| 摘要 |
<p>A drainage unit (10) comprises first and second apertures (15,16) for allowing water to pass into the interior of the drainage unit. The first and second apertures are located such that, in use, the first aperture (16) is at a greater height than the second aperture (15). When the drainage unit is disposed at the side of a road, the first aperture is able to drain surface water from the road surface, and the second aperture is able to drain sub-surface water from within the road construction. The first aperture is not in direct fluid communication with the second aperture, so that surface water entering the drainage unit through the first aperture is prevented from passing back into the road construction through the second aperture. <IMAGE></p> |
