The sewer cover

The sewer cover

There are three good reasons why sewer covers are round.

Can you think of which ones?


  • A round lid cannot be cast through the hole it covers, unlike a square lid that could fall.
  • Round covers can be rolled to their location since they are generally quite heavy.
  • It is not necessary to orient the cover to cover the hole unlike a square cover that is necessary to place it in the correct position.