Xidayang Reservoir (Chinese: 西大洋水库[3]), also known as Xidayang Shuiku[4] or West Dayang Reservoir,[5] is a large-scale reservoir[6] located in Baoshui Township, Tang County, Baoding City, Hebei Province, China.

[7] West Dayang Reservoir was designed by the Design Institute of Hebei Provincial Water Resources Department (河北省水利厅设计院), [8] its construction began in 1958[9] and was completed in 1960.

[10] In August 1970, the continued construction of the reservoir was completed.

[11] In 2005, Xidayang Reservoir's consolidating and de-danger engineering (除险加固工程) started, with a total investment of 198 million yuan and a construction period of 36 months.

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