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With the climate change, Copenhagen has seen an increase in cloudbursts. During the cloudbursts, sewer systems overflow and result in flooded basements and overspill of untreated water into the harbour. A solution to the limited capacity is to make cloudbursts reservoirs to delay the rain water filling the sewer system. At Langelands Plads in Copenhagen, a reservoir has been established using the stonewool product Rockflow. The Rockflow is installed under two roads and a space used for recreational purposes. Based on monotonic and cyclic laboratory tests, material parameters and appropriate numerical model for the anisotropic material were established. In-situ measurements of the stiffness during and after installation at Langelands Plads consisted of plate load tests and falling weight deflectometer tests together with rutting measurements. The in-situ measurements were statistically processed and back-analysed to confirm the initial material parameters and model. Further, the in-situ measurements are ongoing at appropriate intervals to monitor the performance of the road.

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