<keynote> Hydraulic desilting of reservoir in Taiwan

Abstract

Reservoirs in Taiwan encounter seriously sedimentation problem due to numerous sediment yield production in the watershed during typhoon event. It is estimated that 0.96% of water storage volume is lost annually, siltation result of the upstream river flow carries large amount of sediment from the watershed during floods. To mitigate the sedimentation problems in several major reservoirs, a series of desiltation measures have been conducted to slow down sedimentation and sustain the life of reservoir. Hydraulic desilting is the most effective and economical way to releasing sediment in reservoir, this paper summarized hydraulic desilting projects of Shihmen, Agongdian and Zenwen reservoir in Taiwan, and among of which, abundant sediment was released by desilting operation through the sediment outlet into the downstream river during typhoon.