On a site grading plan, what do contour lines that are close together indicate?
Correct Answer
C) Steep slope
Contour lines that are close together indicate steep slopes, while lines farther apart indicate gentler slopes. This is fundamental to reading topographic information.
Why This Is the Correct Answer
Contour lines represent points of equal elevation on a topographic map. When these lines are close together, it means there is a significant change in elevation over a short horizontal distance, which by definition creates a steep slope. The closer the contour lines, the steeper the terrain. This is a fundamental principle of topographic mapping that contractors must understand for proper site analysis and grading work.
Why the Other Options Are Wrong
Option A: Flat terrain
Flat terrain would be represented by contour lines that are far apart or widely spaced, indicating minimal elevation change over a large horizontal distance.
Option D: Underground utilities
Property boundaries are shown by property lines, lot lines, or boundary markers on site plans, not by contour lines which only represent elevation changes.
Memory Technique
Use the acronym 'CLOSE = CLIMB': When contour lines are CLOSE together, you have to CLIMB steeply. When they're far apart, it's a gentle walk.
Reference Hint
Site Work and Utilities chapter in contractor reference materials, or Grading and Excavation sections that cover topographic plan reading
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