Yilan River Mouth Introduction
The spillway is used to discharge excess water from Sun Moon Lake into the Shui Li Creek. Residents near Sun Moon Lake refer to it as the "Tianjing." The spillway is shaped like a circular tower, as circular shapes allow for faster water flow. The circular tower-shaped spillway is set to maintain a fixed water level; when the water level is normal, no water flows into the tower. Once it exceeds the full water level, it automatically flows into the spillway for discharge. The spillway is a funnel-shaped structure with a diameter of 24.39 meters that gradually narrows from top to bottom, connected to a tunnel with an inner diameter of 3.48 meters and a total length of 219.93 meters. To adapt to the complex terrain, the tunnel and channels take on many shapes, which is one of the reasons it was considered the "largest hydropower project in the East" at the time and remains a wondrous attraction today. Visitors walking the Wushe to Xiangshan Trail should not forget to pause and take a look at it.
