三亚、保亭携手开展赤田水库流域综合治理，解决跨界治水难题

Core Insights - The collaboration between Sanya and Baoting in the comprehensive management of the Qitian Reservoir watershed has effectively addressed cross-border water management challenges, leading to improved water quality and sustainable development for both regions [1][4]. Group 1: Historical Context and Importance - The Qitian Reservoir, located in Sanya and Baoting, is crucial for supplying drinking water to 420,000 people, providing 55% of Sanya's drinking water [1]. - Historically, Sanya faced severe water shortages in the 1980s and early 1990s, prompting the construction of the Qitian Reservoir, which began in 1991 and was completed in 1994, with a total capacity of 77.1 million cubic meters [3][4]. Group 2: Governance and Management Mechanisms - The watershed management faced challenges due to administrative divisions, with Baoting controlling over 90% of the watershed area but facing restrictions on development, while Sanya relied heavily on the reservoir for its water supply [4][5]. - In 2021, an innovative ecological compensation mechanism was introduced, linking compensation funds to water quality and management actions, creating a financial pool of 600 million yuan to incentivize both upstream and downstream stakeholders [5][6]. Group 3: Environmental and Economic Outcomes - The water quality in the Qitian Reservoir has significantly improved, with the national control section's water quality rising to Class II by 2024, total phosphorus concentration decreasing by 17.4%, and the proportion of high-quality sections reaching 85.7% [7][8]. - The implementation of ecological agriculture and technological support has led to increased economic benefits for local farmers, with the production of ecological products in Baoting rising to 25,800 kg per hectare, and significant income increases reported by local residents [7][8].