Treatment plant inlet T below water line internally

[daunker]

Just concreted in treatment plant (marsh), and looked inside. The inlet T is below the waterline. It's filled with water and flows between chamber and to outlet fine. But I was just curious about this. Is this how it should be possibly to airlock/gases(?)

 

In my head I was concerned about anything coming down having to be pushed down into the liquid below or it could cause a backup. Ok most stuff should sink, but was just not sure.

 

Thanks!

 

 

[nod]

I can’t see the outlet 

But as long as the outlet is flowing 

It will be fine 

[daunker]

This is the outlet yes it flows out fine! Thanks @nod