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Like Lazy Pup said floor drains go into a grey area and often times gutter drains join them. The latest thinking in many areas is to separate combined sewers into separate sanitary and storm sewers. This lessens the load put on water treatment plants during heavy rains. Lessening the likelyhood of plant overflows. Storm water does not recieve treatment.
The skinny is we can't tell from here!
If you had some sweet water in your basement I would get your drains looked at ASAP. The person that you hire to clean them should be able to give you some advice, as to whether or not they are combined or, separate.
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I stayed at a Holiday Inn Express last night.
Now I can Plumb! 
For great information on the history of sanitary sewers including the use of Redwood Pipe
Visit http://www.sewerhistory.org/
Did you know some Redwood Pipe is still in service today.
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