Traditional Culture Encyclopedia - Weather forecast - Construction process of Changtan Reservoir
Construction process of Changtan Reservoir
(1) establish a team of migrant workers.
According to the principle of convenient leadership, convenient work and convenient life, the mobilization department of limin was established under the construction Committee of Changtan Hydropower Station on Yongning River in Huangyan County to lead migrant workers. The subordinate organizations of the People's Power Mobilization Division are organized by militarization, with the people's commune (equivalent to the district) as the unit, the production brigade (equivalent to the township) as the unit, and the migrant workers' company as the unit. Every regiment 1000 to 1500, every battalion 300 to 500, and every company 100 to 120.
② Status of migrant workers
The age is 18 ~ 50 years old, and she is strong, and young women can account for 20%;
Non-members' land, wealth and opposition, as well as bad elements with current activities, were all rejected;
No infectious diseases, chronic diseases and mental diseases.
⑧ cadre allocation
Each migrant workers' group has a political commissar 1 name, a deputy leader 1 name, a clerk 1 name and a correspondent 1 name; Each battalion has 1 instructor, 1 deputy battalion commander, 1 clerical officer, 1 steward and 1 cultural teacher; Each company has an instructor and a company commander, as well as a clerk and recorder. Each platoon has a platoon leader and a monitor. In order to strengthen the political and ideological education of migrant workers and ensure the quality of the project, it is stipulated that cadres at or above the battalion level must be equipped with full-time party member cadres.
(4) Should bring tools and living arrangements.
Because the hydropower project is huge, it needs a lot of materials, and the market and national supply cannot be fully met, so it is necessary to carry small tools with you. Every three people in mountainous areas and mid-levels (Ningxi, Wuyan and Toutuo) take two baht hoes, each with a hoe, each with a rake and a hoe, each with a basket, a shoulder pole and a hook; In the plain area, every two people bring a rake, every three people bring a hoe, every five people bring a baht hoe, and each person brings a basket, a pole and a hook. If materials are damaged due to work, the construction site is responsible for repairing them. Everyone must take a pair of rain gear because of the light rain. Migrant workers must bring all cooking-related electrical appliances, be fully staffed with cooks (about 3% is appropriate), and start a business with the company as the unit, and each person should bring one month's rations and vegetables (about 4 yuan). Because the mountainous areas can't supply vegetables in large quantities, all districts should try their best to mobilize migrant workers to bring their own vegetables. Bedding, straw mats, straw mats and other daily necessities must be brought together. Cadres and cooks at or above the company level reported on September 29, and were responsible for arranging accommodation and living for migrant workers.
⑤ Distribution number of migrant workers
Toutuo 1000 people
Chengjiang and Chengguan 1500 people
Tongyu, Luqiao 1500 people
Xinqiao 1500 people
Jin Qing 1000 people
Top three 1000 people
Hongjia 1500 people
1958 10/0/0, when the dam foundation was cleaned, the county party Committee and the tunneling technicians dispatched 59 water pumps to Changtan, including 39 coal cutters and 20 diesel engines. 1October 30th, 136 Rock-breaking technicians went to Changtan; 1October 2 1 day, the second batch of migrant workers was notified; 1February 2, the actual number of pumps has reached 97. ① Dam type selection: Based on the principle of saving steel and cement and building hydraulic structures with local materials as much as possible, the factors of local materials were fully considered when drawing up the dam project of Changtan Reservoir. Due to the limitation of the types and reserves of soil materials around the dam site of Changtan Reservoir, only the mixed use of loam and gravel can be considered, and the structural form of the earth dam depends on the basic geology and construction conditions of the dam. According to drilling, the rock of dam foundation is buried deeply, and the overburden is more than 40 meters, which is formed by sand and gravel deposition. The permeability coefficient decreases with depth. The average permeability coefficient below the elevation of 0 m is 10 m/day, but the pavement is more permeable. Therefore, how to reduce leakage and prevent possible concentrated piping is obviously the key factor to consider dam type. In this way, the shell dam of clayey inclined wall gravel dam with blanket becomes the optimal design dam type finally selected. The mechanical and physical properties of the soil used for earth dam design are as follows: dry weight of sandy clay YD = 1.65t/m3, dry weight of loam yd= 1.6/m3, gravel yd =1.9t/m3; The optimum water content of clay and loam materials is determined by geotechnical laboratory tests of Hydraulic Research Institute.
② Dam foundation cleaning: 1958 1 October1day, the construction committee of Changtan Hydropower Station on Yongning River in Huangyan County issued the order to build Changtan Hydropower Station, and 1000-plus builders held a grand groundbreaking ceremony on the construction site to celebrate the ninth anniversary of the National Day. They held the banner of "Pioneers" and sounded magnificent gongs and drums in the desolate and gloomy valley with picks and hoes. The dam site of the reservoir is igneous tuff with well-developed joints. There are exposed rocks on the left bank and residual zones on the right bank, which are mainly composed of clayey sand. Weathered cuttings are 2 ~ 3m thick, with individual zones reaching more than 10m. River bed alluvium belongs to Quaternary gravel layer. It took the constructors only one month to remove impurities and topsoil by shoulder pushing.
③ Excavation and filling project: The construction of Changtan Reservoir is a struggle between man and nature, and the completion of Changtan Reservoir proves that man can conquer nature. Due to the low degree of mechanization and weak technical force at that time, large-scale open-air construction, whether digging or backfilling, encountered wind, frost, rain and snow, which affected the progress and quality of the project. Under the leadership of the Party Committee, driven by the goal of "building the Changtan Reservoir to benefit future generations", it was freezing in the cold, and people came and went, stripped off their clothes and went shirtless. Everyone contributes their wisdom and strength to speed up the construction and improve the quality of the project. Ordinary people show extraordinary genius in the process of fighting against heaven, and the selfless work of builders is even more beautiful. Advanced collectives and individuals such as "Eighteen Warriors", "108 General" and "Iron Girl Team" appeared on the construction site. The Project Construction Committee and the People's Mobilization Division seized the advanced models, commended the advanced in time by convening activists' congresses, promoted all migrant workers to learn from the advanced and strive for the upper reaches, and accelerated the progress of the excavation and filling project. The leaders of migrant workers gave their lives for their work, and they were often the first to go shirtless with straw ropes around their waist, such as Wang Xiutang of Chengjiang. At that time, the old migrant workers were still talking about his tiger power and enterprising spirit.
④ Cutoff wall: 1959 1 1 month, the sandy pebble dam shell of the reservoir barrage was partially completed. Because there is a strong permeable layer in the foundation, in order to make the dam stable and safe, it is necessary to change the foundation from blanket to two cutoff walls. The cutoff wall should be dug to the elevation of the Yellow Sea at least-3m. The deeper it is, the harder it is to dig. The amount of seepage is very large, reaching 2 cubic meters per second, and the work is very hard. Although there are 90 pumps 1000 horsepower on the construction site, if there is something wrong with the pumps, a water pool with a depth of one or two meters will be formed. In this cold winter, when the northwest wind is cold, the frost is all over the ground and dripping into ice, people still have to dive into the water to dig stones, and the water is still working on their shoulders. Due to the large amount of leakage, complicated geology, hard rock and low efficiency, the progress of the whole project has been seriously affected.
At that time, in order to pursue the progress, some people thought that the cutoff wall was insignificant and had to be backfilled before digging to the design depth. Engineers of Provincial Water Resources Department attach great importance to the quality of the project. He believes that this is a Millennium project, and there is no room for falsehood and carelessness, so people should continue to dig up design standards. Migrant workers can't accept it, but they still have to fill it out. Gao engineer stood in the pool full of ice water and shouted, "If you want to fill it, I'll fill it." People were shocked and moved by the loyalty and rigorous scientific attitude of senior engineers, and stopped backfilling one after another. Senior engineer immediately telegraphed Wu, deputy director of the Water Resources Department in charge of technical work. Deputy Director-General Wu was extremely anxious, so Ma Shang drove to find Huang and rushed to the scene, ordering further excavation and backfilling, so that the project could be carried out according to the standard.
People constantly sum up experience in practice and carry out technological revolution and innovation. If it is difficult to dig and fish for stones underwater, the gunner will dig after blasting in the water. The colder the weather, the greater the enthusiasm, and people come and go in the ice and snow. "Old people are like snow Marie Laure Gigon, and young people are like dragons", which is in full swing. The first cutoff wall is 360m long,10m deep, 50m wide and 8m wide at the bottom. 1959 1/excavated at the beginning of the month, 19601completed in the middle of the month. The second cutoff wall is 380m long,10 ~13m deep, 70m wide and 25m wide at the bottom. It was excavated at the end of 19591February and completed in the middle of February 1960. Both cutoff walls are backfilled with clay.
⑤ River closure: In the whole huge project of building Changtan Reservoir, the moment before river closure is the most tense, intense and arduous. Damming is an organized and disciplined battle for time and speed, and it is also the only battle in Huangyan history in which people cut off Yongning River with their bare hands. No one has ever seen how to close the dam of such a large reservoir. When the rainy season comes, the flood threatens the safety of the dam. If there is a serious flood, the existing embankment will be washed away, which will not only give up all previous efforts, but also cause unpredictable consequences. It is suggested that the dam wall be blown up and repaired after the rainy season next year. Xu Qishi, the chief engineer in charge of the construction of Xin 'anjiang Hydropower Station, visited Changtan, had a field discussion with the person in charge of the construction site and engineers and technicians, and decided to shut it down immediately.
1February 2, 9601day, there was a sea of people on the dam, and tens of thousands of heroes rushed to the dam to intercept the water regardless of the water depth and slippery road. ..... After more than two hours of hard work, the river closure was successful and the dam was successfully closed. Since then, the turbulent Yongning River can no longer be willful and crazy. The fate of Yongning River has been firmly in the hands of the people, and it has become gentle and docile, and has begun to benefit Xiangzi.
⑥ Dam completion:1At the beginning of March, 960, the reservoir dam was completed. The dam type is clay inclined wall sand pebble dam shell dam. According to the elevation of the Yellow Sea, the dam crest elevation is 43m, the dam bottom elevation is 7.5m, the dam height is 35.5m, the breakwater height is 1.2m, the dam crest length is 506m, the dam bottom length is 333m, the dam bottom width is 293m and the top width is 6m. It is filled with clay gravel, but the foundation is covered with sand pebbles. The designed normal water level of the reservoir is 36 meters, with a corresponding storage capacity of 460 million cubic meters, a storage capacity of 35.5 square kilometers and a total storage capacity of 694 million cubic meters. The maximum working head of the power station is 30m, the minimum working head is 21.3m, the design head is 35.2m, and the rainwater collection area of the reservoir is 441.3km2..
⑦ Typhoon test:1In the typhoon season in August, 1960, continuous rainy days caused the water level of the reservoir to suddenly rise by five meters, only about two meters away from the top of the clay sloping wall. The rain is still underground, the water level is still rising and the safety of the dam is seriously threatened. Once the water overflows the dam crest, the dam will inevitably collapse, and the situation is extremely critical. All the migrant workers' groups were dispatched, and the cadres, workers and their families on the whole site threw themselves on the reservoir dam day and night, taking the lead in the dam protection and rescue work. The party and government leaders of the Hydropower Project Headquarters and Huangyan County, wearing Dai Li hats and sandals, share the same fate with the people guarding the dam. People are deeply moved by the exemplary actions of leading comrades, and their work enthusiasm is even higher. Many people forget to eat and sleep, and they can't get off the dam with minor injuries. The only thing on their minds is to save the dam. As long as there are people, there will be a dam. After a week of extremely fierce struggle, the rain stopped, the weather cleared up and the towering dam became more spectacular. Changtan Reservoir has withstood the test of the first flood peak and brought flood control benefits into play for the first time. The open channel spillway project started in the middle of 19591February. The overflow weir of open channel spillway is 1.2m in height, 36m in crest elevation and 60m in length. The transition section connected with 1 15m is connected with the steep groove, with a length of 2 10m and a width of 30m. A differential nose sill is set at the end of the steep groove, and the water flows into the groove with a width of 70m and a length of 265,440 after energy dissipation.
The spillway tunnel project was excavated in September 1960. Its entrance is in the form of a vertical shaft, divided into two holes, each of which is 5 meters high and 2.5 meters wide, with a center elevation of 25.5 meters and a bottom elevation of 23 meters. Each hole is equipped with a working gate and an emergency gate. The gate is a flat steel gate with fixed wheels, which is opened and closed by a 60-ton hoist. The hole is 277 meters long and 5.5 meters in inner diameter. All the spillway tunnels are lined with reinforced concrete, which was completed in late October of 196 1 year 10, and the flood discharge began on August 5, 1962. The water conveyance project of Changtan Reservoir started on 1958 1 month1day. The bottom of the tunnel is required to be as low as possible for construction diversion, drainage and emptying of reservoir water, but crossing the bottom will increase the gate pressure and increase the sediment in the reservoir into the tunnel, which will affect power generation. Although there are contradictions between the two, the dead storage capacity of Changtan Reservoir is particularly large. If the water in the reservoir is to be emptied, the height of the bottom of the cave must be kept to a minimum. According to the measured data, it is estimated that the sediment deposition in the reservoir area in recent 50 years is 2.5 million cubic meters, and its corresponding elevation is 13 meters. Therefore, it is determined that the elevation of the entrance hole bottom is 1 1 m (the elevation of the entrance center line is l 3 m), the hole body descends with the slope of 1: 100, and the elevation of the hole bottom at the surge shaft is 8.95 m. In order to prevent sediment from entering the tunnel, it is necessary to build a sand dam 24 meters before the tunnel entrance, and the top of the dam is as high as 13 meters. Such a big tunnel, not only has no one played it, but no one has even seen it. It is conceivable that the task is arduous and the technology is complex. At that time, there were few technicians, and there were only 15 masons in the whole site. If the diversion tunnel is not opened, the dam will not be closed and the whole project will be destroyed. In this case, the tunnel migrant workers' group actively took measures to give full play to the collective wisdom, and the old master volunteered to take the apprentice. In a few days, 120 migrant workers were trained as rock-breaking technicians, and the project progressed rapidly. It turns out that you can't get in one meter a day, and then a class can get in one meter or even two meters, which is rare in the progress of manually operated tunnels. After more than four months' efforts, the tunnel was finally opened at1March 959 10/2. The length of the tunnel is 2 13m, the inner diameter is 4.5m, the elevation of the entrance center is 13m, and the maximum flow is 53s cubic meters. It is lined with reinforced concrete, with an inclined entrance and a flat steel gate with fixed wheels, and its quality is also very good.
The tunnel entrance building is the throat of the water conveyance tunnel, through which water can be introduced into the tunnel, which is one of the key projects of the reservoir. It is divided into five parts: water inlet, console, control room, decontamination platform and trash rack. Its gate is always open, and it will be closed occasionally when the power station and water conveyance tunnel need maintenance.
Intake: On the one hand, the intake requires small energy loss, which can avoid cavitation caused by water flow separation, and its cross section changes as gently as possible, consistent with the direction of platform water flow. On the other hand, due to the limitation of trash rack and sluice, the convenience of construction needs to be considered. Therefore, the top surface of the bell-shaped rectangular water inlet with two holes for rice picking has an arc with a radius of 6.75 meters. The side becomes an inverse curve with a radius of 2.0 meters, and the bottom is flat. The water inlet is divided into two holes, each with a width of 3.5 meters and a height of 6 meters, and the reverse arc curve gradually changes into a sluice hole section with a width of 2.0 meters and a height of 4.0 meters.
Console; The height is 32.0m, the top elevation is 43.0m, and the bottom elevation is 1 1m, which is mainly used to support the hoist, operating gate and trash rack. For its own stability and safety, and to prevent the local sliding of rocks on the tunnel surface, the buttress retaining wall is adopted, which consists of three piers and a 40 cm thick inclined wall, and a cleaning platform is built at an elevation of 35 meters to clean the trash rack and repair the gate. The width of the pier in the cleaning platform is 1.5m, the side pier is below the elevation of 19m, and the width is changed from 1m to 1 m above 2.5m19m, and the side pier rises with a slope of 1: 0.5, all of which. The bridge span of the decontamination platform is 3.5 meters, which is connected with the fixed ends of the middle and side piers, so that the piers are connected into a whole.
Control room: the gate and trash rack hoist are installed in the control room, which is the entrance hub of the water conveyance tunnel, and the floor and beam are reinforced concrete structures. Control room length 13.2m, width 12m, total area 158.4m, brick wall, red tile roof, falling into the water on all sides.
Gate: There are two gates * * *, which are inclined steel gates with fixed wheels, with a height of 5. 1 15m, a width of 5.054m and a weight of 7.4 tons, which is 7 tons more. The gate is opened and closed by a 75t fixed hoist with double lifting points; The gate is driven by a cable pulley block with a diameter of 30cm, and its track adopts a slope of 1: 0.5. Below the bell mouth, the track is supported on the middle pier and the side pier, and above the bell mouth, it is supported on the special track beam. In order to reduce the friction when the gate is opened and closed, six rollers are installed on the bracket of each gate.
Trash rack: it is a mobile enclosed water rack with a height of 6.7m and a width of 3.90m.. The average flow through the trash rack is about 1.25 second cubic meters, and the head loss is about 0. 1.38 meters. The slope of piers along the track abutment adopts1; 0.5, with eight kilograms of rail directly installed on the pier. The trash rack frame is assembled with section steel, and the bars are made of steel plates, with a width of 75mm, a thickness of 12mm and a length of 3434 mm. The trash rack above the water intake adopts 140 reinforced concrete structure. The irrigation channel project started on 196 1 year 1 25th, and was basically completed in July, which began to bring benefits into play. The main canal runs from Changtan to Zeguo, with a total length of l 2 3 kilometers, of which the irrigation main canal with the maximum water transfer capacity of 53 m3/s is 20 kilometers long, 34. 1 m3/s is long 12.3 kilometers, and there are 7 main canals with a length of 87.5 kilometers (four of them are accessible, and the bottom width is 10 meters).
Starting from the tailrace of the power plant under the reservoir, it passes through the original old river, bypasses Fengjialing along the foothills on the right bank of the river, crosses Xiaoliqiao Creek, passes Maling to Sanguantang, bends straight to Yongning River, and blocks dams at both ends. The water flows through the dam canal (the water level is about 0.8 meters higher than the ground), and then excavates the stone along the left bank plain through the mountain boat. The total length of the main canal from Changtan to Shantouzhou is 14.7 km, the surface width of the earth canal is 20m, the bottom width is 4.5-5m, and the depth is 2.5-3.5m. The slope is11000, and the slope of the stone canal is11000. Buildings along the canal 108, including 3 inverted siphons; Chiang Kai-shek Inverted Siphon, Sanguantang Inverted Siphon, Peng 'an Inverted Siphon, * * * 20 meters long; Two 6-hole control gates (excluding the unactivated control gate of Sanguantang Tunnel): Yantou control gate and Shantouzhou control gate; Five 9-hole sluice gates: Yantou sluice gate, Beiyang sluice gate, Lin Jiaqiao sluice gate, Sanguantang sluice gate and Shantouzhou sluice gate: an aqueduct: Xiaoliqiao aqueduct; There are four highway bridges (that is, the Yellow Line Bridge across the main canal): Changtan Highway Bridge, Xiaoliqiao Highway Bridge, Shantouzhou Gate Highway Bridge and Maoshe Highway Bridge; Twenty-three temporary bridges (reinforced concrete bridge across main canal): Maoen Bridge, Qianjiang Bridge, Tande Bridge, Lan Yan Bridge, Yantou Bridge, Shawn Bridge, Lantian Bridge, Linggen Bridge, Professional Bridge, Beiyang Highway Bridge, Beiyang Temporary Bridge, Beiyang Hospital Bridge, Xiaoli Bridge and Mu Bai Foreign Temporary Bridge. Three RCC dams: Jiangjiaao RCC dam, Dongao RCC dam and New Li Ao RCC dam; Tunnel 1: Sanguantang Tunnel, l 90 meters long, 4 meters wide and 5 meters high, with a semicircular arch. In addition, there are 62 drainage ditches and culverts. The difficulty of the whole irrigation canal project can also be seen from the construction facilities of the road section less than 15 km.
Seven major canals spread all over Huangyan Plain, which played a great role in irrigation and transportation.
The first main canal starts near Jiaokeng, passes through Tongjiayang and Banyangcui, and ends at East Road, with a length of 8km, a bottom width of 13m, a slope of 1: 2 and a water depth of 3.6m.
The second main canal starts from Shilipu at the northern foot of Fangshan, passes through Xialang Mountain and ends at Zhaqiao, with a total length of 16 km, a channel bottom width of 13 m, a gradient of 1:2 and a water depth of 3.4 m..
The third main canal starts from Tongyu, passes through Luoyang to Jianyang Lake in the south, passes through Houyangjin, and ends near Du 'ao, with a total length of 4 kilometers, a canal bottom width of 12 meters and a slope of 3.2 meters.
The fourth main canal starts from Luqiao to Caijiayang, Dongshantou and south of Jiazhi Town to Haimen, with a length of12.5 km;
The fifth main canal starts from Luqiao and passes through Hong Qian, Sanjia and Jinqing Farm, with a total length of12.5km..
The sixth main canal starts from Luqiao, passes through Pengjie, Xinshi and Jinqing Gate, with a total length of 18.5km, a bottom width of 10m, a slope of 1:2 and a water depth of 2m.
The seventh main canal starts from Luqiao, passes through Jing Quan and Xinqiao and ends at Xinhe, with a total length of 14km.
In addition, in order not to affect the traffic from Wenling to Songmen Liangyunhe and Jinqinggang, an aqueduct was built from Panmashan via Ertang Street to Jinqingmen, crossing Jinqinggang and connecting with the sixth main canal, with a total length of 9 kilometers.
Jiangbei Channel:1Winter Solstice of 9651April of 966, Jiangbei Channel, one of the supporting projects of Changtan Reservoir, was completed. Jiangbei waterway is located in the north of Yongning, hence its name, and it is a main waterway running through the north of Yongning. It starts from the bedrock head of Huangyan Tide in the east and passes through Chaoji, Xitou, Toutuo, Yu Xia, Qian Xin, Gongdong and Wanglin, with a total length of 39.29 kilometers. The design flow of the channel entrance is 5 cubic meters per second. The whole canal has an inverted siphon with an inner diameter of 1.8m and a tunnel with an inner diameter of 2.6m. There are 43 sluices, including 2 1 sluices and 22 control sluices. Jiangbei Waterway Benefit Area is a long and narrow strip with rivers in the south and mountains in the north, with a general width of 0.5 ~ 1 km, and the narrowest place is the intersection of mountains and rivers. In the past, most farmland depended on farmland, cold water fields, rice fields and hemp fields. At present, 50,000 mu of farmland irrigation water has been basically solved, and the industrial and people's living water has been improved. The design flood control standard for the dam protection project of Changtan Reservoir is three-day rainfall 1.400 mm, with a total flood of 582 million cubic meters, a water level of 44.6 meters and a discharge of 2,845 seconds cubic meters. The design requires that the dam be raised by 3 meters. Due to the national economic adjustment, the dam protection project has not yet been implemented. The original designed flood control area of the reservoir is 280,000 mu. After the closure of the reservoir, the sedimentation of Yongning River in the lower reaches accelerated, and the discharge capacity decreased from the original 200 second cubic meters to the current 20 second cubic meters. At present, when the daily rainfall is 50 mm, the downstream Toutuo area1~ 30,000 mu of farmland is flooded, and the flood control area does not meet the design requirements.
After the completion of flood control and water storage in Changtan Reservoir, the regulation project of Yongning River failed to keep up, and the amount of discharged water was greatly reduced, which affected the ecological balance of Yongning River. A large amount of sediment carried by the tide silts up, the river channel narrows seriously, and the drainage is not smooth, which makes the waterlogging in the farmland downstream of Changtan Reservoir and on both sides of Yongning River more serious and affects the drainage of Xijiang River. The waterlogging area is more than 80 thousand mu, and the situation continues to deteriorate. Before the construction of the reservoir in Changtan, the tidal reach was 43 kilometers long, and the tidal boundary reached the shore village above Shantou Ship 16 kilometers. Shangzhu tidal current is 2700 seconds cubic meters, Haimen 300-ton boat can reach Huangyan directly, and 30-ton small steamboat can reach Chaoji. However, since 1962, nearly 50% of the Yongning River has been impounded (before the reservoir was built, the discharge from the long pool was 540 million cubic meters per year, while 1962- 1980 was only 60 million cubic meters per year). The maximum upstream flood flow is reduced from 2 100 m3/s to 74 m3/s, and the bed-making force is greatly reduced.
By 1978, 27 million cubic meters of sediment had been deposited in four 2-kilometer-long Yongning River channels, including 38 kilometers from Beiyang to Sanjiangkou, and the sedimentation was 22,365,438+10,000 cubic meters. The riverbed is generally raised1.7m, and the river section is reduced by 58% and the river width by 44.5% on average. Due to the elevation of the riverbed, the inland navigation in the middle and upper reaches of Yongning River has been unable to navigate, and the tonnage of the downstream shipping has also been significantly reduced. The problem of surplus migration is an important reason that affects the full play of the benefits of Changtan Reservoir.
Since the establishment of the reservoir, four groups of immigrants have moved out of 5974 households, but 2 158 households have not moved out as planned. Among them, there are 607 households below 38 meters above sea level, involving 25 villages in 7 townships. In these years, we will control water storage, which is less than normal 1.438+0 billion cubic meters.
Since the completion of 1962, Changtan Reservoir has fundamentally changed the water conservancy situation of Huangyan County, Wenling County, Jiaojiang City and Xicen Township of Linhai City, and played an important role in developing the national economy of Huangwen Plain and forming the Taizhou Golden Triangle. Because the dam protection project of the reservoir has not been completed, the supporting facilities are incomplete, the policies of forest land requisition, resettlement, water fee and irrigation area management have not been properly solved, and there are still contradictions in drought and flood, hydropower and upstream and downstream, which affect the project performance. In the future, it is necessary to determine the final scale of Changtan Reservoir, complete dam protection project, reservoir resettlement, irrigation area and flood discharge project, thoroughly rectify Yongning River, strengthen scientific management, further utilize water and soil resources, make comprehensive utilization, and give full play to the project benefits on the premise of ensuring reservoir safety.
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