The capital city of Denmark, Copenhagen, has adopted the concept of sponge city to address annual flood issues. The Northern European country incorporated this concept into the Cloudburst Management Plan in 2012. The sponge city concept was introduced by Chinese architect
Chinese landscape architect Kongjian Yu researched the sponge city concept in the late 1998. Natural wetlands will absorb water during floods and fill water reserves during droughts.
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Source: https://en.tempo.co/read/2041285/copenhagen-implements-sponge-city-concept-to-combat-flooding