Hedi Reservoir Expansion Project

After the Hedi Reservoir was completed and put into operation, the dam height could not resist the once-in-a-century flood plus 10 wind and waves due to the small flood data of the original design foundation and the low flood control standard. During the period of 1960- 1965, the reservoir was hit by four typhoons of magnitude 9- 10, and the rocky slopes of the main and auxiliary dams were damaged to varying degrees, and the dam line was very long. There are hidden dangers in the 37 main and auxiliary dams along the east side of Li Zhan Railway, including piping, water leakage and termite holes, which seriously threaten the downstream 6544. After research by provincial and local hydropower departments, Zhanjiang Hydropower Bureau put forward the design task and preliminary design of Hedi Reservoir expansion project in 1973. It is planned to build a new main dam to replace 32 auxiliary dams, shorten the dam line by 6,730m, increase the catchment area by 53km2, and expand the storage capacity of Li Xing Reservoir1kloc-0/80,000m3. After the site design review organized by the Ministry of Water Resources and Electric Power, the preliminary design of Hedi Reservoir expansion project was approved in April 1975, with a national investment of 46.56 million yuan. The main contents include: Li Zhan railway line changed to19.5km; New main dam 46 1 m; The total storage capacity can be increased by 275 million cubic meters; Add the second power station at the head of the canal, with an installed capacity of 3200 kilowatts; The newly-built Longying West Wai, with a reclamation area of 32,000 mu, is used to resettle 654.38+220,000 immigrants.

The expansion project started in June 1975. By February, the Li Zhan Railway was rerouted 1982 and 17.4 km, and Longying West Wai, secondary power station, diversion tunnel, curtain grouting of main dam foundation and reinforcement of main and auxiliary dams were newly built. Later, the main dam could not be filled because the resettlement problem was not solved. 1983 construction was suspended due to the reduction of infrastructure investment by the state.

After the extension project was postponed, in order to ensure the downstream safety, the provincial flood control, drought relief and wind prevention headquarters decided to limit the storage of the reservoir, reducing the original normal storage level from 40.5 meters to 38.2 meters, and then adjusting it to 39.3 meters to control the operation, reducing the storage capacity of Li Xing by 65.438+28 billion cubic meters.

Because of the difficulties in resettlement, in the early 1990s, Zhanjiang Municipal Government proposed the reconstruction and expansion project as the reinforcement scheme for the original main and auxiliary dams.