Calculation of Design Flood for Small Watershed Reservoir in Karst Mountain Area——a Case Study of WL Reservoir
In order to scientifically and reasonably determine the design flood of the small watershed reservoir in karst mountainous areas,taking WL reservoir as the research case,the design flood was calculated according to the whole basin method and the separate superposition method respectively,considering the distribution of the underground river area and open-flow area upstream of the dam site.The recommended design flood process for the dam site was determined through comprehensive comparison.The results showed that the design flood calculated by the separate superposition method was close to the historical flood survey results at the downstream of the dam site.It could reflect the actual situation of the flood regulation at the dam site by the underground river area,coordinate with the existing flood results in the region,and recommend the design flood result for the dam site of WL Reservoir.The method and results can be used for reference to guide the design flood calculation of reservoirs in regional karst mountain areas.
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