The channel (1) has a lower part (2) provided with a drainage channel (3). An upper part (4) is arranged above the lower part in an operating position. The lower and upper parts are provided as components separated from each other. The lower and upper parts are supported at a ground (16) separately from each other in the operating position. The upper part includes upper part side walls (5) downwardly pointing in the operating position. The drainage channel includes drainage channel side walls (6) upwardly pointing in the operating position. An independent claim is also included for an arrangement.
