屋顶排水沟 roof valley ; roof gutter ; Valley Gutter
屋顶排水口 roof drain
偶角屋顶排水沟 [建] cut-and-mitred valley
屋顶斜沟排水槽底板 valley board
屋顶花园防水排水探讨 Guangdong Building Materials
雨水也从屋顶排水及种植保存。
Rainwater is also drained from the roof and saved for plantings.
平的屋顶排水差。
一些屋顶排水沟的挡板式设计打破了排水水流交换落水管，所以它不会削弱地下。
Some roof gutter exchange downspouts for baffle type designs break up the stream of drained water, so that it does not erode the ground below.
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