Optimum Design of Flood Tunnel of Goupitan Hydropower Station

In order to meet the requirement that the station is put to operation on an earlier date in December,2008,the layout of flood tunnel was specially been researched combined with the status of the geological conditions of the flood tunnel and its construction.The results made known that the construction period for dam in flood season of 2008 after gates of diversion tunnels were closed in 2007 could be added two months under the conditions that the bottom elevation of the flood tunnel inlet is cut down to 550 m and the empty orifices on the bottom of the dam take part in the river diversion at that time.