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Thanks for the reply. The drain will connect to area drain lines in the yard. It will not connect to the sewer system. I know that I don't "need" a P-trap as in a sewer connection since I won't be dealing with any sewer gas. The reason I was going to use the P-trap configuration was because...

I am installing a drainage system in an atrium that has one exterior wall. That wall has the same type of grade beam as the other 3 walls. The grade beam is 10 inches thick. I have measured the various elevations between the atrium and the existing positive drainage in the yard that I will...