Abstract:

There are a lot of studies related to the rectangular and triangular side weirs located on straight channels. The most of these studies are generally related to discharge coefficient and water level surface of these side-weirs. In this study, the labyrinth weirs have used instead of sharp crested side weirs. A labyrinth weir is defined as a weir crest that is not straight in planform. The increased sill length provided by labyrinth weirs effectively reduces upstream head for a particular discharge. They can therefore be used to a particular advantage where the width of a channel is restricted and a weir is required to pass a range of discharges with a limited variation in upstream water levels. A series of laboratory experiments were conducted in order to determine water surface profiles of the labyrinth side weirs at the straight channel for different labyrinth weir included angles, weir lengths, and crest heights. As a result, it is shown that water surface profile of the labyrinth side weirs is similar to that of classical side weirs. However, it is observed that vortex occurs over the labyrinth side weir for large Froude numbers.

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