Keynote lectures History and development of Piano KeyWeirs in Vietnam from 2004 to 2016 M. Ho Ta Khanh Twenty years of research in Biskra University for Labyrinths and Piano KeyWeirs and associated fuse plugs A. Ouamane, M. Debabeche, F. Lempérière & J.P. Vigny Hydraulics of Piano KeyWeirs: A review S. Erpicum, P. Archambeau, B. Dewals & M. Pirotton Overview of design and construction of 11 Piano KeyWeirs spillways developed in France by EDF from 2003 to 2016 F. Laugier, J. Vermeulen & B. Blancher I Research and development I.1 Hydraulics Research on Piano KeyWeirs capacity for free and submerged flows H. Nguyen Thanh, T. Tang Duc & M. Ho Ta Khanh Flow regimes over trapezoidal Piano KeyWeirs A. Mehboudi, J. Attari & S.A. Hosseini Synthesis of Piano KeyWeir experimental studies at LNHE G.M. Cicero, F. Laugier & J. Vermeulen Study of the influence of submergence on the upstream flow of Piano KeyWeir F. Belaabed, B. Athmani, A. Ouamane &A. Laiadi I.2 Geometry The effect of the geometric shape of the alveoli on the performance of Piano KeyWeirs A. Laiadi, B. Athmani, F. Belaabed &A. Ouamane Numerical investigation of wall thickness influence on Piano KeyWeir discharge coefficients: A preliminary study F.L. Bremer & M. Oertel Experimental study of discharge coefficient of a Piano Key SideWeir M. Karimi, J. Attari, M. Saneie & M.R. Jalili Ghazizadeh I.3 Fluid-structure interactions and aeration Fluid structure interaction of Piano KeyWeirs F.J.M. Denys, G.R. Basson & J.A.v.B. Strasheim Design of a Piano KeyWeir aeration network J. Vermeulen, C. Lassus &T. Pinchard Could Piano KeyWeirs be subject to nappe oscillations? M. Lodomez, M. Pirotton, B. Dewals, P. Archambeau & S. Erpicum I.4 Energy dissipation Toe-scour formation at Piano KeyWeirs M. Pfister, S. Jüstrich &A.J. Schleiss Experimental study for energy dissipation using stilling basin downstream of Piano KeyWeirs type A H. Truong Chi & M. Ho Ta Khanh I.5 Future applications and developments Piano Key and LabyrinthWeirs at German waterways: Recent and future research of the BAW F. Belzner, J. Merkel, M. Gebhardt & C. Thorenz Piano KeyWeir as overflow on sedimentation basin of wastewater treatment plant J.-M. Ribi, B. Spahni, D. Dorthe & M. Pfister Physical modeling size-scale effects for labyrinth weirs with half-round crests B.P. Tullis, N. Young & B.M. Crookston II Projects II.1 Studies A Piano KeyWeir to improve the discharge capacity of the Oule Dam spillway (France) S. Erpicum, P. Archambeau, B. Dewals, M. Pirotton, H. Tralli & J. Alende Piano KeyWeirs on a lateral spillway: From an analytical preliminary design to a detailed design validated by a physical model A. Chapuis, M. Thomas, L. Deroo, C. Richit & C. Touzet Estimation of discharge coefficient and optimization of Piano KeyWeirs K. Azizi, J. Attari &A. Moridi A comparison of side weirs and labyrinth weirs at Ilmenau river M. Gebhardt, J. Merkel, F. Belzner & C. Thorenz II.2 Construction The raising of Hazelmere Dam by means of Piano KeyWeir D. Booyse Construction and testing of two Piano KeyWeirs at Charmines dam P. Valley & B. Blancher Construction of a Piano KeyWeir spillway at La Raviège dam M. Cubaynes, F. Laugier &V. Nagel Construction of a Piano KeyWeir spillway at Record dam F. Dabertrand, J. Vermeulen & B. Blancher Study, design and construction of the Van Phong Piano KeyWeirs Q. Dinh Sy, A. Nguyen Luong & H. Nguyen Manh Adoption of a type D Piano KeyWeir spillway with tapered noses at Rambawa Tank, Sri Lanka H.M. Jayatillake & K.T.N. Perera