What is a Manhole?
A manhole is a covered opening in a paved area that allows access to an underground utility or infrastructure, such as sewer systems, telecommunications cables, electrical conduits, or gas lines.
The Purpose of Manholes
Manholes are designed to provide a point of entry for maintenance workers to perform inspections, repairs, and upgrades on underground systems. They also serve as ventilation points for sewer systems to prevent the buildup of dangerous gases.
Types of Manholes
- Round manholes
- Square manholes
- Rectangular manholes
Manhole Covers
Manhole covers are typically made of cast iron or concrete to withstand heavy traffic and prevent unauthorized access. They are often marked with utility company logos for identification.
Importance of Manholes
Manholes play a crucial role in maintaining the functionality and safety of underground infrastructure. Without proper access points, repairs and maintenance would be difficult and costly.
Case Study: New York City
In New York City, there are over 200,000 manholes that provide access to the city’s extensive network of sewer and water systems. These manholes require regular inspections and maintenance to ensure the efficient operation of the city’s utilities.
Statistics
According to the American Society of Civil Engineers, the United States has over 20 million manholes that are essential for the proper functioning of infrastructure systems.
