为解决北京水资源紧张，北京将投资６０００多万元，与德国合作启动“城区雨洪控制与利用”项目。工程完工后，可用雨水冲洗卫生间、喷洒路面、灌溉绿地、洗车、涵养地下水等。该工程利用自来水管网，一网两用，可自动切换自来水管网和雨水供水系统。 该项目已在北京的４个示范 In order to solve the water shortage in Beijing, Beijing will invest more than 60 million yuan to start the project of “Control and Use of Urban Rain Floods” in cooperation with Germany. After the completion of the project, it is possible to wash the bathroom with rain water, spray the pavement, irrigate green areas, wash the car, conserve groundwater and so on. The project uses water pipe network, a net dual-use, can automatically switch the water pipe network and rainwater supply system. The project has four demonstrations in Beijing