Zhengzhou Rainfall

"Climate change and La Niña increase the likelihood of the '7·20' Zhengzhou extraordinary typhoon-rainstorm" (2023).

• Zhengzhou is implementing the "Sponge City Initiative" project to improve rainwater absorption and reduce flooding by making permeable pavement, better water storage systems, and green rooftops.
• Over 500 new flood mitigation projects are planned/underway in central China

+ 12% likelihood of extreme rainfall

• Urban flooding caused suberged subways, road destruction, displacment of residents
• Over 300 deaths and 50 billion yuan($7.7 billion USD) in economic losses were recorded
• The main cause of all of this is rising global temperatures that have increased atmospheric moisture

"Managing Extreme Rainfall and Flooding Events: A Case Study of the 20 July 2021 Zhengzhou Flood in China" by Xiaofan Zhao et al. (2023).

Zhengzhou, China

Global Effects

• Disrupts global supply chains
• Puts pressure on global insurance and disaster funds
• Increased food prices from messing up agriculture
• Similar events happened in western Europe(Germany and Belgium) in July 2021, where extreme floods from intense rain caused over 200 deaths

Zhengzhou's flood season(Jul-Sep) accounts for 60-70% of Zhengzhou's total annual precipitation

Flood Season

Environmental Impact

Fighting the Problem

Area: 2,898 mi²Population: 12.6 million (2020) Annual mean temperature of 15.4 °C (59.7 °F)

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• It’s got the Wow effect. Very Wow.
• Make sure your audience remembers the message.
• Activate and surprise your audience.