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“From area to area, you see cities being developed in a barely completely different approach,” explains Thomas Sagris, the digital water analysis lead at Arup. “For instance, among the cities in China, they are typically extra densely developed with high-rise buildings. In Auckland (New Zealand), you see extra low-rise buildings, extra areas between them.” A metropolis’s design impacts its capability to accommodate water, he says.
Each metropolis was assessed on three key components: the amount of water-absorbing inexperienced and blue areas corresponding to grass, bushes, lakes and ponds; sorts of soil and vegetation; and “water runoff potential” — a calculation of the quantity of rainfall that can run off the land, quite than be absorbed by it.
Terrain analyzes prime quality satellite tv for pc pictures to find and establish inexperienced and blue areas, and grey infrastructure, corresponding to buildings and pavements, inside a given city house. By incorporating extra knowledge units on parameters corresponding to soil high quality, the cities’ pure absorbency was calculated and expressed as a “sponginess rating.”
Ranked from highest to lowest in their general “sponginess” score, the seven cities surveyed have been Auckland (35%), Nairobi (34%), Singapore (30%), New York (30%), Mumbai (30%), Shanghai (28%) and London (22%).
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