if you are refering to the lids that you see on the streets its that the lid will not fall into the hole, also most piping is circular
Sewers are typically circular in shape because this design efficiently withstands the internal and external pressures exerted on them. A circular cross-section distributes stress evenly around the pipe, reducing the risk of structural failure. Additionally, circular pipes are easier to manufacture and maintain, allowing for efficient flow and minimizing the risk of blockages. This shape also facilitates the natural flow of sewage, as it helps avoid settling and promotes self-cleansing.
Rob A. Kleijwegt has written: 'On sediment transport in circular sewers with non-cohesive deposits' -- subject(s): Sediment transport, Fluid dynamics, Sewerage
They were roman They were sewers They weren't in the shape of a teddy They were sewers
The sewers which are under the concrete slab
Tagalog Translation of SEWERS: mga mananahi
Because they don't like sewers.
Sewers - album - was created in 2008.
Sewers of Gold was created in 1979.
The Romans built sewers for the reasons one builds sewers: to channel and dispose of waste and for hygiene.
The duration of Sewers of Gold is 1.7 hours.
Pleasures Pave Sewers was created in 1999.
Four sewage disposal types include typical septic systems, sanitary sewers, storm sewers, and combined sewers.