Abstract: Disclosed is a drainage system (1) comprising: at least one water receiving unit (20) having: a water receptacle (22) for receiving water from an adjoining surface of an upper stratum; and at least one drainage unit comprising: a body; wherein: the water receptacle (22) can be integrated into the upper stratum; the drainage unit can be provided and oriented, at least in part, in a central stratum at a distance under the surface, with respect to its uppermost face, such that water flowing out of the water receiving unit (20) can flow into the drainage unit through a connection between the water receptacle (22) and the body; and the connection can be maintained irrespective of a change in this distance. Also disclosed are drainage units and methods.

Abstract: A frame system for a manhole covering includes at least one first frame element and one second frame element, each including at least one first connecting surface and/or at least one second connecting surface. The first and second frame elements are connectable to one another in a friction-locked and/or formfitting manner along the opposing first or second connecting surfaces, wherein in the connected state of the first and second frame element at least one joining region is formed between the opposing first connecting surfaces or between the opposing second connecting surfaces. The joining region can be filled using a joining element in such a way that the joined connection of the frame elements is detachable and reproducible wherein the joining element comprises a hot melt adhesive.

Abstract: Drainage systems are limited in performance and difficult to maintain. A drainage system is therefore specified, comprising at least one infiltration device (10, 40) adapted to receive fluid; a collecting device (30) which is in fluid communication with the at least one infiltration device (10, 40) and is adapted to receive fluid from the at least one infiltration device (10, 40) and to discharge it to a fluid system (4), wherein a gateway device (52) is provided, which is adapted to receive and transmit sensor data to a receiving unit (60); and at least one sensor (6, 6?, 7, 11, 11?, 14, 31, 31?, 32, 33, 41, 44, 42, 45) is provided, which is communicatively connected to the gateway device (52) for providing sensor data.

Abstract: An immiscible liquids separation apparatus (50) comprising: a vessel comprising a first separation chamber (66) and second separation chamber (72) being in first fluid communication with the first separation chamber (66), the first separation chamber (66) being situated above the second separation chamber (72); an inlet (52) arranged at the first separation chamber (66) to allow a liquid to flow into the vessel; a low-density liquid outlet (78) arranged on the second separation chamber (72) to allow low-density liquid separated from the liquid to be removed therefrom; and a high-density liquid outlet (60) arranged at the vessel to allow high-density liquid separated from the liquid to flow out of the vessel, and a corresponding method.