Pipes are used for transporting water below ground, for example, to avoid the danger of having open trenches in heavily trafficked streets, to minimise evaporation or to rapidly convey water away from the area (see figures 1 and 2).

RÝr 1
Figure 1: Pipes transport water underneath a road  (Photo: A. Backhaus)

RÝr 2
Figure 2: Transporting water by pipe (Sketch: A Backhaus)

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