West Virginia Contractors License Practice Exam

What is the maximum slope limit of safety for permanent fill?

1. 1 to 1

2. 2 to 1

3. 3 to 1

4. 4 to 1

The correct answer is: 2 to 1

The maximum slope limit of safety for permanent fill is typically set at a ratio of 2 to 1. This means that for every 2 units of horizontal distance, there can be a vertical rise of 1 unit. This slope is considered stable enough to prevent erosion and sliding, making it safer for both the fill material and any structures that may be placed on or near it. A slope steeper than this could increase the risk of failure due to gravitational forces acting on the fill material, especially in conditions of heavy rain or seismic activity. While some applications might allow for varying slopes based on specific engineering assessments, a 2 to 1 slope is generally regarded as a good balance between safety and space efficiency in construction practices.