamane Hydraulic characteristics of labyrinth weirs, B.M. Crookston & B.P. Tullis Physical modeling – Hydraulic capacity PKWeir and flap gate spillway for the Gage II Dam, V. Dugué, F. Hachem, J.-L. Boillat, V. Nagel, J.-P. Roca & F. Laugier Piano KeyWeir design study at Raviege dam, S. Erpicum, V. Nagel & F. Laugier Nine years of study of the Piano KeyWeir in the university laboratory of Biskra “lessons and reflections”, A. Ouamane Influence of the Piano KeyWeir height on its discharge capacity, O. Machiels, S. Erpicum, P. Archambeau, B. Dewals & M. Pirotton Study of optimization of labyrinth weir, M. Ben Saïd &A. Ouamane Influence of Piano KeyWeir geometry on discharge, R.M. Anderson & B.P. Tullis Study of piano-key morning glory to increase the spillway capacity of the Bage dam, G.M. Cicero, M. Barcouda, M. Luck & E. Vettori Physical modeling – Downstream fittings Contribution to the study of the Piano KeyWeirs submerged by the downstream level, F. Belaabed &A. Ouamane Flow properties and residual energy downstream of labyrinth weirs, R. Lopes, J. Matos & J.F. Melo Energy dissipation on a stepped spillway downstream of a Piano KeyWeir – Experimental study, S. Erpicum, O. Machiels, P. Archambeau, B. Dewals, M. Pirotton & C. Daux Coupled spillway devices and energy dissipation system at St-Marc Dam (France), M. Leite Ribeiro, J.-L. Boillat, A.J. Schleiss & F. Laugier Energy dissipation downstream of Piano KeyWeirs – Case study of Gloriettes Dam (France), M. Bieri, M. Federspiel, J.-L. Boillat, B. Houdant, L. Faramond & F. Delorme Numerical modeling A sensitivity analysis of Piano KeyWeirs geometrical parameters based on 3D numerical modeling, J. Pralong, F. Montarros, B. Blancher & F. Laugier Hydraulic comparison between Piano KeyWeirs and labyrinth spillways, B. Blancher, F. Montarros & F. Laugier 1D numerical modeling of the flow over a Piano KeyWeir, S. Erpicum, O. Machiels, P. Archambeau, B. Dewals & M. Pirotton Influence of structural thickness of sidewalls on PKW spillway discharge capacity, F. Laugier, J. Pralong & B. Blancher Experimental study of side and scale effects on hydraulic performances of a Piano KeyWeir, G.M. Cicero, J.M. Menon, M. Luck &T. Pinchard Hydraulic design Study of optimization of the Piano KeyWeir, A. Noui &A. Ouamane Experimental parametric study for hydraulic design of PKWs, M. Leite Ribeiro, J.-L. Boillat, A.J. Schleiss, O. Le Doucen & F. Laugier Main results of the P.K weir model tests in Vietnam (2004 to 2010), M. Ho Ta Khanh, T. Chi Hien & N. Thanh Hai Piano KeyWeir preliminary design method – Application to a new dam project, O. Machiels, S. Erpicum, P. Archambeau, B. Dewals & M. Pirotton Method to design a PK-Weir with a shape and hydraulic performances, G.M. Cicero Planned and existing projects Lessons learnt from design and construction of EDF first Piano KeyWeirs, J. Vermeulen, F. Laugier, L. Faramond & C. Gille P.K weirs under design and construction in Vietnam (2010), M. Ho Ta Khanh, D. Sy Quat & D. Xuan Thuy Spillway capacity upgrade at Malarce dam: Design of an additional Piano KeyWeir spillway, T. Pinchard, J.-M. Boutet & G.M. Cicero Rehabilitation of Sawara Kuddu Hydroelectric Project – Model studies of Piano KeyWeir in India, G. Das Singhal & N. Sharma A dam equipped with labyrinth spillway in the Sultanate of Oman, L. Bazerque, P. Agresti, C. Guilbaud, S. Al Harty &T. Strobl Labyrinth fusegate applications on free overflow spillways – Overview of recent projects, M. Le Blanc, U. Spinazzola & H. Kocahan Nomenclature, data base, future developments A naming convention for the Piano KeyWeirs geometrical parameters, J. Pralong, J. Vermeulen, B. Blancher, F. Laugier, S. Erpicum, O. Machiels, M. Pirotton, J.-L. Boillat, M. Leite Ribeiro &A.J. Schleiss Creation of a PKW Database – Discussion, J.-L. Boillat, M. Leite Ribeiro, J. Pralong, S. Erpicum & P. Archambeau Development of a new concept of Piano KeyWeir spillway to increase low head hydraulic efficiency: Fractal PKW, F. Laugier, J. Pralong, B. Blancher & F. Montarros General comments on labyrinths and Piano KeyWeirs – The future, F. Lempérière & J.-P. Vigny Research axes and conclusions, S. Erpicum & J.-L. Boillat Author index