Post-disaster reconstruction of the 7.5.8 dam-break incident in Henan Province

After the dam break of Banqiao Reservoir, the riverbed was exposed 1 1 year, and Zhumadian area suffered many floods. After repeated argumentation, in 1986, Xinbanqiao Reservoir was included in the national "Seventh Five-Year Plan" key project, with Huaihe Water Resources Commission as the construction unit; For the first time in China, the bidding method was adopted, and Gezhouba Engineering Bureau was selected as the construction unit. 1986 was rebuilt at the end of the year, and 1993 passed the national acceptance on June 5. The project is designed according to the once-in-a-century flood, and the possible maximum flood is checked, with a total storage capacity of 675 million cubic meters. The flood control storage capacity is 457 million cubic meters.

When the reconstruction of Banqiao Reservoir was completed, the Huaihe Committee of the Ministry of Water Resources and the Water Resources Department of Henan Province erected a monument with the inscription: "Banqiao Reservoir was built in 1952, which is one of the earliest large reservoirs built by the people of China. 1956 expanded and strengthened it, and 1975 was destroyed by a catastrophic flood on August 8. The flood volume in three days is 697 million cubic meters, the peak flow is 65.438+0.3 million cubic meters per second, both of which are about twice the original design value, and the instantaneous flow of dam break is as high as 7.865438+0.3 million cubic meters per second. It was ten years of turmoil, poor rescue, and took away tens of thousands of people's lives and property. It was a tragic disaster. The reconstruction began in 1987 1 month and took five years to complete. In order to eliminate water disasters and build water conservancy projects, we must be responsible to the people and ensure safety. The tree will never forget it. "

1September 1993, the reconstruction project of Shimantan Reservoir started,1February 1996 and1July 1998, the main works were completed. The total investment of the project is 256 million yuan, and the control basin area is 230 square kilometers. According to the design of once-in-a-century flood, check the once-in-a-thousand flood. Design water level 1 10.65m, corresponding to storage capacity103000 m3, check water level 1 12.05m, corresponding to storage capacity1200000 m3. The dam is a full-face roller compacted concrete gravity dam with a crest elevation of 1 12.50m, a dam length of 645m, a maximum dam height of 40.5m and a crest width of 7m. The maximum flow rate is 3927 cubic meters per second. It is a large reservoir with flood control as the main function, taking into account urban industrial water supply and tourism. The total compensation elevation of the reservoir area is108.53m, and the resettlement elevation is110.00m. ..