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德国的马路旁常能看见长满绿草的浅沟,这可不光是为了美观,浅沟下面其实用石、沙、土埋了好几层,据专家介绍,它们是用来留存、过滤雨水的。德国并不缺水,有必要这样大费周折吗?柏林水务公司污水处理部门负责人延斯·克斯腾的回答是肯定的。他说,柏林雨多,年均降雨量达580mm,雨水冲刷机动车路面后,易被油污、橡胶、金属或防冻剂等污染,因此,不能任其直接渗入地下,即使将其排到下水管道再处理也不经济。浅沟不仅解决了这些问题,而且还可在降暴雨时缓和管道压力。类似的滤水沟或地下水库在柏林有100多处,可同时储存雨水
Germany’s roadside often can see covered with green grass shallow ditch, this is not only for the beautiful, shallow trench below the practical stone, sand, soil buried several layers, according to experts, they are used to retain, filter the rain . Germany is not lack of water, it is necessary so much work is going on it? .. Berlin Water Company sewage treatment department head Jens Kersten answer is yes. He said that the rainy season in Berlin, with an average annual rainfall of 580mm, is easily polluted by oil, rubber, metal or antifreeze after the rain has washed the surface of motor vehicles and therefore can not be directly infiltrated into the ground even if it is drained to sewer pipes Reprocessing is not economical. Shallow ditches not only solve these problems, but also ease pipeline stress during heavy rains. Similar ditches or underground reservoirs in Berlin have more than 100 places, which can store rainwater at the same time