Group 1 - The current outflow from the Miyun Reservoir has decreased, but the water flow in the Chaohua, Baihe, and Chaobai rivers remains turbulent, prompting increased inspections and risk management by staff [1] - Starting from August 1, the Guanting Reservoir has increased its outflow to 100 cubic meters per second, while the flow in the Yongding River continues to rise [1] - Despite a reduction in outflow, the five reservoirs in Pinggu District are still discharging water due to the impact of previous heavy rainfall and upstream inflow, leading to increased soil saturation and potential stability issues in embankments [1] Group 2 - A new round of rainfall is expected, raising the risk of mountain floods in nine districts of Beijing, with a yellow warning for mountain flood disasters issued by the Beijing Water Authority and Meteorological Bureau [1] - The risk of mountain floods is particularly high in the Miyun District, with orange risk warnings issued for the Yanqing, Pinggu, Huairou, Mentougou, Fangshan, Changping, Fengtai, and Shijingshan districts [1] - Citizens are advised to avoid outdoor activities in mountainous and water areas due to high soil saturation levels [2] Group 3 - The water authority has issued safety reminders for citizens to stay away from riverbanks and avoid activities such as washing, fishing, swimming, and boating in river areas during the outflow period [2] - Parents are urged to supervise children closely to prevent accidents near riverbanks [2] - It is prohibited to dump waste or obstruct river channels to ensure they remain clear and safe [2]

Core Points - The Miyun Reservoir has initiated a controlled discharge to lower its water level below the flood limit [1] - All 14 rubber dams on the Baihe and Chaohe rivers are currently operating in a collapsed state [1] - The Beijing Water Authority has mobilized machinery and personnel for emergency response and monitoring [1] - All 352 mountain flood channels in Beijing have been completely closed [1]