Why are manhole covers round?

There are several reasons why manhole covers are typically round:

1. Safety:

A round shape prevents the cover from falling into the hole. Unlike other shapes, such as squares or rectangles, a round cover cannot fall through the opening as it will always have a larger diameter than the hole itself.

2. Ease of handling:

Round covers can be easily rolled or moved in any direction, making them easier to handle and transport. This is particularly important when considering the weight and size of manhole covers, which can be quite heavy.

3. Structural integrity:

The circular shape of a manhole cover distributes weight evenly across its surface, making it more structurally sound and less prone to cracking or breaking under heavy loads. Other shapes, such as squares, have corners that are more susceptible to stress and damage.

4. Cost-effectiveness:

Manufacturing round manhole covers is generally more cost-effective compared to other shapes. The simplicity of the round design requires less material and labor, reducing production costs.

Overall, the round shape of manhole covers provides practical and functional advantages in terms of safety, handling, structural integrity, and cost-effectiveness.

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