Heavy rain has been continuously falling in areas including Yanqing, Huairou, and Miyun in Beijing on July 26 and 27. The torrential rain in Miyun triggered floods and landslides, causing severe damage to multiple villages with disruptions in transportation, electricity, and communication. Due to the rapid increase in upstream water flow, the Miyun Reservoir saw its highest historical peak inflow and had to release floodwater downstream urgently at 3 pm on the 27th.
According to the Xinjing News, a tourist named Ms. Pan recalled that in the early hours of the 27th, water suddenly rose to chest level, trapping her group of seven in a farmhouse. They had to escape through a window and seek refuge in a nearby high-altitude guesthouse. They were eventually rescued by a bulldozer with no injuries. Upon returning to the hotel later, they found the interior filled with mud.
From 12 pm on the 26th to 2 am on the 27th, Miyun District in Beijing experienced heavy rainfall, with an average precipitation of 73.5 mm across the entire district. The highest accumulated rainfall was recorded at the Huangtuliang Station, reaching 315.3 mm. The localized and intense downpour resulted in road closures, power outages, and communication disruptions in several villages.
The heavy rain caused the closure of 12 roads in Miyun District, with 163 base station signals also affected.
Due to the impact of the downpour, the upstream water inflow into the Miyun Reservoir significantly increased, reaching a peak inflow rate of 6,550 cubic meters per second, exceeding the historical record. The reservoir initiated flood discharge at 3 pm on the 27th, gradually lowering the water level below the flood limit.
The flood discharge will lead to a significant rise in water levels in downstream rivers such as Chaohui River, Baihe River, and Chaobai River.
As of 5 am on the 27th, a total of 3,065 people from 1,452 households in 149 villages across 18 towns have been evacuated in Miyun District.
As of 5:30 pm on July 27th, red rainstorm warnings have been issued in four districts of Beijing, with orange alerts in six districts. The entire city is under a yellow rainstorm warning.
At 5:30 pm on July 27th, Pinggu District upgraded to a red rainstorm warning, while Huairou, Yanqing, and Miyun districts are under red warnings.
Fangshan, Chaoyang, Changping, Tongzhou, Daxing, and Shunyi districts have upgraded to orange rainstorm warnings.
Dongcheng and Xicheng districts are under blue rainstorm warnings, while Fengtai, Shijingshan, Mentougou, and Haidian districts remain on yellow alert.
From 6 am to 4 pm on July 27th, the average rainfall in Beijing was 8.7 mm, with the highest rainfall of 61 mm in Chaoyang Picun Village and 63.2 mm in Miyun Baguzhuang. The most intense rainfall occurred in Wanjiazhuang, Pinggu, with a rate of 54.3 mm per hour (from 12 pm to 1 pm on the 27th).
From 8 am on the 26th to 8 am on the 27th, due to rainfall, 16 rivers in Beijing, Hebei, Inner Mongolia, Shanxi, Gansu, Fujian, Yunnan, and other regions experienced flooding exceeding warning levels, with the highest exceeding warning levels by 3.48 meters. Among them, six rivers including the Chaobai River tributary, the Xiaola River, and the main and tributary rivers of the Luan River in Chengde, Hebei, the Baihe River tributary of the Chaobai River in Miyun, Beijing, the Xiaolingteng River tributary of the Luan River in Xi’an Guole, Inner Mongolia, and the Nanyang River tributary of the Yongding River in Datong, Shanxi, saw the worst floods recorded in history.
It is expected that Beijing will continue to experience significant rainfall on the 28th and 29th, with a rainy weather pattern persisting into the following week.