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Carpenter Red Seal Exam Prep · Question

A road grade is specified as a constant slope of 0.5% (fall). If a grade stake at chainage 0+000 (0 metres) has a design elevation of 100.000 m, what is the design elevation at a grade stake located 150 metres away (chainage 0+150)?

A 0.5% fall over 150 m means a change in elevation of 0.005 (slope conversion) × 150 m = 0.750 m. Since it's a fall, the elevation decreases: 100.000 m - 0.750

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Question: A road grade is specified as a constant slope of 0.5% (fall). If a grade stake at chainage 0+000 (0 metres) has a design elevation of 100.000 m, what is the design elevation at a grade stake located 150 metres away (chainage 0+150)?

Answer options: ✅ 99.250 m

  • 100.750 m
  • 99.500 m
  • 100.500 m

Correct answer: 99.250 m

Explanation: A 0.5% fall over 150 m means a change in elevation of 0.005 (slope conversion) × 150 m = 0.750 m. Since it's a fall, the elevation decreases: 100.000 m - 0.750 m = 99.250 m.

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