Only then did they lay out the various districts of the city. Even if it lacked underground sewers, the Song dynasty capital of Bianjing had 253 open-air sewers. To prevent people from throwing garbage in them and clogging them up, the city had regular inspection patrols.
即使沒有鋪設衛生下水道，城市裡有兩百五十三條溝渠讓汙水排出的宋朝首都汴京（開封），為了防止老百姓將垃圾倒入溝內堵塞流水，開封府派人專門巡邏督察。