1前言日本的下水道遗迹可以追溯到古代的弥生集落时代,模仿中国长安的都城,在藤原京(694年),平城京(710年),长冈京(784年),平安京(794年)的时代规划道路的同时,已在道路两侧设置了水沟,到了江户时代,当时拥有庞大人口的江户发展了各种排水设施。因日本的都市没有城墙,可以容易? 1 Introduction Japan's sewer relics can be traced back to the ancient Yayoi period, imitating the capital city of Changan in China, and were the first in the era of Fujiwara (694), Pingcheng (710), Nagaoka (784), and Pingjing At the same time of planning the roads, ditches have been set up on both sides of the road, and by the Edo period, Edo, which had a large population at the time, developed various drainage facilities. Because the Japanese city without walls, can be easy?