It took costs and pains to design and construct the outdoor gravity drainage system when complicated topography and longer pipelines were encountered.
进行室外污水重力排水设计、施工时，遇到复杂地形或管线较长时，既费成本又废心血。
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.
与重力排水系统相比，具有管径小、管道安装要求空间小、悬吊管无坡度、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.
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。
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