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During an analysis of an existing sanitary sewer crossing a proposed building site, it was determined that the outflow invert at one manhole was 120 feet and the inflow invert at the next manhole, which is 200 feet downstream, was 117 feet. What is the percentage of slope between the two manholes?
Correct Answer: A
Reference: NCARB ARE 5.0 Review Manual, Site Design and Civil Engineering chapter Sanitary sewer design principles and slope requirements
