EXPERIMENTAL STUDY OF DIFFERENT SILL GEOMETRIES IN PIANO KEY WEIRS

Piano Key (PK) Weirs are non gated type of weirs with increased discharge capacity because of their increased plan length. PK weirs are better than other conventional types of weirs for applications where the channel width is restricted. These are cost effective hydraulic structures and can work efficiently at low heads also. In this pap er, two physical PK weir models with different sill geometries were tested; one with sloping sill and t he other with triangular sill. Based on the experimental results, it has been found that the discharge coefficient (C d ) for sloping sill and triangular sill are 0.243 and 0.264 respectively.