Core Points - The Chongqing Zhaodu Reservoir project has successfully completed the first water conveyance tunnel, marking a significant milestone in the construction of this major water conservancy project [1][3]. Group 1: Project Overview - The Chongqing Zhaodu Reservoir is one of the 172 key water-saving supply projects and one of the 150 major water conservancy projects approved by the State Council, classified as a Class II large-scale water conservancy project [3]. - The project consists of a hub project and a water conveyance project, with the dam having a normal storage level of 375 meters and a total reservoir capacity of 201 million cubic meters [3]. - The water conveyance system includes a main channel, left channel, and right channel, with a total length of approximately 94 kilometers, impacting multiple districts in Chongqing [3]. Group 2: Tunnel Details - The completed tunnel, known as the Duoduo Stone Tunnel, is located near the Sanjiang Street in the Qijiang District, with a total length of 4,098 meters and a cross-section shaped like a city gate [3]. - The tunnel has a bottom width of 2.8 meters and a net height of 3.56 meters, serving as a crucial route connecting the upstream Wengjiagou siphon and the downstream Dahuigou box culvert [3]. Group 3: Strategic Importance - Upon completion, the Zhaodu Reservoir will act as a flood control barrier for the Qijiang urban area and surrounding towns, significantly enhancing regional water supply and irrigation capabilities [3]. - The project also aims to provide ecological protection and power generation benefits, playing a vital role in improving the water network layout in Chongqing and supporting the development of the Chengdu-Chongqing economic circle [3].