Historical evolution of Qiufeng Reservoir
Historically, floods and droughts occurred frequently on both sides of the middle and lower reaches of the Liangying River, with heavy rainfall of more than 100 mm. Floods often burst the embankments and poured into the Lianjiang Plain; in the event of a drought, the upstream source dried up, and the salty tide in the Lianjiang River The surge caused drought and salty water damage; fighting for water in the past dynasties was not uncommon.
After the founding of the People's Republic of China, the masses urgently demanded the construction of a reservoir. The People's Government put it on the agenda and organized surveys many times. During the land reform in 1952, resettlement houses and cultivated land had been reserved; in June 1956, the county party congress passed a resolution to build the Qiufeng Reservoir, and established a "preparatory committee" with Guo Chun as director (first secretary of the county party committee and concurrently); 1957 The resettlement work of immigrants in the reservoir area was carried out in 2011; in July 1958, the project officially started. More than 10,000 migrant workers from Liangying, Simapu, Xiashan, Lugang, Heping, Chendian, Tongmen, etc. went to the construction site to carry out construction day and night in three shifts. At that time, a large number of projects in the county were launched at the same time, and there was an extreme shortage of manpower and materials. However, the people in the beneficiary areas showed great enthusiasm and obeyed the needs of reservoir construction. During the typhoon on September 12, 1959, the flood surged to a height of 38.38 meters. At that time, the elevation of the top of the earth dam was only 40.06 meters. Wind and waves splashed over the top of the dam. More than 4,000 cadres and people braved the wind and rain regardless of the damage to their homes. Rescue and protect dams to avoid a catastrophic dam collapse disaster. The earth dam was completed in October 1959, and more than 20,000 migrant workers were organized to support the canal project in the irrigation area. By the summer of 1960, more than 100 kilometers of main and branch canals were completed. In the more than 40 years since the completion of the reservoir, the reservoir has been reinforced, expanded and provided with supporting equipment many times. Mainly from 1964 to 1965, a hydropower station behind the dam was built to provide electricity for electric drainage and irrigation in waterlogged areas; the reservoir was expanded, and the earth dam was heightened by 2 meters and the surface was increased. It is 4 meters wide and the irrigation area has been comprehensively renovated and reinforced with canals and buildings, making the irrigation area 102,000 acres and the reservoir calibration standard reaching a 200-year return rate. From 1975 to 1976, floods from the 27-square-kilometer section of Shangjinxi, Libei and other reservoirs were diverted into the Qiufeng Reservoir and discharged to the South China Sea through the Yuanshan Flood Release Gate; the Hongchang Reservoir was built upstream to make the Qiufeng safety standard meet the once-in-a-millennium event. Over the past 40 years, a total of more than 3.4 million cubic meters of earthwork and 115,000 cubic meters of stone have been completed (excluding the Nanshan flood interception and Red Square projects), and more than 9.6 million man-days of labor have been invested to build this multi-purpose hub. Project, main benefits: Flash floods in the control area of 105.1 square kilometers are directly discharged into the South China Sea (accounting for one-third of the mountainous area of the Lianjiang River Basin in this county), relieving floods in Liangying River, greatly reducing waterlogging in the Lianjiang River, and irrigating a maximum of 100,000 acres. ; Recycle the tail water from the upstream Hongchang Level 3 hydropower generation, improve the power generation of the power station behind the dam, and become the main power generation of the county power grid. A total of 4 cascade power stations have generated 102.234 million kilowatt hours since they were put into operation. At this time, it also provided production water for the county's fish fry farm, eel farm, cloth factory, etc. By 1990, it had provided a total of 1.757 billion cubic meters of production and domestic water, and 1.468 billion cubic meters of water for power generation. In 1991, construction of the Qiufeng Waterworks began, benefiting 96 villages in 5 towns in Lianjiang Pian. After the completion of this project, as the largest water supply system in eastern Guangdong with a reservoir as its water source, the clear springs from Nanshan will be delivered to thousands of households in Lianjiang Plain through the water pipeline network, improving the drinking water source for more than 500,000 people. The economic and social environmental benefits of Qiufeng Reservoir have become more obvious since then.
Because the construction of the reservoir was limited by the historical conditions at that time, the design standards were low and the quality was poor. Although it has been reinforced, expanded and equipped for many times, the main buildings still have varying degrees of dangers. In 2000, it was determined to be a three-level reservoir. A dangerous dam.
In order to eliminate potential safety hazards in the reservoir and achieve safety standards, the project was approved by the province in 2002 and a planned investment of 52.66 million yuan was planned to be designed according to the 50-year flood standard and checked against the 100-year flood standard. Risk reinforcement.