I have two 60 year old floor drains in basement. Both connect to sump pit which collects water from them and the perimeter drain. I dont think they have a trap because neither have a cleanout plug and a snake and hose goes into them easily. However, there is standing water in them as if it has a trap.

I ran a significant amount of water thru them with a hose and the water flowed into the sump pit. They did not back up at all but the water level remained as if it has a trap.


If there is no trap and the water indicates a stoppage, wouldnt they have backed up when I ran water thru them?



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if the hose goes in easily, it should slide all the way to the sump.
or at least if the hose is too large or too soft stick a wire down there.

I put 50' of 3/8 snake into one of the drains, the sump is only 15' away... im guessing i was in the perimeter drain tile.


The water level in that drain never changed when running the hose. Is it safe to assume if the standing water was not a trap, then it would have backed up?



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the only other answer could be a pipe with a negative pitch.
probably never clogged because it was only clean ground water ?