When calculating slope gradient, which factor is irrelevant?

In the calculation of slope gradient, the essential factors to consider are the vertical rise and the horizontal run, as these directly contribute to determining how steep the slope is. The slope gradient itself is defined as the ratio of the vertical change (rise) to the horizontal change (run), often expressed as a percentage or fraction.

The soil type, while important in many aspects of earthworks and construction—such as stability, drainage, and compaction—does not influence the basic geometric calculation of slope gradient. The formula for slope gradient depends solely on the measurements of the rise and run, making any influence of soil type irrelevant for this specific calculation.

Consequently, when analyzing slope gradient, it is critical to focus on the actual measurements of rise and run to accurately assess steepness, without the need to consider the characteristics of the soil.