Practice Quiz

Civil Engineering PE

Category - Wastewater

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What is the change in elevation between the upstream invert and the downstream invert of a 400-foot (ft) section of 8-inch diameter sewer pipe set at a 4.5% slope?
  1. <2 ft
  2. 4.5 ft
  3. 18 ft
  4. Not enough information provided
Explanation
Answer: C - The change in elevation of a 400 ft section of 8-inch diameter sewer pipe set at a 4.5 % slope is 18 ft.

Solution: Elevation change = Length of pipe x slope

Given, 4.5 % slope = 4.5 ft / 100 ft

Elevation Change = 400 ft x 4.5 ft / 100 ft

= 18 ft
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