城市雨水径流管理对解决水源、洪水、污水等问题具有重要意义，近年来受到国际上的广泛关注。

Great attention has been paid to efficient runoff management, which is helpful for solving the above water problems.

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城市雨水径流污染物组分复杂，浓度变化大，可生化性差，排放间歇且无规律，故处理起来难度较大。

The components in the urban stormwater runoff are very complicated, and its range of concentration change is very big, so it is very difficult to dispose of the urban stormwater runoff.

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城市雨水径流特别是初期雨水污染严重，是水体富营养化、华以及海域赤潮等环境问题产生的根源之一。

Urban runoff pollution is serious especially for earlier runoff and it is one of the reasons that lead to water body eutrophic algal bloom and red tide on sea.

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