Old city gutter drains with traps

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Old 10-24-11, 12:52 PM
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Old city gutter drains with traps

I live in an old part of the city with combined sewers. The house has old 4" clay pipe for the gutter drains, and each downspout connection appears to have a 4" clay trap about 3' underground, above the horizontal clay drain. Near the street appears to be a 3" vent at ground level, and most houses appear to have these vents.

Trying to understand how this is supposed to work. Isn't there a large trap right before the main sewer pipe, under the street? If so, do I really need these traps at every downspout connection? If there was much sewer gas, I would think I would smell it at the vent by the street. And if there is a little sewer gas, I would expect it to go up the downspout or up the street vent. Seems like overkill to replace these traps when I'm repairing the drains.
 
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Old 11-01-11, 04:44 PM
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Any thoughts on this? How important is it to keep these traps? Thanks.
 
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