Firstly arrived in Japan, people will be surprised to find that the main road and the main car road surface can not see the drainage covers in Japan Road. Driving on this road, you will never worry about the bump and ‘bang’ voice when a car ran over the covers.
Thus, The main road in Japan do not really have any road manhole covers? Well, not exactly, but the drainage covers are buried in the asphalt pavement below, so as to maintain clean pavement. But Japan is very rich in rainfall, and that if the manhole covers buried beneath the asphalt, how do the road rainwater and sewage drain it?
In fact, you will find carefully that the main road drainage covers are actually on both sides of the road. In the left and right ends ( close to the sidewalk location ) of road pavement, every few meters there is a rectangular shaped fence covers, which covers called ” road rainwater filter grate,” Here is a small gutter grate. Finally, the water will flow into the driveway drains, gutters and underground drainage wells under the asphalt pavement is connected, water will eventually flow into the well by a large drainage channels system.
Also in the Japanese city, often can see some not wide, but a bit like a deep river canal, these canals and roads often linked. Due to the low lying drains, rain, snow, etc. tend to flow to drains, to a large extent eased the pressure on road drainage. This design not only makes driveway clean, we would not have been repeatedly rolling covers the vehicle and cause loose, but also reduce the covers “missing” brings security risks. However, on a non- trunk, non-lanes, especially on the road in a residential area, you will often see many colorful drainage covers with rich patterns, which has become a unique landscape of Japan.