Side weirs are used in water systems to divert flow. A study looked at a special type of side weir called a semi-circular labyrinth side weir. They found that this type of weir can handle more water compared to regular side weirs. By testing different heights and sizes, they discovered that the shape of the weir affects how much water it can handle. The researchers came up with equations to predict how much water a semi-circular labyrinth side weir can handle based on its dimensions and the flow conditions. This type of weir is good for increasing water flow in channels.