14 x 42 ironing board cover_eetkamertafelhoes

Cast iron manhole covers are manufactured in factories known as foundries, with a casting process made up of five simple steps:

Within the manhole there are a range of sub-components; it’s much more than just a hole. So now we know the basics, let’s jump in (not literally). 

Composite (fiberglass) manholes are commonly used in applications where infiltration, exfiltration, or corrosion by hydrogen sulfide (from sewer gas) are a concern, or where structures need to be factory integrated into a manhole before placement. In these manholes, the entire underground enclosure is constructed of some composite material, in addition to the cover.

In addition to managing water runoff, storm manhole covers must also address environmental concerns. Cities are increasingly recognizing the need for sustainable practices in managing stormwater. Innovative designs now incorporate permeable materials that allow water to filter through the cover, reducing the immediate volume of runoff and promoting groundwater recharge. Such advancements represent a shift toward more eco-friendly infrastructure solutions, highlighting the balance that urban planners must strike between functionality and sustainability.