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    At its most basic, yes, a manhole is a hole in the ground with a cover. But manholes and their covers vary in the materials used to make them and the specific purpose they serve. Here are the most common types of manholes used today:

    In more recent years a variety of alternative materials have increased in popularity when it comes to manufacturing manhole covers. This is due to many issues associated with cast iron manhole covers. Some of the top drawbacks of cast iron manhole covers include scrap metal theft, injury to workers associated with the weight, and corrosion.