the current status of rainwater utilization in cities of our country, as well as the quality of rainwater runoff and influence factors thereof were summarized;
总结了我国城市雨水利用现状;城市雨水径流水质及其影响因素;
the reasons of cratering and influencing factors thereof are introduced. the theories in terms of 「impact of reverse ion flow」and 「induced electric field」are proposed.