It is of great significance to study changing rules of urban rainwater runoff generation and runoff water quality during precipitation process, which would develop the theory of urban hydrology and facilitate the collection and utilization of urban rainwater resources. By simultaneously monitoring urban runoff generating process and its water quality in precipitation events from June to August during 2010~2011, the changing rules of urban rainwater runoff and its water quality are preliminarily analyzed. Result shows that there exists significant liner relationship between rainwater runoff and precipitation, and significant power function relationship between runoff depth and runoff water quality. Initial runoff water on concrete road and roof surface is badly polluted. Initial 4mm runoff is identified to be discharge quantity of initial rainwater of concrete road. Initial 3mm runoff is identified to be that of concrete roof.%研究城市降雨径流量及径流水质对城市水文学理论扩充及城市雨水资源集蓄利用具有重要意义.通过对2010～2011年保定市区6～8月份降雨产流过程中屋面、路面等类型下垫面的降雨径流量及径流水质的同步监测,初步分析了城市降雨径流量及径流水质的变化规律.研究结果表明:不同屋面及路面降雨径流量与降雨量均呈现相关性显著的线性关系;城市水泥路面及屋面降雨径流水质随径流量的变化呈现出相关性显著的幂函数关系.产流初期水泥路面及屋面降雨径流水质较差,确定产流初期4 mm径流量为水泥路面的初期弃流量,产流初期3 mm为水泥屋面的初期弃流量.
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