Drain assembly

The invention relates to a drain assembly (29) for roof drainage, comprising a drain device (3) and an inlet device (1), wherein the drain device (3) has a pipe piece (18) and at least one retaining element (6), which is preferably connected to the pipe piece (18), and wherein the inlet device comprises a covering part (4) for covering the pipe entrance (2), the covering part having lateral passages (21), through which water can be fed to the pipe entrance (2), and a functional part (5), which is arranged below the covering part (4). The functional part (5) is selectively a damming functional part (7) that defines a damming height (S) or an emergency overflow functional part (8) having an inlet (26) that defines an inlet height (E), wherein the damming functional part (7), the emergency overflow functional part (8), and the covering part (4) can be fastened to said at least one retaining element (6).