Abstract
This paper has studied the performance of different triangular labyrinth side weirs. To evaluate the effectiveness of the various schemes: triangulating, adding sloped floors to the cycles, apex overhanging, and changing to an asymmetry plan were experimentally investigated. Continuous improvement has been achieved in these examinations. The average increase of the discharge coefficients relative to the rectangular side weirs was 80, 82, 87, and 96% for triangular side weirs, triangular side weirs with sloped floors, triangular side weirs with sloped floors and overhangs, and asymmetric triangular side weirs with sloped floors and overhangs, respectively. Velocity components near side weirs also confirmed higher performance for the asymmetric plan. Two new equations have been presented to estimate the discharge coefficient of the two-cycle triangular side weirs and triangular side weirs with sloped floors and overhangs. The proposed equation for the triangular side weirs was supported by the present laboratory data, as well as data from other researchers covering different apex angles of 35°, 45°, 60°, 90°, 120°, and 140°. The study results can be used to design triangular side weirs for enhancing the discharge capacity where the channel bank is limited to pass the required flow rate.
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