叙述了种植屋面的排水设计原则，提出可通过加大屋面排水坡度和种植介质表面排水坡度等措施，达到快速排放屋面积水的目的。

This article describes drainage design principle for planted roof, and puts forward that increasing drainage gradient of both roof and growing medium layer could speed up water discharge.

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屋面雨水排水采用虹吸排水系统较重力排水系统，具有管径小、所需管道安装空间小、悬吊管道无坡度、下水道连接管和埋地管少等优点。

Compared with gravity drainage system, it has the advantages of small pipe diameter and installing space, non-sloped suspended pipe, less sewage connecting and underground pipes and etc.

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