66 Reservoirs Discharging; Cities Severe Flooding | Many Dams Burst

Following the July 20th mega-flood in Zhengzhou City caused by the release of the upstream Changzhuang Reservoir, the flooding in Henan province continues. The city of Xinxiang, located 65km northeast of Zhengzhou, was particularly impacted when the Wei river’s embankment was breached. According to Chinese media reports, as of 8:00am on July 22nd, Henan Province has 66 large and medium-sized reservoirs over the flood limit. Several reservoirs were in dangerous situations, such as dam floods and pipe surges. To ensure the safety of the reservoirs, several large and medium-sized reservoirs such as Zhao-ping-tai, Ya-he-kou, Zhao-wan, and Xiao-nan-hai were released. The capacity of these large and medium-sized reservoirs are all greater than 100 Million Cubic Metres. A large number of floods caused many rivers to burst their banks, and the resulting floods caused serious disasters in Henan Province. Officials reported that as of 4:00am on the 22nd, 3 million people were affected in Henan province, 33 people died and 8 people were missing, and a total of 376,000 people were transferred to emergency shelters. Why is it that when it rains heavily, reservoirs all over the country are discharging flood water, aggravating the situation? Isn't one of the purposes of building reservoirs to prevent floods and fight droughts? Especially now when there are so many weather satellites with more accurate forecasts, why don't these reservoirs empty their water beforehand and play their role in flood prevention?
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