On the morning of December 13, 2021, the reconstruction project of the Longtang Dam on the Nandu River in Haikou City officially started construction.

According to reports, the Longtang Dam was built in 1969 and put into use in 1971. It is a comprehensive water conservancy project integrating urban water supply, agricultural irrigation, flood control, drainage, and power generation. The Longtang Dam undertakes about 70% of the water supply in the main urban area of Haikou, as well as the ecological water supply tasks for farmland and inland rivers on both sides of the bank. During the construction period of the renovation project, it is necessary to ensure the water supply in the main urban area of Haikou, but also to complete the construction tasks on time and with high quality, which greatly increases the difficulty of construction.

According to Zhang Shengbao, the site leader of the Longtang Dam Hub Reconstruction Project Department of the Fourth Bureau of Hydropower, Hainan Province, the construction unit, in order to ensure the normal water supply of the Longtang Water Source Plant during the construction period, the dam hub will be rebuilt 70 meters downstream of the original dam axis, and phases will be adopted. Construction is carried out in the form of diversion and closure. In the typhoon season, the maximum flow of Longtang Dam can reach more than 10,000 cubic meters per second. Diversion and closure in stages is the key and difficult point of the entire project.

The Nandu River Longtang Dam Hub Reconstruction Project is located on the Nandu River in the Longtang Township of Qiongshan District. The proposed hub is mainly composed of river sluices, diversion sluices, power stations, fish passages, and irrigation diversion canals. Among them, the proposed pivotal sluice is located 70 meters downstream of the original pivotal dam site (Longtang Dam). It is mainly for water supply, taking into account irrigation, ecological water replenishment, power generation, tourism, etc., and creates conditions for improving upstream flood control and drainage.

"During construction, we will carry forward the spirit of arduous struggle and face difficulties in accordance with high standards and strict requirements, meticulous organization, scientific construction, strict construction links, and high-quality completion of the construction tasks of the Longtang Dam junction reconstruction project, and promote The project will be completed as soon as possible and bring benefits into play.” Pang Baoping, party secretary of the Northern Company of China Hydropower Fourth Bureau, said that the project will be constructed in accordance with the standards and quality of the “Dayu Award” and “Luban Award” projects, and strive to become a landmark water conservancy building and landmark in Haikou. Tourism node, serving the construction of Hainan Free Trade Port.

This project is one of the key water source projects identified in the "Thirteenth Five-Year Plan for Water Affairs Development of Hainan Province" and "Overall Plan for the Construction and Comprehensive Management of Water Ecological Civilization in the Nandu River Basin". Project library project. It is expected to be completed and put into use in February 2025. After the Longtang Dam junction reconstruction project is completed, it will significantly improve the water supply security capacity of Haikou City and Jiangdong New District, and reduce the pressure of flood control and drainage in the upstream area of Longtang Dam. After the contradiction between water source protection and navigation is resolved, shipping can be taken into account. Editor/He Yuting