As the high head, high velocity and large flow of flooddischarge, the concrete of spillway tunnel in Xiaowan Hydropower Station is easy to be damaged by cavitation.
小湾水电站泄洪洞在泄洪时具有高水头、高流速、泄量大的特点，对混凝土冲刷力强，容易产生空蚀破坏。
3
It is showed that the appropriate design for inlet elevation, diameter and planar situation of a flooddischargetunnel is the key to the sedimentation engineering design for a reservoir.