Proper slope for drain line
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#5
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Join Date: Feb 2002
Location: hawaii
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the self scouring capabilities of drainage piping works beast at 1/4 inch per foot. Piping 4" in diameter and larger can be run at 1/8 inch per foot WHEN THERE IS NOT ENOUGH fall to make 1/4 inch.
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The PVC fittings, i.e. elbows, T's, Y's, etc are biult with the appropriate slope built in this manner. A 90* elbow is not actually 90*. It is just a bit more than 90* (how much more needs a better mathmetician than I) so that if a percectly straight piece of pipe were inserted into it, it would drop 1/4" per foot. This does not however take flex of the pipe into account. I just did a DWV run that had a 30' horizontal run, so some care had to be taken to support the pipe well so that it didn't get any dips. If you are doing short runs where the pipe remains relatively rigid, the built-in slope should be plenty accurate for slope.
Bob
Bob