What is the minimum allowable slope when a slope must be cut back due to distress?

The minimum allowable slope when a slope must be cut back due to distress is 1/2 horizontal to 1 vertical. This ratio indicates that for every 1 unit of vertical drop, there should be at least 2 units of horizontal distance, ensuring stability and reducing the risk of further degradation or collapse of the slope.

Properly managing slope angles is essential in excavations to prevent failures that can occur from excessive steepness, soil instability, or changes in water drainage. The ratio of 1/2 horizontal to 1 vertical is purposely designed as a conservative measure, creating a gentler slope that can better support the weight of soil and prevent erosion. In contrast, steeper slopes can lead to increased risks, especially in adverse weather conditions or when factoring in additional weight from construction materials or equipment.