What is the maximum allowable slope for soil type class B?

The maximum allowable slope for soil type class B being 45° is based on the stability and the shear strength characteristics of that soil type. Class B soil is typically recognized for having moderate stability and adequate drainage properties, which allows for a steeper slope compared to less stable soil types.

Engineering principles dictate that soil stability decreases as the slope angle increases. For Class B soil, the 45° angle reflects a balance between maximizing land usage and ensuring safety against erosion and landslides. This slope is deemed manageable for construction and other activities while minimizing environmental risks.

In contrast, lower angles, such as those associated with the other choices, indicate a more conservative approach to stability that may not fully utilize the potential of Class B soils. Therefore, recognizing 45° as the maximum allowable angle aligns with engineering best practices for maintaining safety and structural integrity in environments where Class B soil is present.