由于城市化和流域内不透水面层的同时增加,雨水径流对河溪生态系统的破坏作用加剧。不透水面层的增加使风暴天气时的洪峰和流量增大、流量频率增加,后者导致河流生境的退化、污染负荷和生物损伤。目前认为雨水管理应着眼于自然排水过程的恢复以及群落水平上的小尺度分权效应。在雨水径流控制上,美国环境保护署(US EPA)最近把工作重点放在了所 Due to the simultaneous increase of urbanization and impervious surface layers within the river basin, the destructive effect of stormwater runoff on the river ecosystem is exacerbated. Increases in the impermeable surface layer increase the peak and flow rates during stormy weather and increase the frequency of the flow, which leads to degradation of habitats, pollution loads and biological damage in the river. At present, it is considered that rainwater management should focus on the restoration of natural drainage processes and the decentralization effect at the community scale. On stormwater runoff control, the US Environmental Protection Agency (US EPA) recently focused its efforts on