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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.
Do no block the manholes!
The Sanitary Authority requires free and clear access to its manholes in case of emergency. Covering or placing decorative planters on top of manholes makes them difficult to locate in adverse conditions.
Heavy planters could inadvertently be damaged by Sanitary Authority staff attempting to move them. More importantly, lifting heavy planter could injure workers in their attempts to access the manhole for maintenance or in the event of a backup. CTSA Rules and Regulations governs the policy for excavation and raising of buried manholes to grade.