Core Points - The Ministry of Water Resources has officially released the national standard for "Happiness River and Lake Evaluation Guidelines Part 1: Rivers with a Basin Area of 3000 km² or Less," which will be implemented on May 1, 2026. This is the first national standard for evaluating happiness in rivers and lakes in China [1] - The standard focuses on small and medium rivers, which account for over 90% of the total number of rivers in the country. These rivers are crucial for agricultural irrigation, urban water supply, and ecological conservation [1] - The evaluation standard includes a system of five primary indicators: safety, health, beauty, culture, and development, further detailed into 14 secondary indicators such as flood control rate and water usage control [1] - The Ministry of Water Resources plans to release additional guidelines for rivers and lakes with a basin area greater than 3000 km², aiming to establish a comprehensive evaluation system for rivers and lakes across the country [1]