What do widely spaced differing contour lines on a grading plan indicate?

Widely spaced contour lines on a grading plan indicate flatter areas. Contour lines represent changes in elevation on a plot of land. When these lines are far apart, it signifies that there is a gentle slope or minimal change in elevation over a given distance. This means the area is relatively flat, allowing for easier construction and less significant grading work compared to regions with closely packed contour lines, which would indicate steeper slopes and more drastic elevation changes.

In grading and construction, understanding the terrain through contour lines is essential for planning drainage, foundations, and overall land use effectively. In contrast, closely spaced contour lines would suggest steep slopes or rugged terrain, where elevations change rapidly over short distances, necessitating different construction approaches. The identification of flatter areas simplifies many aspects of land development and prepares contractors for the specific challenges that flatter versus steep or rugged terrains present.