In excavation, what is the term used for the vertical distance between the two elevations?

The term used for the vertical distance between two elevations is referred to as "grade change." This terminology is commonly used in civil engineering and construction to define the difference in height between two points on a site. Understanding grade change is vital for excavating and grading work, as it directly impacts drainage, building foundations, and the overall topography of a site. Correctly identifying and calculating grade change ensures that appropriate measures are taken during excavation to achieve the desired land contours and surface levels.

In contrast, while "elevation difference" could seem similar, it is less commonly used in technical contexts. "Gradient" refers to the slope or inclination of a surface rather than just the vertical distance. "Slope" specifically relates to the angle of inclination, which does not measure just the vertical change but rather the ratio of vertical change to horizontal distance. Thus, "grade change" is the most precise terminology in this context, emphasizing the vertical distance and its implications in excavation practices.