ABSTRACT

Due to the growing population and the rapid industrial development in SouthernTaiwan, public water demand has progressively risen in recent years. The Twsengwen Reservoir Transbasin Water Diversion (TRTWD) project, commenced in 2005, aims at solving the water deficiency problem in Southern Taiwan by diverting surplus water from the Laonong River into the Tsengwen Reservoir during the raining season.As illustrated in Figure 1, the TRTWD project consists of 5 elements including (1) a diversion weir and intake structure on the Laonong River, (2) a 9.6 km long eastern diversion tunnel (E-Tunnel), (3) the Cishan River crossing engineering, (4) a 4.3 km long western diversion tunnel (W-Tunnel), and (5) an outlet structure on the Chaoiao Creek.