Zhengzhou is proud to invest more than 8 billion USD to build a flood-resistant flams, but still engulfed in the catastrophic flood.

Rain in Zhengzhou as a slap in a sponge city project and showed that people could hardly win nature, a Chinese person written on the Weibo social network, referring to the flood thousand years with one

At least 33 people died and 8 people were missing since rain storms poured into Zhengzhou City and the surrounding areas in Ha Nam province last weekend.

As one of the most populous and poor provinces in China, Ha Nam has more than 99 million people and the economy depends mainly on agriculture and industry.

Four city is the concept of urban development focusing on using sustainable infrastructure such as green space and water absorbing land area, helping to deal with heavy rain, water reserves and reuse for items

In Henan, Zhengzhou's capital was invested 53.4 billion yuan (more than 8.2 billion USD) in a pilot project lasting from 2017 to 2030, to turn urban more than 12 million people into one

People bike on the flooded street in Zhengzhou, Ha Nam province on July 20.

According to the overall planning of Zhengzhou, the 2017-2030 period was announced in January 2018, which will be planned 191 flood drainage channels in the main urban area, building and renovating a sponge park

In the last 5 years, Zhengzhou has implemented a series of green landscape construction projects, water absorbing surface system with rainwater storage and reusing systems.

There is no situation to wade in the rainy days and without stagnant water on the road surface.

Zhengzhou urban construction Department announced since the construction of a sponge city until the end of May this year, 125 points prone to floods were removed, accounting for 77%.

However, the flood of the last weekend has paralyzed the transportation network and interrupted Trinh Chau's water supply, making arguments on social networks, when many people ask questions why the city is flooded

He Guangwei, a former reporter, also shared a post about building a sponge city in Henan and asking questions why 53.4 billion yuan was poured here?

Many others believe that the flood is a demonstration that China's ambition of Chinese sponges is not as effective as many people still think, even thinking this is just a waste of money.

However, many Weibo users argue that such criticism is unfair, because Zhengzhou last weekend suffers unusual rainfall in time too short.

According to local communications, Zhengzhou's sponge city project has the ability to cope with weather events that appear in the past 200 years or serious floods with a probability of being 0.5%

Flooding in Zhengzhou to the problem of building a sponge city is a misunderstanding about this city style, China Science Daily quotes Professor Hydrological Zuo Qiting of Zhengzhou University.

Flooded streets in Zhengzhou, Ha Nam province on July 21.

However, the question is why the sponge city fails in this flood?

Chen Qianhu, Director of Zhejiang Scarf City Research Center, said that flooding in Ha Nam was rare and could not be solved only by building a sponge city.

Chen added based on technical analysis, a sponge city that can solve rainwater problems from low to medium, while the heavy rain in Ha Nam exceeds the processing capacity of the system.

The rain in Zhengzhou is rare and the disaster has nothing to do with the construction of a sponge city, he said.

According to Trinh Chau Meteorological Bureau, from 20h on July 17 to 20:00 on July 20, the rainfall in three days in this city reached 617.1 mm, nearly equal to the average total rainfall of the whole year.

When faced with a large rainfall in such a short period of time, many experts believe that additional measures should be taken for the sponge city, such as building a deeper underground system to store water when heavy rain and pump