Group 1 - The Qiong Northwest Water Supply Project is a key national water network project under the "14th Five-Year Plan" and one of the 150 major water conservancy projects identified by the State Council, aimed at constructing a water resource allocation system in Qiong Northwest to address agricultural irrigation and urban-rural water supply issues, benefiting a population of 630,000 in Danzhou City and Baisha Li Autonomous County upon completion [2][2][2] - The construction of the Longling Tunnel, a critical node in the project with a total length of 3,532 meters, faced significant geological challenges, including water inflow and unstable rock formations, which were effectively managed through a layered excavation method to ensure stability and enhance safety and efficiency [2][2][2] - The project aims for the completion of the main works by 2025, maintaining high standards and strict requirements while promoting accelerated construction efforts to contribute to water security in Hainan Free Trade Port [2][2][2]

Core Points - The Qiong Northwest Water Supply Project has achieved overall connectivity, benefiting 630,000 residents in Danzhou and Baisha [2][3] - The project is a key national water network backbone project under the 14th Five-Year Plan and one of the 150 major water conservancy projects identified by the State Council [2] - The project aims to address agricultural irrigation and urban-rural water supply issues, ensuring water safety for both domestic and industrial use in the regions [2] Project Progress - As of now, the project has completed 91% of its overall progress, with a target to complete the main construction by 2025 [3] - The Longling Tunnel, a critical control node of the project, has successfully passed through complex geological conditions, marking a significant milestone [2][3] - The construction employs a layered step excavation method to enhance safety and efficiency, addressing various construction challenges [2]