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ICID Heritage Irrigation Structures

UNDER CONSTRUCTION

 

DONGFENG WEIR

 

Dongfeng Weir in south-west China, built in 1662 as the early time of Qing Dynasty, is a masterpiece of historic irrigation development and the greatest work of diversion irrigation without dams along the Qingyijiang River as the tier 3 tributary of Yangtze River.

Dongfeng Weir, China

Dongfeng Weir is located on the Jiajiang County of Sichuan Province at the lower reach of Qingyijiang River, where the river starts to enter this county. As such, the premise enjoys natural advantage gravity water diversion. To divert water from the river, it necessary to cut a water inlet in the first place. According to this special geological and hydropower condition, in 1662, the county magistrate Wang Shikui led the construction of Dongfeng Weir. Dongfeng Weir, as the water inlet, was made of bamboo baskets filled with cobbles and earth-rock from local mountains at that time. The whole site has remained in use continuously for 350 years and experienced twice recondition on a large scale and the move of the water inlet for 3 times pursuing more sufficient water supply. The several changes of the site of the water inlet have made sure that only the surface water of Qingyijiang River is diverted. In this way, the water flow is increased, sediment is reduced, and ecological and water-soil conservations are achieved. In addition, the whole project consists of a continuous group of the 12 km main diversion canal, two secondary canals diverting into 4 by-canals, one tunnel, 11 aqueducts, 21 water-gates and other supporting facilities. The main diversion canal is connecting 10 previous micro canal systems, which the net of canals goes through Jiajiang County.

 

The irrigated area is about 5113 ha land-farm covering 4 towns and 48 villages. Since the completion of the project in 1662, its irrigated area has expanded by more than 10 times from 467 hectares to 5113 hectares, covering over 4 towns and 48 villages. The local multiple cropping index has increased to 2.68, and the cultivated area to 13367 hectares.

 

Dongfeng Weir was a water works that the local government of Qing Dynasty built in its rear for the purpose of the sufficient, reliable and sustainable irrigation water supply. However, nowadays it has a combined function of irrigation, drainage, urban flood control, and environmental water.

 

The resident people were charge of the whole projects before the foundation of the People's Republic of China (PRC). Nowadays, Dongfeng Weir is managed by the local government and the resident. The administrated offices charge of the maintenance of the general canals and branch canals, meanwhile the water user association, in the village as a unit, is responsible for the sub-lateral canals. Otherwise, during the peak of irrigation water, there exists another 4 water coordinating groups for coordinate water supply and water between the office and user, even among the users.

 

After the preparation for HIS, The nominated site and its extensive irrigation land are protected and managed by planning controls from local government.

 

Overall, it has made great contribution to irrigation farming, ecological conservation, and economic development along Qingyijiang River.

 

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HIGHLIGHTS

People's Republic of China

[ National Committee ] [ Wikipedia ]

Province: Jiajiang County of Sichuan
N29。47’10” E103。29’58
Built: 1662
Status: In use from last 350 years
River: Qingyijiang River
Irrigated area: 5113 ha
 
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