Core Viewpoint - The completion of the Yunwuzhai tunnel marks a significant milestone in the construction of the Tizikou irrigation district phase one project, which is crucial for supporting the economic and social development of drought-affected areas in northeastern Sichuan and revolutionary old districts [1] Group 1: Project Details - The Yunwuzhai tunnel has a total length of 2,928 meters and a designed water flow capacity of 6.65 cubic meters per second [1] - The Tizikou irrigation district phase one project consists of 17 channels, with a total length of 375.59 kilometers [1] - Upon completion, the project is expected to provide an average annual water supply of 396 million cubic meters [1] Group 2: Construction Challenges - The tunnel's geological conditions are complex, characterized by fractured rock, poor stability, abundant groundwater, and high gas risks, making construction difficult and safety risks high [1] - The project team has implemented strict safety measures, including the "one blast three checks" system and "three-person chain blasting system," along with advanced geological forecasting to ensure safety during construction [1] Group 3: Future Outlook - The completion of the tunnel is seen as a critical step in advancing the overall project construction, which is part of the "project attack year" initiative [1] - The project is a key component of Sichuan's "six horizontal and six vertical" backbone water network, aimed at enhancing water supply and supporting regional development [1]

Core Points - The article discusses the progress of the Yinhang-Jiwei project, a significant water conservancy project in China, which has successfully completed the main tunnel construction, moving closer to its goal of water delivery by 2026 [1][5]. Group 1: Project Overview - The Yinhang-Jiwei project consists of two main components: water diversion and distribution, with a total length of 983 kilometers for the Qinling water supply tunnel [5]. - The project aims to deliver 1.5 billion cubic meters of water annually to meet the needs of over 14 million people in 21 urban areas within Shaanxi province [7]. Group 2: Engineering Challenges - The construction faced significant challenges, including high temperatures (40°C) and humidity (90%) within the tunnels, as well as frequent rock bursts, with over 4,000 incidents recorded during the project [18]. - The project has implemented measures for environmental protection, including the establishment of fish breeding stations and ecological facilities to support local biodiversity [16]. Group 3: Impact and Benefits - The project has already demonstrated its importance by providing 120 million cubic meters of water during drought conditions in the spring and summer of 2023, ensuring water security for Xi'an [14]. - The first hydropower generator of the Huangjinxia Hydropower Station has been successfully connected to the grid, with an average annual power generation of 132.5 million kilowatt-hours [9].

Core Insights - The article highlights the transformation of a country with complex water conditions and significant river management challenges into a leader in water infrastructure, boasting the largest and most comprehensive water management system globally [2] Group 1 - The country has achieved world-class water engineering projects and technological innovations, addressing difficult challenges in water management [2] - It has developed the largest water infrastructure system in the world, benefiting the most people [2] - The advancements in water management are crucial for sustaining ecosystems and supporting economic growth [2]

Core Viewpoint - The Dianzhong Water Diversion Project has made significant progress with the successful construction of the Qujiang inverted siphon, marking a breakthrough in this major national water conservancy project [1][2]. Group 1: Project Overview - The Qujiang inverted siphon is located in the Water Tank Village of Gaoda Township, Tonghai County, Yuxi City, and spans approximately 1829 meters, intersecting multiple transportation routes and rivers [2]. - The project is part of the largest water diversion project under construction in China, covering a total length of 664.326 kilometers, including 611 kilometers of water diversion tunnels [3][5]. Group 2: Technical Challenges and Innovations - The construction team faced challenges such as high precision requirements for road subsidence control, complex underground pipelines, and strict ecological protection standards [2]. - Innovative techniques such as refined detection, three-dimensional pipeline positioning, and ecological isolation were employed to control roadbed subsidence within 3 millimeters while ensuring the safety of the ecological environment and pipelines [2]. Group 3: Expected Impact - Upon completion, the project is expected to achieve an annual water diversion volume of 340 million cubic meters, effectively alleviating water scarcity issues in the central Yunnan region and benefiting over 11 million people along the route [5].

Core Viewpoint - The completion of the dam for the Meipatang Reservoir project in Tibet marks a significant milestone in the construction of one of the largest medium-sized water conservancy projects in the region, with a total investment of 1.435 billion yuan [1] Group 1: Project Overview - The Meipatang Reservoir is located in the Zaqi River midstream in Baqing County, Naqu City, Tibet, with an average elevation of 4,100 meters [1] - The total storage capacity of the reservoir is 24.1 million cubic meters, with a dam length of 539 meters and a maximum height of 55 meters [1] - It is the largest single investment water conservancy project in Naqu City and the largest ongoing investment project in Tibet [1] Group 2: Construction Challenges - The construction faces multiple challenges due to high altitude, low air pressure, and significant temperature variations [1] - To ensure quality and durability, the dam employs a mixed design of roller-compacted concrete gravity dam and geotextile membrane gravel dam, enhancing its impermeability, frost resistance, and corrosion resistance [1] - The project team has conducted relevant process experiments to analyze parameters such as layer thickness and compaction frequency to ensure construction quality [1] Group 3: Project Impact - The Meipatang Reservoir is expected to be completed by June 2026 and will meet the irrigation needs of 44,400 acres of grassland along the downstream riverbanks [1] - It will address the urban and rural water supply needs of approximately 53,100 people in Baqing County and Suoxian [1] - The project plays a crucial role in promoting high-quality economic and social development, advancing rural revitalization, and improving the ecological environment in the region [1]

Core Points - The article discusses the historical significance of the Yongding River in the development of Beijing, highlighting its dual role as a source of sustenance and a potential threat due to flooding [2][5][6] - It emphasizes the ongoing interaction between the city and the river, illustrating how various water management projects have been implemented over centuries to mitigate flooding while utilizing the river for irrigation and transportation [11][25] Historical Context - The Yongding River has been a crucial water source for Beijing since ancient times, with its water system forming the basis for the city's growth [4][5] - Major water management projects began as early as the Cao Wei period, with the construction of the Liling Weir and Chexiang Canal aimed at irrigation [7][8] - Despite these efforts, the river's tendency to flood has led to repeated destruction and reconstruction of water management structures throughout history [9][10][11] Urban Development - The river's natural features influenced the location and expansion of Beijing, with its floodplain providing fertile land for agriculture [5][6] - The city’s growth was initially hindered by the river's flooding, prompting the search for alternative locations for settlement [6][12] - The transformation of the Yongding River into a navigable waterway was attempted during the Jin Dynasty, but ultimately failed due to the river's unpredictable flow [12][15][16] Water Management Efforts - The article details various historical attempts to manage the river, including the construction of the Jin Kou River during the Yuan Dynasty, which aimed to improve transportation and irrigation [19][21] - The management of the Yongding River evolved over time, with the Qing Dynasty formalizing a system to address flooding issues [25] - Modern efforts continue to focus on balancing urban growth with effective water management, reflecting a long-standing relationship between the city and the river [25][26]

Core Insights - The completion of the Duoduo Stone Tunnel marks a significant milestone in the construction of the Zhaodu Reservoir project in Chongqing, which is part of China's major water conservancy initiatives [1][2] - The Zhaodu Reservoir, with a total storage capacity of 201 million cubic meters, aims to enhance flood control, irrigation capacity, and ecological protection in the region [2] Project Overview - The Zhaodu Reservoir project is classified as a Class II large-scale water conservancy project and is one of the 172 key water-saving supply projects in the country [1] - The project is being implemented by a consortium consisting of China Communications Construction Company (CCCC) and Yangtze Design Group [1] - The reservoir's dam has a normal water level of 375 meters and includes a water conveyance system approximately 94 kilometers long, covering multiple districts in Chongqing [1] Construction Details - The Duoduo Stone Tunnel, which is 4,098 meters long, has successfully connected upstream and downstream water systems, playing a crucial role in the water conveyance project [1] - The construction faced challenges such as complex geological conditions and ventilation difficulties, which were addressed through advanced geological forecasting and specialized design for ventilation and drainage [1][2] - The project team implemented a "short advance, weak blasting, and frequent support" strategy to ensure safety and efficiency, completing the tunnel in 475 days, six months ahead of schedule [2] Regional Impact - Upon completion, the Zhaodu Reservoir will serve as a flood control barrier for the Qijiang urban area and surrounding towns, significantly improving regional water supply and irrigation capabilities [2] - The project is expected to contribute to the ecological protection and power generation, enhancing the overall water network layout in Chongqing and supporting the Chengdu-Chongqing economic circle [2]

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].

Core Insights - The Chongqing Zhaodu Reservoir project has successfully completed the first tunnel, marking a significant milestone in the construction of this major water conservancy project [1] - The reservoir is part of China's national water-saving and supply initiatives, classified as a Class II large-scale water conservancy project, with a total storage capacity of 201 million cubic meters [1] - The project aims to enhance flood control, irrigation capacity, and ecological protection in the region, contributing to the development of the Chengdu-Chongqing economic circle [1] Project Details - The Zhaodu Reservoir project consists of a hub project and a water conveyance system, with the dam's normal water level set at 375 meters [1] - The water conveyance system includes a main canal, left canal, and right canal, totaling approximately 94 kilometers in length, impacting multiple districts in Chongqing [1] - The completed tunnel, known as the Duoduo Stone Tunnel, is 4,098 meters long and serves as a critical route connecting upstream and downstream water systems [1] Strategic Importance - Upon completion, the Zhaodu Reservoir will serve as a flood control barrier for the Qijiang urban area and surrounding towns, significantly improving regional water supply and irrigation capabilities [1] - The project is expected to play a vital role in enhancing the water network layout in Chongqing and supporting the strategic development of the Chengdu-Chongqing economic circle [1]

Core Viewpoint - The Dashi Gorge Water Conservancy Project in Xinjiang has officially entered the water storage phase, marking a significant milestone in its construction and operational readiness [1][3]. Group 1: Project Overview - The Dashi Gorge Water Conservancy Project is located in the Aksu region of Xinjiang and features the world's highest concrete-faced rockfill dam, with a maximum height of 247 meters, equivalent to over 80 stories [3]. - The dam's construction involved a total fill volume of 1,890,000 cubic meters, which could fill over 7,000 standard swimming pools [3]. - The project plans to install three 250,000-kilowatt turbine generator sets, with a total installed capacity of 750,000 kilowatts [3]. Group 2: Economic and Environmental Impact - Once completed, the project is expected to generate over 1.8 billion kilowatt-hours of clean electricity annually, sufficient to meet the annual electricity needs of 65,000 households [5]. - The project will provide a stable water source for agricultural irrigation in the Aksu region, which is crucial for the production of crops such as paper-shelled walnuts, apples, and jujubes [5]. - The project will also contribute 3.42 billion cubic meters of ecological water to the Tarim River annually, improving the ecological environment of the river basin and alleviating water shortages in over 8 million acres of downstream irrigation areas [5]. Group 3: Project Timeline - The Dashi Gorge Water Conservancy Project commenced construction in November 2019, with the dam expected to be completed by December 2024 and full operation planned for 2026 [5].