Roads, highways, and buildings are the main features of modern cities. Along with those hard layers of landscape, there is leftover terrain with scarce vegetation. Many of these forgotten lands constitute “terrain vague” (De Sola Morales). These hard layers of our cities have many impacts on our environment. One of the most significant is the rapid increase in the level of runoff as the ground is not able to absorb water. This problem causes a high risk of floods in various parts of the world.
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