数量面积占比均居全国前列！山东共有大中型灌区401处，设计灌溉面积5118万亩

Core Viewpoint - The Ministry of Water Resources has recognized 401 large and medium-sized irrigation areas in Shandong Province, covering a designed irrigation area of 5.118 million acres, which positions the province among the top in the country in terms of both quantity and area [1] Group 1: Irrigation Area Details - Shandong Province has 401 large and medium-sized irrigation areas, with 42 classified as large irrigation areas covering 3.085 million acres [1] - There are 125 key medium-sized irrigation areas over 50,000 acres, with a designed irrigation area of 1.555 million acres, and 234 general medium-sized irrigation areas covering 478,000 acres [1] Group 2: Management and Development Initiatives - The irrigation area directory is a foundational work for irrigation area construction and management, with Shandong Province taking significant steps since the Ministry's directive in 2021 [1] - A dedicated task force was established to conduct a comprehensive survey and verification of the actual management and operational status of the irrigation areas [1] - Future initiatives will focus on enhancing the functionality of irrigation areas, emphasizing water demand, and improving modern irrigation management through standardization and information technology [1]