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Big Daddy P Trap


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Are those drain lines for roof drains?

I have seen roof drain lines going into the combination sewer system in Chicago. They had a big cast iron catch basin, before the line left the building. Those catch basins (usually 36" deep) were always filled with gravel/pebbles from the roof.


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There are roof and patio drains.

I built a system like you described in a laundromat. In NYC... in most cases storm drains are not allowed to drain into a sanitary sewer. It adds too much water to the sewerage treatment plants. If you don't have a storm sewer (new construction), you have to install dry wells. That is another scam story.

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