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When will yaoyao Reservoir begin to clear mud?

may 18th, 223. The dredging of yaoyao Reservoir began on May 18th, 223. Yaoyao Reservoir is located in the upper reaches of Xingzi River, a first-class tributary of Yanhe River in Ansai District of Yan 'an City, about 65 kilometers away from the lower reaches of Yan 'an City, with a drainage area of 82 square kilometers above the dam site.