What is the manhole cover with the words pipe network written on it?

Pipe network manhole cover-underground pipe network, each user unit has its own pipe network.

Water, municipal, electric, hydraulic. Netcom gas, tap water, sewage and other users.

The manhole cover says "rain" or "pollution"

Sewers are distributed under the roadway.

Usually, drainage wells are distributed near residential buildings in residential areas and also in the middle of primary and secondary roads. Covers for telecommunications, natural gas, communication cables, heating and septic tanks are usually on sidewalks.

. Most urban sewage pipe networks are built under the driveway, so once the manhole cover is damaged or water accumulates in the center of the heavy rain road, please avoid it in time, because these lead directly to the sewage pipe.

Net, falling into it directly endangers life. The manhole cover says "rain" or "pollution"

Most manhole covers are mainly round. But not all round manhole covers are sewer manhole covers. There are many kinds of manhole covers on urban roads, except sewer manhole covers.

Water, electricity, gas, communication cable, septic tank manhole cover, etc. The words "rain" or "pollution" are generally written on the manhole cover to distinguish it from other manhole covers.