Floor drain sharing trap with rain water collection

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  #1  
Old 06-28-16, 11:30 PM
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Floor drain sharing trap with rain water collection

Where I live, downspouts must be connected into the sewer. I am replacing old cast iron pipes with pvc and wanted to know if I can have my basement floor drain share the same trap as my downspout. The old cast iron setup was this way, but it was also installed 100 years ago. I'm sure code has changed.

The positive of this is the trap will always have water in it. The negative I see is that if the trap gets clogged, the rain water will back up out the floor drain.

Are they allowed to share?

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Old 06-28-16, 11:48 PM
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Where I live, downspouts must be connected into the sewer.
That's pretty strange. In most areas.... mine included.... sump pumps and runoff water cannot be dumped into the sanitary sewer system.

The negative I see is that if the trap gets clogged, the rain water will back up out the floor drain.
That's a pretty big negative and can very easily happen with leaves and debris.
 
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Old 07-06-16, 08:19 PM
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Where I live, downspouts must be connected into the sewer.
Just to clarify, do you have two separate city sewers? One for sanitary sewer and one for storm drains?
 
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Old 07-10-16, 07:37 AM
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In most cases a floor drain must be connected to the sanitary sewer but often no one will notice if it just lets the water soak into the ground below or is connected to something else such as a dry well for gutter water.

The floor drain may be equipped with a check valve to prevent backing up.
 
 

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