The first sewerage system "in Japan can be seen in the large communities in the Yayoi Period (approximately 2,200 years ago). In the Nara Period (about 1,300 years ago), a drainage system network ran throughout the city in the Heijo-kyo capital area. In the Azuchi-momoyama Period (approximately 430 years ago), a stone culvert called the Taiko Sewerage was built around Osaka Castle."
That was way back & what you saw was no way less than amazing. So who were the ones who made all this difference? These are the people who have achieved it:
Partners who supported sewage works:
Ministry Of Land, Infrastructure & Transport.
Project Operating Bodies.
Japan Sewage Works Association.
Japan Sewage Works Agency.
Japan Institute Of Wastewater Engineering Technology.
JSWA holds "Sewage Works Exhibition every year where the latest sewage technologies are exposed. It is a place where information is provided or sewage works businesses and products can be seen in hand and also a place where information is exchanged to help the mutual development of technology in future."
Japan Institute of Wastewater Engineering Technology (JIWET) "was established for the purpose of promoting introduction of new Technologies into sewerage works to make them efficient and smooth....."
And after seeing these photos one needs to say yes they all had worked very well & one gets the feel that some of these screen are from computer game.
IMAGES COPYRIGHT 2005 EDOGAWA RIVER OFFICE, ALL RIGHTS RESERVED.
Source: 1, 2, 3, 4 & 5.
The World's Biggest Hole
The World's Deepest Water-Filled Sinkhole - El Zacatón Cenote