​​Why are manhole covers round and not square?​

​Manholes are an essential yet overlooked part of urban infrastructure. They provide access to the underground systems that are important for maintaining the flow of water, sewage, and electrical cables in cities. Without manholes, maintaining and repairing these systems would be incredibly difficult.These manholes might not look as useful, but go far beyond just being a cover for a hole in the ground. They help the workers to find and fix the concealed underground networks that keep our c