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The post-earthquake debris flows in the Wenjia Gully led to the exposure of the shortcomings in the design of the original conventional debris flow mitigation system. A predicament for the Wenjia mitigation system is a large amount of loose material (est. 50 × 106 m3) that has been deposited in the gully by the co-seismic landslide, providing abundant source material for debris flows under saturation...
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