One of the primary reasons for the prevalence of round recessed manhole covers is their functional design. The round shape eliminates the possibility of the cover falling into the manhole, a risk associated with square or rectangular covers. Regardless of the orientation, a round cover cannot be accidentally dropped into the opening, thereby promoting safety for pedestrians and vehicles alike.
Manhole
The inner bucket serves as the primary receptacle for waste. When it gets full, users can simply remove the bucket, dispose of the waste, and clean the bucket before placing it back in the outer container. This process streamlines waste disposal and minimizes the mess often associated with traditional dustbins, where users have to reach into the outer container to clean it or deal with spillage.
Lifting keys will be used in pulling manhole covers to make it easier. Since it is your hand and back that will take the risk of doing it, proper way to do it should be known.