搜救失联人员、转移安置群众、启动灾后重建……甘肃榆中，多方力量全力抢险救援

Group 1 - The core issue is the severe mountain flood disaster in Yuzhong County, Gansu Province, caused by continuous heavy rainfall since August 7, leading to significant infrastructure damage and ongoing rescue efforts [2][15][18] - The flood has damaged 51 roads totaling 102.2 kilometers, with five bridges destroyed and 14 administrative villages cut off [15][17] - Rescue operations are ongoing, with multiple agencies involved in searching for missing persons and relocating affected residents [2][31][39] Group 2 - The Ministry of Water Resources has organized a professional water quality testing team to monitor water safety in affected areas, focusing on 35 key indicators [1] - As of now, all damaged roads in Yuzhong County have been restored, facilitating the transport of rescue materials and personnel [11][17] - The S104 provincial road, crucial for accessing severely affected areas, has been reopened, significantly improving rescue efficiency [13][17] Group 3 - The local power supply has been affected, but the main power lines have been restored, and efforts are now focused on rebuilding the damaged electrical infrastructure [4] - Communication services have largely returned to normal in heavily impacted villages [4] - Continuous rainfall is expected in the coming days, prompting the Ministry of Water Resources to maintain a level four emergency response for flood defense across 13 provinces [6]