has it experienced any natural calamity?
Yes, there are frequent major landslides and river  flooding.
Three Gorges Dam
 frequent major landslides 
where is the largest dam in the world located It spans the Yangtze River by the town of Sandouping, in Yiling District, Yichang, Hubei province, central China, downstream of the Three Gorges.
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Three Gorges Dam [SEP] Landslides
Erosion in the reservoir, induced by rising water, causes frequent major landslides that have led to noticeable disturbance in the reservoir surface, including two incidents in May 2009 when somewhere between of material plunged into the flooded Wuxia Gorge of the Wu River. Also, in the first four months of 2010, there were 97 significant landslides.