Labyrinth weirs with square shapes and different crest designs were tested in experiments to see how well they handle water flow compared to traditional rectangular weirs. The study found that square labyrinth weirs with semi-circular crests performed better than those with sharp crests and rectangular weirs. The weirs with semi-circular crests had the highest discharge coefficient, showing they could handle high water flow efficiently. The height of the weir also affected performance, with lower ratios of height to width leading to better flow efficiency. Overall, the study showed that square labyrinth weirs with semi-circular crests are more effective at handling high water flow than traditional weirs.