Performance Comparison of Various Labyrinth Side Weirs

ABSTRACT Side weirs are used generally to divert flows from rivers, canals, sewers and reservoirs.There are many studies focused on triangular and rectangular side weirs situated on a straight channel. Some recent studies exist on labyrinth side weirs. In this study various labyrinth weir shapes are compared for coefficient of discharge and surface profiles. The study aims at finding out performance of the labyrinth side weirs using computational fluid dynamics. It is found that for subcritical flow in parent channel, surface profiles along the centerline shows no fall at the beginning of the weir and shows increase in depth along the length of weir opening. The performance of parabolic and triangular shape with included angle 60owas found to be almost similar.