They are numerous valuable reasons why manhole / pothole shapes are always in round shape. They are
1. Circular shape is the only shape where you can twist and turn but it cannot fall into its own opening. Similar shape which possess the same property as circle is reuleaux triangle (its a curve of constant width).
2. Round shape is the strongest shape against the earth compression.
3. Round shape has much smaller area and its easier to build with the low cost.
4. Round shape can be easily moved and rolled.
5. Round shape cover need not to be rolled or aligned while placing them on the circular opening.
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Daily Maths Topic Today - why manhole shapes are round.