日本东京的“首都圈外围排水系统,它建造于1992年至2006年之间,共耗资30亿美元,是世界上最大、也是最先进的下水道排水系统。排水系统全长6.4公里,包括5个高65米、宽32米的巨型竖井,竖井之间由内径约10米的管道连接起来。前4个竖井里导入的洪水通过下水道流入最后一个竖井,集中到由59根高 Tokyo, Japan, ”The metropolitan area’s peripheral drainage system, built between 1992 and 2006, costing a total of $ 3 billion, is the largest and most advanced sewer drainage system in the world." The drainage system is 6.4 kilometers long and includes 5 65 meters high, 32 meters wide giant shaft between the shaft by the diameter of about 10 meters of pipe connected to the first four shafts into the flood through the sewer into the last shaft, concentrated by the 59 high