The worst hit location was Zhugqu County, where mud submerged houses and tore multi-story blocks of flats to pieces. The seat of Zhouqu County was densely populated, with 50,000 people (42,000 of them are permanent population) and an area of 2 km.[12] After the heavy rain, there was a buildup of water behind a dam of debris blocking a small river to the north of the city of Zhugqu; when the dam broke, around 1.8 million cubic metres of mud and rocks swept through the town, in a surge reported as up to five storeys high, covering more than 300 low-rise homes and burying at least one village entirely.[13][14] The mudslide left an area 5 km long, 300 meters wide in average leveled by mud with average thickness of 5 meters.[15][16]
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