In 937，the Chatan Dam was built in the upper reaches of the Niuhou River in Taihe county，that intercepts the flow of water，and an arc-shaped diversion section was excavated.Under the action of the water flow movement of the curved channel，the irrigation canal draws water from the front and the dam overflows from the side.In order to provide agricultural water and river ecological water for the downstream river，a small stone dam was built at downstream from 3.5km the Chatan Dam.In addition，mountain forests and fields are purchased as maintenance materials and management funds for the Chatan Dam.A set of management systems has been gradually established，including village gentlemen and beneficiary farmers.After more than a thousand years，the Chatan Dam has been continuously repaired and renovated，and now the farmland is irrigated more than 3000 hm2.The ancient dam is a representative project of agricultural irrigation in China，and is an outstanding example of harmonious human with water and was successfully selected for the World Irrigation Project Heritage in 2016.