Special engineering studies are required for slopes with an incline greater than which percentage?

The correct response regarding the need for special engineering studies based on slope incline pertains to a threshold of 8 percent. This percentage is significant because it indicates the level at which the potential for erosion, landslides, and other geotechnical issues becomes a concern in construction and land development. Slopes exceeding this incline require more rigorous analysis to ensure stability and safety, involving specialized assessments to evaluate soil composition, drainage, and potential stress factors on structures.

While other options provide alternative angles or lower percentages, they do not meet the recognized benchmarks that trigger the need for such in-depth studies. A slope of 6 degrees, for instance, does not directly correlate to the engineering standards established for safe land use and development in most regulatory frameworks, which tend to use percentage inclines for clarity. Hence, the threshold of 8 percent serves as a focal point for safety measures and engineering evaluations on steep terrain.