Firefighters put the drainage pipe in place in Zhengzhou, capital of central China's Henan Province, July 21, 2021. Extremely heavy rainfall hit Henan on Tuesday, with precipitation in Zhengzhou, exceeding the highest level on local weather records. A rescue team of 1,800 firefighters has been deployed to the flood-hit region from seven neighboring provinces, together with boats, pumping vehicles, and flood rescue kits. (Xinhua/Hao Yuan)

In this aerial photo, firefighters pump rainwater out of a road in Zhengzhou, capital of central China's Henan Province, July 21, 2021. Extremely heavy rainfall hit Henan on Tuesday, with precipitation in Zhengzhou, exceeding the highest level on local weather records. A rescue team of 1,800 firefighters has been deployed to the flood-hit region from seven neighboring provinces, together with boats, pumping vehicles, and flood rescue kits. (Photo by Ma Xiaoran/Xinhua)

Firefighters check the drainage system in Zhengzhou, capital of central China's Henan Province, July 21, 2021. Extremely heavy rainfall hit Henan on Tuesday, with precipitation in Zhengzhou, exceeding the highest level on local weather records. A rescue team of 1,800 firefighters has been deployed to the flood-hit region from seven neighboring provinces, together with boats, pumping vehicles, and flood rescue kits. (Xinhua/Hao Yuan)

In this aerial photo, firefighters pump rainwater out of a road in Zhengzhou, capital of central China's Henan Province, July 21, 2021. Extremely heavy rainfall hit Henan on Tuesday, with precipitation in Zhengzhou, exceeding the highest level on local weather records. A rescue team of 1,800 firefighters has been deployed to the flood-hit region from seven neighboring provinces, together with boats, pumping vehicles, and flood rescue kits. (Photo by Ma Xiaoran/Xinhua)

A firefighter inspects a waterlogged road being drained in Zhengzhou, capital of central China's Henan Province, July 21, 2021. Extremely heavy rainfall hit Henan on Tuesday, with precipitation in Zhengzhou, exceeding the highest level on local weather records. A rescue team of 1,800 firefighters has been deployed to the flood-hit region from seven neighboring provinces, together with boats, pumping vehicles, and flood rescue kits. (Xinhua/Hao Yuan)

Firefighters pump rainwater out of a road in Zhengzhou, capital of central China's Henan Province, July 21, 2021. Extremely heavy rainfall hit Henan on Tuesday, with precipitation in Zhengzhou, exceeding the highest level on local weather records. A rescue team of 1,800 firefighters has been deployed to the flood-hit region from seven neighboring provinces, together with boats, pumping vehicles, and flood rescue kits. (Xinhua/Hao Yuan)