After storing water and sediment for several months, Sanmenexia Reservoir in the middle reach of the Yellow River suddenly released water on June 25, 1993. Hyperconcentrated flow was created with a maximum flow discharge at 1,480 m3/s，and the sediment concentration was measured to be 300 kg/m3 for about 24 hours! The water surface elevation dropped from 307.5 m to 294.25 m in the reservoir. This video shows as the bank collapsed, sand and silt falling into the water and develop the hyperconcentrated flow. The hyperconcentrated flow form a channel inside reservoir, and then traveled through the spillway to the downstream. You can also hear the hydraulic engineers discussing the how the channel inside the reservoir developed, as well as the hyperconcentrated flow as they took the video of the bank failures.
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