转自：四川在线 四川在线记者 尹梦奇 2025年12月30日，南充阆中市石滩镇构溪河渡槽建设现场，渡槽上部结构模板安装、混凝土浇筑等工序正有条不紊地推进。构溪河渡槽位于四川亭子口灌区 一期工程第I标段，全长708米，目前正进行第八跨42米槽身、双联拱拱上排架等多作业面施工。 冬季是兴修水利的黄金期。在四川，亭子口灌区一期、石滩水库灌区等一批重大水利工程、中型灌区改造项目进入建设高峰期，建成后将进一步提升全省供 水保障能力。 破难点 重大项目攻坚提速、骨干水网加速完善 四川构溪河畔，一座单跨108米的双联拱凌空飞架，这是构溪河渡槽的一部分。 1个多月前，构溪河渡槽双联拱拱箱完成施工。"这是整个项目难度最大的关键工序。"四川水发建设有限公司亭子口项目三分部项目副经理王逸介绍，构溪 河渡槽是四川水利行业首次应用大跨度大流量悬拼钢拱架支撑体系的工程，行业内参照先例很少。 为何采用如此特别的设计？"因为渡槽地处构溪河湿地自然保护区，为最大限度减少对当地生态环境的影响，施工严禁涉水作业。"王逸介绍，目前，项目团 队正全力推进构溪河渡槽双联拱拱上排架施工，已完成进度约50%。与此同时，双联拱6米槽身的施工也已启动，预计1月 ...

Core Viewpoint - The modernization project of the Shishihang irrigation area in Anhui Province has received approval from the provincial development and reform commission, marking a new phase in its modernization efforts [1] Group 1: Project Overview - The Shishihang irrigation area is the largest irrigation area built after the founding of New China and has been included in national irrigation development plans and key water conservancy projects [1] - The project involves three cities (Lu'an, Hefei, and Huainan) and 15 counties, with major construction activities including the renovation of 508 main and branch canals, totaling 3,828.11 km, and the construction of 37 new or expanded water supply pump stations [1] Group 2: Investment and Impact - The estimated total investment for the project is 19.26 billion yuan, with a construction period of 48 months [1] - Upon completion, the irrigation guarantee rate will exceed 80%, the integrity rate of key projects will reach over 95%, and the irrigation water utilization coefficient will improve to above 0.58 [1] - The project aims to enhance irrigation coverage by 7.2 million acres, increase annual water-saving capacity by 243 million cubic meters, and boost annual grain production capacity by 576 million jin [1] Group 3: Water Resource Management - The project will further improve the layout of the irrigation area and establish a "four-water mutual assistance" water resource allocation system, enhancing the optimization of water resource allocation and supply security in the Jianghuai watershed region of Anhui Province [1]

Core Insights - The Ministry of Water Resources reported that the national irrigated farmland area has reached 108.6 million acres, with summer grain production accounting for 88.85% of the total summer grain output by 2025 [1] Group 1: Irrigation and Agricultural Production - Water resources are crucial for agriculture, with the current irrigated farmland area representing approximately 56% of the total cultivated land, producing over 80% of the country's grain [1] - The average yield per acre in large and medium-sized irrigation areas is 1.5 to 2 times higher than the national average, and 2.5 to 3 times higher than rain-fed farmland [1] Group 2: Infrastructure Development - The Ministry of Water Resources has supported the construction of 15 new large irrigation areas, with a designed irrigation area of 11.3 million acres, and 145 modernization projects for large and medium-sized irrigation areas, which will restore and improve nearly 20 million acres of irrigation area [1] - The implementation of 70 key regional drainage projects is underway, along with the advancement of digital and information management in large and medium-sized irrigation areas [1] Group 3: Water Conservation Efforts - Agriculture is a major water consumer but also has significant water-saving potential, with the area of water-saving irrigation projects reaching 63.8 million acres, a 12.5% increase compared to the end of the 13th Five-Year Plan [2] - The average water usage per acre for irrigated farmland has decreased to 342 cubic meters, a 4% reduction from the end of the 13th Five-Year Plan [2]