Abstract: To study the impact of construction diversion and flood control schemes on the constructioncost, duration and construction safety of water conservancy and hydropower projects, this study takes ahydropower station in Hubei Province as the research object. By addressing the main issues involved inthe station's construction diversion and flood control schemes-including diversion tunnel diameter andflood control cofferdam scheme, flood regulating caleulations, economic comparisons, and comprehensiveanalyses are conducted to optimize and compare 5 construction diversion schemes and 3 cofferdam floodcontrol schemes. The results indicate that the scheme of one 8 m x 10 m diversion tunnel is optimal, ena-bling a cost saving of 20. 591 million yuan; the year-round high cofferdam with concrete cut-off wall +composite geomembrane inclined wall is also optimal. The research results can provide a reference forsimilar projects.

Key words: hydropower stations, concrete panel dams, construction diversion, flood control
measures;
optimization scheme comparison and selection