Research on construction of flood detention reservoir for flood control of small mountainous basin

Due to limited river flood discharge capacity of river channel,building a flood control reservoir is one of major structural measures to mitigate flood disasters.However,building a traditional flood control reservoir in a small mountainous basin often involves many limiting factors of reservoir site,dam site,cost,resettlement,ecology,etc..In the light of the characteristics of sharp flood rise and down,high flood peak and small flood volume,we propose to construct flood detention reservoir which does not store water in usual period,but detent flood in the period of torrential flood.On the basis of analysis on the maximum safe discharge capacity of downstream river channel and the operation characteristics of a flood detention reservoir,we put forward the requirements of reservoir site and type selection,the determination method of the major dam size of flood detention reservoir.The flood detention reservoir has obvious functions in flood peak discharge reduction and will play an important role in mountain torrents disaster prevention in small mountainous basins.