Brief introduction of Shuangfengsi reservoir in Chengde

The total duration of the project is 3 years. The total investment is 3.6 billion yuan. The project includes barrage, spillway, spillway bottom hole, hydropower station, etc. The designed maximum dam is 533m long and 50. 1 m high. The construction of Shuangfengsi Reservoir in Chengde will improve the flood control capacity of Chengde city from the current 20-year return period to 100 return period. Fundamentally solve the flood control problems of central cities and world cultural heritage; It will greatly improve the water storage and supply capacity and provide reliable guarantee for urban production, life and ecological water use; Improve water conservation and water resources allocation capacity. It is of great significance to improve the local water environment and the water use conditions of residents and industries in Chengde. The flooded area of Shuangfengsi Reservoir in Chengde will involve 8 administrative villages: Shangwopu, Xinfangzi, Xia Nanshan, Donghuang, Li Ying, Dongkan, Xikan and Dianzi. After taking protective measures, the resettlement problem can be solved. After the protection, the reservoir inundation affected six administrative villages. The total submerged area is 16575 mu, affecting 2322 households, and it is planned to resettle 5 105 people. Demolition of 220,000 square meters of various houses. Road rerouted 10.9 km, and railway rerouted 6.4 km. At present, the total static investment of Shuangfengsi Reservoir in Chengde is 3.6 billion yuan, including 864 million yuan for reservoir inundation compensation, 0.3 million yuan for soil and water conservation project and 0.6 million yuan for environmental protection project.

According to the sewage pump company, Shuangfengsi Reservoir is located on the main stream of Wulie River, a first-class tributary of Luanhe River, and the dam site is located near Xiaomiaozi Village in Shuangfengsi Town, which is 12km away from the downstream Chengde City. The total storage capacity of the reservoir is 65,438+37 million m3, the normal water level is 389m, and the total area of submerged land is 884.87hm2, including 605.2hm2 of cultivated land and 5 105 migrants. The reservoir control basin covers an area of 2,303 square kilometers, accounting for 89% of the total basin area of Wulie River.

The construction of Shuangfengsi Reservoir can effectively solve the problem of insufficient flood control capacity in Chengde City, and raise the flood control standard from once every 20 years to once every 100a. At the same time, it can provide a clean and reliable water source for urban life and industrial water in Chengde, ensure the safety of urban water supply, replenish water for the summer resort lake area and urban environment, enhance the image of a famous historical and cultural city, and realize sustainable economic and social development. However, the construction of the project will inevitably have some adverse environmental impacts, so it is necessary to do a good job in environmental risk analysis, risk assessment and study risk response measures.

The total construction period of Shuangfengsi Reservoir is 3 years, with a peak of 5070 people. According to the domestic water consumption index of 80L/ person d, the sewage discharge accounts for 80% of the water consumption, and the domestic sewage discharge reaches1100m3/d during the construction peak period. In order to reduce the impact of sewage discharge on the water environment, an oil separation sedimentation tank is set up in the living area, and the sewage after oil separation is transported to the underground micro-power sewage treatment by the sewage pump.

Considering that there are drinking water sources in Chengde City downstream of the project construction area, in order to avoid the impact of accidental discharge on the water quality during the project construction, accident pools are set up at the main sewage discharge points to prevent the sewage discharge from getting out of control.

During construction, construction machinery noise, aerodynamic noise, electromagnetic noise and explosion noise pollute the surrounding environment. In view of these pollutions, the following control measures can be taken to reduce noise pollution: (1) Set up a closed mechanical shed for mechanical equipment with strong noise; Choose low-noise mechanical or noise-reducing equipment; Reasonable arrangement of construction time, try to avoid construction at night; Strictly control the man-made noise at the scene and enhance the awareness of noise prevention and nuisance; Long-term monitoring of site noise, special personnel management, and make records.

Dust and toxic gases discharged from construction sites pollute the surrounding environment. First of all, a fence not less than 1.8m should be set on the periphery of the construction site to avoid or reduce the outward diffusion of pollutants; The main roads on site must be hardened, covered, solidified, afforested and watered. Effective measures must be taken to strictly control the generation and emission of toxic and harmful gases on site; Fine-grained materials such as cement that are easy to fly should be sealed and stored; Earthwork and muck transportation shall be sealed; Used in on-site boilers, tea stoves, large stoves, etc. Smoke and dust removal equipment must be set up; When asphalt is moisture-proof and waterproof, closed heating equipment with smoke and dust removal device must be used.

Reservoir construction needs certain oil and blasting equipment, and the transportation and temporary storage of oil and blasting equipment will have certain environmental risks. When transporting blasting equipment, vehicles must meet the safety requirements of the relevant national transportation rules, and the goods should be packed firmly and tightly; Do not mix explosives and detonators; During blasting operation, the blasting safety operation rules must be observed. Transport vehicles carrying oil must use oil storage tanks with good sealing performance to ensure that they will not cause harm to the environment.