New Stage–Discharge Relationship for Triangular Broad-Crested Weirs

Simple hydraulic structures, such as weirs, allow measuring flow discharge by using the upstream depth and a stage–discharge relationship. In this relationship, coefficient is introduced to correct all effects neglected in derivation (viscosity, surface tension, velocity head approach channel, turbulence, non-uniform profile, streamline curvature due weir contraction). paper, dimensional analysis incomplete self-similarity theory are used investigate outflow process of triangular broad-crested characterized different values ratio between crest height p channel width B, theoretically deduce new A theoretical relationship suggested for free-flow condition, it tested experimental data available literature condition p/B > 0. The obtained equation, low errors estimate, useful laboratory field investigations. Finally, specific weirs with 0 was developed modify case = This allows reduce errors, which generally less than ±5%, estimate also applicable