Baiyantan Reservoir Project is located in Fengcheng Town and LAM Raymond Township in the southwest of Xuanhan County. It is an important backbone water source project in the northeastern marginal mountainous area of Sichuan. It is about 85 kilometers away from Xuanhan County, and the county-level highway goes directly to the work area, with convenient transportation. The controlled watershed area above the reservoir dam site is 1 10 km2, and the river length is19.2km.. The dam site is located on the submerged river in the middle and upper reaches of Luanshitan River, a tributary on the left bank of Houhe River in Qujiang River system. Luanshitan River originates from Baima Township, Xuanhan County, flows through Guanshan and Qingxi Township from northeast to southwest, and joins Houhe River at Qingxikou, with a total length of 46 kilometers and a drainage area of 268 square kilometers.

The water resources in Xuanhan County, Daxian County and Tongchuan District, where Baiyantan Irrigation District is located, are unevenly distributed in time and space, with frequent floods and droughts and weak existing water conservancy facilities, which seriously restricts the social and economic development in this area. The construction of Baiyantan Reservoir is an important measure to improve the comprehensive agricultural production capacity, solve the "three rural issues", promote the coordinated development of urban and rural areas, and improve people's production and living conditions. It is very necessary and urgent to promote the sustainable development of economy and society in this region. The development task of Baiyantan Reservoir is mainly irrigation, which has both flood control and rural domestic water supply, and also serves as an emergency standby water source for Xuanhan County and Dazhou City.

The irrigation area of Baiyantan Reservoir Project is mainly distributed in the downstream of the reservoir 176.07 km2, involving 2/kloc-0 townships in the southwest of Xuanhan County, such as Fengcheng, LAM Raymond, Huangjin, Puguang, Tangjun, Liuchi, Yue Ming, Dacheng and Hu Jia, and 4 townships in Tongchuan District, with a designed irrigation area of 29. At the same time, it will solve the domestic water problem of 435,800 rural people in the irrigation area and improve the flood control standards in the downstream.

The project includes Baiyantan reservoir hub project and irrigation area project. The construction scale of the hub project is: the normal storage level of the reservoir is 73 1.00m, and the storage capacity of the normal storage level is 59.83 million m3; Dead water level of 680.00m, dead storage capacity of 3.92 million m3; The design flood level is 732.06m, the check flood level is 733.75m, the total storage capacity is 65.57m 3, the storage capacity of Li Xing is 53.63m 3, and the maximum dam height is 94.20m m. The general layout of Baiyantan Reservoir Project is: left bank spillway tunnel, left bank surface spillway tunnel, retaining dam (concrete face rockfill dam) and right bank diversion tunnel. The main buildings are concrete face rockfill dam (dam height 94.20m, dam length 260.87m), spillway (tunnel length 600m), emptying tunnel (tunnel length 695m) and diversion tunnel. The irrigated area is 298,000 mu (including improved irrigated area 1 10,000 mu), of which: cultivated land is 6,543.8+0,504 mu, and the current ratio of cultivated land to soil is 57: 43. The irrigation channels of Baiyantan Reservoir are divided into hub water intake project, two branch canals in irrigation area, right main canal (including Pujia (Wei) branch canal) and left main canal (including three branch canals) of Houhe right main canal, in which: total main canal length 1.350km, left main canal length 18.65438+. 14 total length of branch canal 135.92km, total length of canal 190.826km, head flow of main canal10.8m3/s.

According to Classification and Flood Standard of Water Conservancy and Hydropower Engineering (SL 252-2000), the reservoir hub of this project belongs to Class III project with medium scale, and the corresponding canal system buildings belong to Class III project. The main buildings are concrete face rockfill dam, surface spillway tunnel, spillway tunnel and water intake tunnel, and the main buildings are of Grade III. Because the dam height of concrete face rockfill dam is more than 70m, according to Classification and Flood Standard of Water Conservancy and Hydropower Engineering (SL 252-2000), the grade of concrete face rockfill dam is upgraded from 1 to Grade 2, and the grade of secondary building is Grade 4. According to the relevant provisions of Code for Design of Irrigation and Drainage Engineering (GB 50288-99), the main buildings of canal system engineering should be Grade IV; The secondary building is level 5. According to the Seismic Parameter Zoning Map of China GB 18306—200 1, the basic seismic intensity in the working area is VI degree. According to DL/T5335—2006 Technical Specification for Investigation of Regional Structural Stability of Hydropower and Water Conservancy Projects, the regional structural stability is good.

The total construction period of Baiyantan reservoir hub project is 42 months, and the total construction period of channel project is 6 months, excluding the preparation period, which is 48 months. After calculation, the static total investment of the project is 13 1522000 yuan, and the total investment is 13 1522000 yuan (including 6576 1000 yuan invested by the state; The provincial investment is 263.04 million yuan; Cities and counties invested 394.57 million yuan). Among them, the static total investment of reservoir part is 458.93 million yuan, the total investment of resettlement part is168.5 million yuan, and the static total investment of channel part is 687.79 million yuan.