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永定河为海河水系五大河流之一。上游为桑干河,源出山西省管涔山,沿东北流至河北省入官厅水库。在怀来县官厅以下称永定河。1970~1971年,在下游屈家店水闸(永定河与北运河汇合处)以下,另辟全长约61km的人工河,称永定新河,以分泄汛期流入海河的流量,为整治海河工程之一。永定新河开挖底宽200m,顶宽260m,主槽
Yongding River is one of the five major rivers in the Haihe River system. The upper reaches of the Sanggan River, the source of Shanxi Province, Guan Yu Shan, northeast flows into Hebei Province into the government hall reservoir. In Huailai County Hall called Yongding River. From 1970 to 1971, an artificial river of about 61km in total length was constructed under the sluice of the Qujiandian sluice (junction of Yongding River and North Canal) downstream of Yongding River to divert the flow of water flowing into Haihe River during the flood season to rectify the Haihe River Project one. Yongding new river excavation bottom width 200m, top width 260m, the main groove