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But why exactly are manhole covers round? The glib answer is that the covers are round because the manholes themselves are round. The longer answer is that a host of practical, functional, engineering and economic decisions play into the decision to make something like a manhole cover round, said Josh Nelson, an associate professor in the Department of Design at San Jose State University in California.

Whether this obstruction was done by a previous owner or yourself, a buried manhole interferes with our ability to gain access to our lines to perform appropriate service and maintenance. Therefore, as the present owner or the premises, you are required to uncover or raise the manhole(s) to grade in accordance with the Sanitary Authority’s specifications for Sewer Line Installations. You may contact this office to obtain the specifications, and to arrange for an inspection of the completed work.

Moreover, vacuum garbage cans are designed for efficiency, using advanced technology to ensure that waste is compacted and stored in a manner that maximizes space. This compaction reduces the frequency with which bins need to be emptied, leading to lower transportation costs and decreased carbon emissions associated with waste collection. By making waste management simpler and more efficient at the household level, vacuum garbage cans can significantly contribute to a broader culture of sustainability.