Jinping Reservoir is a medium-sized reservoir with a total storage capacity of120,000 cubic meters. The completed reservoir hub consists of three parts: dam, water conveyance and flood discharge tunnel and emergency spillway. The dam is 38m high, with breakwater1.2m, crest width 6m and dam length110m. The water conveyance and flood discharge tunnel is a circular tunnel with D = 5m and a total length of 276m. The water inlet is a tower-type water inlet, and three flat steel gates are installed at the water inlet. Emergency spillway 1 seat, with a total length of 279.05 meters, has three functions: flood control and disaster reduction, agricultural irrigation and urban water supply. Agricultural irrigation design has an effective irrigation area of 20,000 mu, with an irrigation area of 1.4 million mu, providing urban water supply of 165438+ 10,000 cubic meters/year, supporting the sustainable economic and social development of Tongwei County and supporting the irrigation area and the people of the county.
There is a sparkling artificial lake in the west of Tongwei-Jingping Reservoir, which has been dry for nine years and the river has been cut off. From a distance, the dam stands tall and stands upright, blocking a hundred hectares of blue waves. The reservoir area is surrounded by mountains and waters. Blue sky and white clouds are reflected in the water, and green trees and grass are swaying on the shore, which is a pleasant scene of Gaoxia Pinghu. Especially after the rainstorm in summer and autumn, thousands of ditches and valleys fell from the sky, shaking the earth and rushing in. Here, they quietly gather to form a pool of water.
Jinping Reservoir is a water control project with the largest investment, the largest storage capacity and the most remarkable social and economic benefits in Tongwei County. It is also the only medium-sized reservoir in Dingxi City with the functions of water storage, irrigation and drainage prevention and urban water supply. Since it was built and put into operation for 30 years, it has delivered a steady stream of water for Tongwei agricultural production and urban and rural people's lives. It can be said that a hundred miles of wind and cloud converge into a library, and all rivers and rain melt into thousands of households.
Jinping Reservoir is located on Niugu River in the northwest of Tongwei County 16 km, with the dam site at Heiyao Gorge in Jinping Township and Hua Shuang Highway passing through from the east. The project started on 1972, and the main project was basically completed by the end of 1975, and the water was sealed in September of the same year. The above can control the watershed area 19 1 km2. The reservoir hub project consists of two parts: dam and water conveyance and flood discharge tunnel. The dam is a clay dam with red clay core wall, with a height of 37m, a crest length of 105m and a dam width of 6m. The water conveyance and flood discharge tunnel is located on the right bank, with a total length of 276.4 meters and a diameter of 5 meters, all lined with reinforced concrete. The maximum flow is 270 cubic meters. The lifting equipment is a 60-ton crane.
1979, Jinping Reservoir completed the lining project of the water conveyance and flood discharge tunnel with a length of164m, replaced and installed the hoist, and started some experiments such as "livestock cleaning and flood discharge", and achieved scientific research achievements of "advanced in the province" and "relatively advanced in China". On June 26th, 1980, due to the loss of control of the water storage and flood discharge gate of Jinping Reservoir, the reservoir was emptied and the water level plummeted, resulting in serious landslide of the upstream dam slope. In this regard, the state has invested 6.5438+0.37 million yuan to repair and strengthen the dam. All the water conveyance and flood discharge tunnels are lined with reinforced concrete, the surrounding rock is consolidated and grouted, and the gate is overhauled, so that the service life of the reservoir is extended from the original design of 15 to 125. 1982 10, Jinping Reservoir was awarded "providing an example for Tongnei Reservoir" by the Provincial Water Resources Department.
Because the original project was built during the Cultural Revolution, the flood control standard was low, there were many hidden dangers, the operation was difficult, and the benefits could not be brought into normal play. 1in may, 1994, the provincial water resources department approved the reinforcement project of Jinping reservoir. The project started construction in September 1996 and was completed in October/2003, with a total investment of11476,700 yuan. The project has improved the flood control standard of the reservoir, and the nuclear flood has been increased from once in 500 years to once in 1000, and an extraordinary spillway tunnel with a total length of 279 meters has been added, so that the flood discharge capacity of the reservoir has been increased to 7 10 cubic meter on the original basis. At the same time, the automatic observation and dispatching system of the reservoir is built, which realizes the automatic monitoring of the reservoir, thus realizing the automatic management of the engineering safety prediction and the reasonable optimal dispatching operation of the reservoir. After a series of reconstruction and construction, Yin Ping Reservoir has formed a scale and capacity with a total storage capacity of 65,438+200,000 cubic meters, an effective irrigation area of 20,000 mu and an irrigation protection area of 65,438+300,000 mu. From June 5, 2000 to 10, the water supply project of Jinping Reservoir, which lasted for 4 years, was completed and put into operation. In the project, a pressure pipeline15km has been laid, and a water plant with daily processing capacity1600t has been built, so that residents in the urban area and its vicinity can use clean and sweet tap water to solve the long-term water shortage problem. Throughout the construction process of Jinping Reservoir, * * * has gone through three main stages. The first stage is project preparation and preliminary construction. 1958 65438+ 10, Tongwei County Committee and Dingxi Agricultural Construction Bureau * * * conducted the first survey and planning of Niugu River Basin, and in May, they put forward the Planning and Design Report of Niugu River Basin. 1959 10, the reservoir construction headquarters was established, and construction started in 12. However, due to hunger and other reasons, 120 migrant workers died, and the project-1960 stopped in May, which lasted for half a year. The second stage is the construction of the main body and supporting projects. 1972, under the background of the national implementation of Chairman Mao's strategic policy of "digging deep holes, accumulating grain and not seeking hegemony, and food is the first thing for the people", the production headquarters of Gansu Revolutionary Committee approved the design task book of Jinping Reservoir in Tongwei County. In June+10, 5438, the construction of Jinping Reservoir was started for the second time, and the reservoir construction engineering headquarters was established. At the same time, the First Corps of Gansu Water Conservancy and Electric Power Survey and Design is responsible for the initial expansion design. Thousands of builders from government agencies all over the county focused on Heiyao Gorge and launched a campaign to develop water resources under the slogan of "Fighting Heaven and Earth" and "Man can conquer Heaven". After three years of hard work, the reservoir was completed and closed on September 1975. The third stage is the maintenance, reinforcement and reconstruction of the reservoir. During the more than 20 years from June 65438 to June 0980, many large-scale reinforcement and technical transformation of equipment were carried out, which greatly improved the flood control standard and benefit level of the reservoir. In particular, the completion of urban water supply projects has broadened the service function of reservoirs, realized the diversification of water resources development and utilization, completely changed the pattern that reservoirs only serve agriculture, and realized the transformation from traditional water conservancy to modern water conservancy.
The construction of Jinping Reservoir has made great contributions in the contemporary era and benefited for a hundred years. With the passage of time and the development of history, it will bring greater benefits to Tongwei people and play a greater role in the development of industry and agriculture and the improvement of people's living standards in this area.