Plumber Red Seal · Question
A sanitary building drain with a 2% (1/4" per foot) grade is installed over a horizontal distance of 12 metres. What is the total vertical drop of this pipe run?
A 2% grade means the pipe drops 0.02 metres for every 1 metre of horizontal distance. Over a 12-metre run, the total drop is 12 m * 0.02 = 0.24 metres, which is
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Question: A sanitary building drain with a 2% (1/4" per foot) grade is installed over a horizontal distance of 12 metres. What is the total vertical drop of this pipe run?
Answer options:
- 120 mm ✅ 240 mm
- 360 mm
- 480 mm
Correct answer: 240 mm
Explanation: A 2% grade means the pipe drops 0.02 metres for every 1 metre of horizontal distance. Over a 12-metre run, the total drop is 12 m * 0.02 = 0.24 metres, which is equal to 240 mm.
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