Guardians of the Drainage System
The city's underground drainage system relies on various manhole covers, which act like the city's "breathing holes." Common drainage manhole covers include rainwater manhole covers and sewage manhole covers. The former collects rainwater, while the latter is responsible for discharging domestic sewage. These manhole covers are usually circular in design, allowing them to withstand vehicle traffic and facilitating maintenance by workers.
Channels for Power and Communication
Besides the drainage system, power manhole covers and communication manhole covers are also common types in cities. Power manhole covers conceal electrical cables, supplying power to the city; communication manhole covers protect fiber optic and communication lines, ensuring uninterrupted network connectivity. These manhole covers are often marked with special symbols to remind people of safety precautions.
Other Specialized Manhole Covers
There are also other specialized manhole covers in cities, such as gas manhole covers and heating manhole covers. Gas manhole covers are used for gas pipeline maintenance, while heating manhole covers are related to the heating system. These manhole covers are usually made of special materials and have clear warning signs to distinguish them from ordinary manhole covers.
