If no drainage system exists, the water table rises, bringing dissolved salts to the surface.

如果没有排水系统，地下水位就会上升，把溶解的盐带到地表。

youdao

The urban rainfall runoff pollution originates from the precipitation, the urban surface and the drainage system.

城市降水径流污染中的污染物主要来自降水、城市地表和排水系统。

youdao

The drainage design of urban highway deals with only the surface run-off. It presents a new drainage system considering the road surface, pavement structure, and subgrade (including green belt).

城市快速路排水设计，一般只考虑路面径流的做法，主要从道路表面、路面结构内部和路基(包括绿化带)三方面时排水进行综合介绍。

youdao

An estimated 100-150 tons of debris was spread across the road and torrential rainfall blocked the drainage system, causing severe flooding on the road surface.

BBC: Scotland