Wadis, as constructed in the Netherlands, are based on a natural principle from northern Africa and southwest Asia, where gullies or streams stay dry unless it is the rainy season. As green infrastructure, it is a natural area with lowered ground surface that has the capacity to hold water when it rains.
Three examples in Enschede show different approaches to this principle. The first example shows a wadi made next to the main street, connected to a new sewage system that anticipates larger rain storms and has a higher storage capacity.
The second example shows a specialized drainage system starting at the roofs of the houses, where rainwater is redirected towards the center of the street, instead of the gutters normally found on the sides of the street. From the center of the street, shallow gullies move the water towards a nearby pond.
The third example has a park where a wadi is made, with special stepping stones for children to play in, whether it is dry or wet.
All of these examples help delay and decrease flood peaks, and help restore ground water levels.
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