上游蓄滞洪区投用，昌平升级流域“总开关”

Group 1 - The rainfall in Beijing this year is significantly higher than in previous years, prompting the completion of structural upgrades at the Shihe Weir and the establishment of flood retention areas in Changping [1][4] - Changping has implemented a comprehensive network for flood management, including over 1,000 kilometers of rainwater pipelines and the clearing of 48,000 rainwater outlets [1][2] - The flood prevention material warehouses in Changping have been thoroughly checked and stocked with over 40 types of flood control supplies, ensuring readiness for the flood season [2][3] Group 2 - The Shihe Weir plays a crucial role in flood control, regulating water flow from Changping to downstream areas, and is a key point for issuing flood warnings [3][4] - Changping has initiated the planning and enhancement of upstream river channels, with three flood retention areas constructed to hold approximately 16 million cubic meters of water [4] - The Shihe Weir has successfully completed its structural upgrades, addressing safety concerns such as concrete carbonization and corrosion, which enhances its flood management capabilities [4]