Group 1 - The Yellow River Water Resources Commission has initiated water and sediment regulation for the flood season of 2025 due to recent rainfall affecting the middle reaches of the Yellow River [1] - The operation aims to balance flood defense and sediment discharge, adhering to principles of safety and comprehensive consideration [1] - The water regulation will last approximately one week, with the Xiaolangdi Reservoir's maximum discharge flow controlled at around 2800 cubic meters per second [1] Group 2 - The Sanmenxia Reservoir began controlled discharge at 3000 cubic meters per second from September 7, 15:00, until it transitions to free discharge [1] - The Xiaolangdi and Xixiaoyuan reservoirs are jointly regulated, with controlled discharge starting at 1500 cubic meters per second from September 7, 15:00, and increasing to 2500 cubic meters per second from September 8, 9:00 [1] - Future adjustments to discharge flows will be made in real-time based on reservoir inflow and sediment discharge conditions, with a shift to flood control measures if significant flooding occurs in the middle reaches of the Yellow River [1]