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I am looking for some help on a formula, please..
what is the rise of a 4" waste line running 100' ?
I'm not sure I understand what you are asking. If you are asking what the fall is on a 100' waste line it would depend on what it's grade is. At 1/4" per foot it would be 25". At an 1/8" per foot it would be 12.5".
"Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony