flat roof drainage 平屋面排水
Waterlogged soils occur in areas that are flat or have poor drainage.
涝渍土壤发生在地势平坦或排水不畅的地区。
Flat sites can present serious problems for the drainage of waste and storm water.
地势平坦的地点可能会有污水排放和暴雨后积水的严重问题。
When the Banks have been crested, the surrounding land becomes the river, with he water moving across flat land in a sheet, toward whatever is the drainage point.
当河岸的顶部被洪水淹没之时，周围的土地就变成了河流，河水成片地朝着平坦的地势流动，无论何处都成了排水点。
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