ABSTRACT
ABSTRACT: Xiashan Reservoir is a large reservoir lies in Weifang City, Shandong Province. With the development of economy and society, the deficit in water resource has increasingly arisen in many cities, such as Weifang City. Considering thoroughly the uncertainties of flood, wind, storage volume and discharge capacity, the overtopping risk analysis for earth or rockfill dam against the simultaneous actions of flood and wind wave during flood period has been established in the paper and then its application to Xiashan Reservoir is described. By taking 10−6 as acceptable risk, or 99.999% as acceptable reliability, the result of risk analysis show that the earth dam of Xiashan Reservoir is very reliable against the design series of flood events accompanied with the runup generated by wind wave during flood period. Besides, in order to efficiently utilize the valuable water resources (including flood period) upstream of the reservoir, on the basis of risk analysis, we recommended that its designed limiting reservoir level before flood, say 37.4 m, may be safely raised to an new elevation of 38.0 m. The correspondent increment of water volume should be 7765 × 104 m3. It would bring a great deal of direct benefits and social benefits.
