How ‘sponge cities’ can protect coastal towns from flooding

Sponge cities,” an approach first introduced in China in 2013, are a nice example of this in practice. The idea of a sponge city is that rather than using concrete to channel away rainwater, it is best to work with nature to absorb, clean and use the water. So, much like a sponge, the cities are designed to soak up the excess stormwater without becoming over-saturated.