Guangxi Six‑Blue Reservoir Collapse Triggers Massive Flood Disaster

On July 6 2026 the Six‑Blue Reservoir (六蓝水库) in Guangxi, China, breached its dam after extreme rainfall associated with Typhoon Mishack. The storm produced more than 600 mm of rain in three days, affecting 14 cities and 63 counties and endangering roughly 375 000 residents. Down‑stream villages were inundated, while power, water and communications were disrupted.

Expert Wang Weilo noted that the disaster was not solely a weather event but resulted from multiple human‑made failures. The reservoir, built in 1958 with a capacity of 93.19 million m³, had undergone a costly reinforcement program, yet the allocated funds were heavily subcontracted, leaving only about ¥61.5 million of the ¥400 million budget for actual construction. The redesign reduced the spillway’s capacity from 2 240 m³/s to 1 469 m³/s – a 35 % drop – and critical design data were not publicly disclosed. Water level on the morning of the breach reached 111.20 m, exceeding the designed flood level of 110.29 m. Questions remain about whether the reservoir’s water was lowered to the required flood‑limit level before the storm.

Wang also stressed the need to distinguish between flood damage caused by the sudden dam breach downstream and the upstream flooding from rising reservoir levels. He called for a comprehensive review of engineering design, construction practices, flood‑control operation, early‑warning systems and emergency response to determine responsibility and prevent future failures.