| 摘要 |
An emergency drain for dewatering an area (F) accumulating water via a discharge opening (6) connected to a drainpipe (4), with which water dammed up above a minimum dammed height (H) can be led away, having a weir (7) for damming up the water up to the minimum dammed height (H) and a top wall (8) arranged at a distance from the discharge opening (6) to prevent air being sucked into a vortex forming in the discharge opening (6), the weir (7) being arranged around the discharge opening (6) and the top wall (8), as seen from the discharge opening (6), extending as far as the other side of the weir (7), is improved with regard to the flow performance and the development of noise by the fact that the weir (7) has a cross section which, at the base of the weir (7) resting on the area (F), is provided in the flow direction (S) with a substantially greater width than at the highest point of the weir (7) over which the water flows.
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