Drainage Element

The drainage element 10, particularly for handling run-off from roads, car parks, etc., comprises at least one liquid holding part 11 provided with an inlet and an outlet 18. The drainage element is, in use, positioned substantially adjacent at least one other drainage element with liquid only being able to pass through the inlet and outlet such that liquid is prevented by the liquid holding part from flowing from the drainage element to the at least one other drainage element. The element may comprise a number of liquid holding parts with liquid being prevented from moving from any one to any other. Each liquid holding element is preferably channel shaped and, in use, is placed such that its base is substantially horizontal. The liquid holding parts and each inlet are preferably elongate to receive a sheet flow of liquid and the inlet may comprise a number of apertures. The element may comprise an upper element, such as a kerb part or grating, in which the liquid inlet is provided. The liquid holding part may include a baffle and weir arrangement to help retain floating contaminants in the liquid holding part. Also claimed is a drainage system.