Traditional cities absorb only 20-30% rainwater. The rest is wasted through drains and sewers which during floods are associated with death and disaster. Sponge cities are designed with permeable pavements and roads, green walls, roofs and green buildings to passively absorb, clean and re-use rainwater. These measures prevent both drought and floods. Within 1-2 years new ecosystems develop within sponge cities. Air is cleaned from pollutants, buildings are insulated, space is available for leisure and food growth. These changes positively affect business, society, the environment and city economy.
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