roof drainage

Roof top and facade secondary structure can effectively reduce the out-of-plane calculated length of the primary chords, and provide support conditions for ETFE cladding structure, acoustic ceiling at the bottom chord and roof drainage system, forming the lateral force resisting system for the structure.

屋顶与立面次结构可以有效减小主结构弦杆面外的计算长度，提供ETFE膜结构、下弦声学吊顶与屋面排水系统的支承条件，并形成结构的抗侧力体系。

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A flat roof has poor drainage.

平的屋顶排水差.

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Gravity drainage systems inside buildings-Roof drainage, layout and calculation.

自流排水系统,屋面排水设计.

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The emergency drainage device is an important device in floating roof tank, used to drain the overloaded water accumulated on the floating roof to ensure a safety for oil tank.

浮顶油罐紧急排水装置是浮顶油罐上的一个重要的附件，其主要作用是排出浮顶上的超载积水，保证油罐浮顶的使用安全。

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There are some qualifications when the siphonic roof drainage system is designed.

虹吸雨水排水系统对管道设计有一定要求.

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