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1 前言随着经济和社会的不断发展,人类在水资源利用方面的需求将会不断增长。以前,城市水资源主要着眼于地表水资源和地下水资源的开发,不重视对城市汇集径流雨水的利用而任其排放,造成大量宝贵雨水资源的流失。随着城市的扩张,雨水流失量也越来越大。一方面是城市的严重缺水,地下水过量开采,地下水位逐年下降,另一方面大量地排放雨水又带来城市水涝、城市生态环境恶化等一系列严重的环境问题。现在,有越来越多的人认识到雨水利用是
1 Introduction With the continuous development of economy and society, the human demand for water resources utilization will continue to grow. In the past, urban water resources mainly focused on the development of surface and groundwater resources. They did not attach importance to the discharge of run-off rainwater collected from cities and caused the loss of a large amount of precious rainwater resources. With the expansion of the city, the loss of rainfall is also growing. On the one hand, there are a series of serious environmental problems such as serious water shortage in cities, over exploitation of groundwater, declining groundwater level, and heavy rainwater discharge, resulting in urban waterlogging and urban ecological environment deterioration. Now, more and more people realize that rainwater utilization is