1 城市雨洪资源合理利用是城市化发展的要求1.1 城市的用水量和需水量急剧增加,水资源供需矛盾加剧,迫切需要加大对城市雨洪资源的利用。2000年与1980年相比,我国城市生活用水增加了3倍,工业用水增加了1.5倍,城市的绿化、消防、环卫用水也大幅度增加。用水的急剧增加,使我国许多城市水资源供求形势日趋严峻。据统计,全国有400多座城 1 Reasonable Utilization of Rain-flood Resources in Cities is the Requirement of Urbanization Development 1.1 Water consumption and water demand in cities have sharply increased, and the contradiction between supply and demand of water resources has intensified. Therefore, it is urgent to increase the utilization of urban stormwater resources. Compared with 1980, the water consumption of urban living in our country increased threefold in 2000 and that of industrial water increased 1.5 times. The urban greening, fire fighting and sanitation water consumption also increased substantially. The drastic increase in water use has made the supply and demand of water resources in many cities of our country increasingly severe. According to statistics, there are more than 400 cities nationwide