| 摘要 |
<p>Drainage device for rainwater (1) collected on a substantially horizontal surface (6) of a pavement or a roof which has a drainage orifice, this device including a baseplate (8) provided with a drainage opening (16) and designed to be capable of being installed on the said surface, this opening (16) communicating with the said drainage orifice, and a gravel fillet (trap) (9) consisting of a set of perforated walls surrounding the said drainage opening (16) so as to allow water to pass through and to retain the gravel (23), characterised in that it includes a water retention frame (10) arranged on the baseplate (8) so as to surround the said drainage opening (16) and having one or more calibrated openings (15) which regulate the drainage flow rate. <IMAGE></p> |
