Side weirs are structures used to divert water in various systems. A new type called trapezoidal piano key side weirs (TPKSWs) were studied in a curved channel. The researchers found that the shape and size of the TPKSWs affect how much water they can handle. They discovered that the angle of the bend in the channel has the biggest impact on how well the TPKSWs work. In fact, TPKSWs were found to be much more efficient than traditional linear rectangular side weirs (LRSWs) in curved channels. TPKSWs with a wider total width were even more effective due to increased secondary currents. Overall, TPKSWs are a promising option for managing water flow in curved channels.