Yishuitu

Nantou Attractions

Yishuitu Introduction

The overflow spillway is used to discharge excess water from Sun Moon Lake into the Shuili River. Residents near Sun Moon Lake refer to it as "Tianjing." The overflow spillway has a circular tower shape, as circular shapes allow for the fastest water flow; it is designed with a fixed water level so that when the water level is normal, the lake water does not flow into the tower. Once it exceeds the full water level, it will automatically flow 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, totaling 219.93 meters in length. To adapt to the complex terrain, the tunnel and channel change in various shapes, which is one of the reasons it was regarded as "the largest hydroelectric project in the East" at the time and remains a remarkable attraction today. Visitors walking along the Shuishe to Xiangshan Trail should not forget to pause and take a look.

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