Heavy Equipment Operator Certification Exam Prep · Question
A 400 mm diameter sanitary sewer pipe must be installed at a slope of 0.8%. If the invert elevation at the starting manhole is 102.500 metres, what should the approximate invert elevation be at a manhole 75 metres downstream?
The change in elevation is 75 metres * 0.008 (0.8%) = 0.600 metres. Since it's downstream, the elevation decreases: 102.500 metres - 0.600 metres = 101.900 metr
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Question: A 400 mm diameter sanitary sewer pipe must be installed at a slope of 0.8%. If the invert elevation at the starting manhole is 102.500 metres, what should the approximate invert elevation be at a manhole 75 metres downstream?
Answer options: ✅ 101.900 metres
- 101.975 metres
- 102.000 metres
- 103.100 metres
Correct answer: 101.900 metres
Explanation: The change in elevation is 75 metres * 0.008 (0.8%) = 0.600 metres. Since it's downstream, the elevation decreases: 102.500 metres - 0.600 metres = 101.900 metres. This calculation is fundamental for ensuring correct gravity flow in sewer systems.
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