What does an existing line to the left of a proposed line on a contour map indicate?

On a contour map, an existing line that is positioned to the left of a proposed line typically indicates an area of "cut." This means that the proposed line—representing a new elevation—suggests that material will need to be excavated or removed to create that desired contour.

The existing contour line represents the current ground level, while the proposed line shows a new elevation that is lower than the existing terrain. Therefore, the presence of the existing line to the left indicates that the planned contour change requires lowering the elevation in that location, confirming the concept of a cut. This is fundamental in earthwork design and site grading, where understanding the relationship between existing and proposed elevations is crucial for proper site management and development.