The study looked at how changing the sidewall angle of a trapezoidal labyrinth weir affects the flow of water over and through the structure. By testing 15 physical models, researchers found that adjusting the angle can impact the discharge coefficient, which determines how much water can pass through the weir. They also developed design curves for different shapes and configurations of the compound trapezoidal labyrinth weir. The main goal was to figure out the discharge coefficient for flow over this type of weir, comparing it to a compound linear weir. The findings suggest that changing the sidewall angle can affect the efficiency of the weir in regulating water flow.