收集屋面雨水，属于落水系统的组成部分，集中引至地面以下铺设的雨水管内。 落水管材质可分为：1、金属管材（如铸铁管、彩铝管、铜质管等）；2、塑料管材（如PVC管等）；
清理沟里的烂树叶、树枝和其他碎屑，并确保落水管远离房屋。
Clear gutters of old leaves, twigs and other debris and ensure downspouts are away from the house.
铅衬水槽和落水管用于处理沉淀。
Lead lined gutters and downspouts are used to deal with precipitation.
建筑改进了落水管和排水沟。
Architectural innovations continue to the downpipes and gutters.
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