• The following links may help:

https://www.quora.com/What-is-pipe-invert-elevation

https://www.hunker.com/12003029/how-to-calculate-invert-elevations

Gang Chen, Author, Architect, LEED AP BD+C (GreenExamEducation.com)

• Many thanks!

• Typically, they either give the slope or are asking for the slope. On your exam day you may get one question that you need to include the pipe size and one you will not. Be prepared, its not automatic, but it should be obvious in the question/diagram. Read everything carefully. Continue working practice questions. Remember, there will be no trick questions, just tricky. And watch your units.

• What is the answer then? One of those links says measure to the bottom of the inside of the pipe, the other says measure to the middle. I'm guessing you measure from grade, but the diagram looks like the 2'-8" measurement is to the bottom of the manhole cover. Is the thickness of a manhole cover a standard that we're expected to memorize?

• Correct me if I am wrong, but I believe the answer would be 223.0' - 2'-8"-  3'-4" - 1'-0" = 216.0'. Invert elevations are always to the bottom of the inside of the pipe (where water would be flowing). I do not think you take into consideration the manhole cover depth as it is not given (manhole cover depth is probably not the same as pipe thickness, two totally different things in my mind). This is a confusing question though, more information is needed.

• i am googling the internet to study for ARE exams again.
does anyone have a problem set with an answer somewhere or a written example so i can review this topic.
or does anyone have a definitive answer? is it 216 feet?
WHERE IS RHE INVERT IN THE ILLUSTRATION PLEASE? is it the “invert in”? “invert out”? are these two the same? different?
it’s like little red riding hood trying to track this stuff down.