It is a critical basis for utilization of rainfall resource and pollution control of runoff in urban area to understand runoff quality and its main influential factors.

掌握城区雨水径流水质及其主要的影响因素是有效地利用城区雨水资源和控制城市非点源污染的基础。

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The major control factor of water quality is precipitation and runoff.

降雨和径流为三亚湾海域水质参数变化的控制因子。

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The characteristics of runoff pollution are analyzed, the necessity of the runoff pollution control is summarized, and the control techniques of runoff pollution are mainly discussed in this paper.

分析了径流污染产生的特点，概括了城市雨水径流污染控制的必要性，并着重论述了径流污染控制技术。

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Too much of this irrigation water is lost to evaporation, the water coverage is hard to control and wasted runoff can occur.

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