What is the maximum allowed slope on a finish grade during backfilling?

The maximum allowed slope on a finish grade during backfilling is significant for ensuring stability and preventing erosion. A 50% slope, which corresponds to a 1:2 ratio, provides a balance between adequate drainage and the structural integrity of the backfill material. This slope is steep enough to facilitate efficient water runoff while maintaining a manageable angle to minimize the risk of soil slips and collapses.

Higher slopes, such as those represented by 75% or 100%, would substantially increase the risk of failure due to gravitational pull on the soil particles, especially in saturated conditions. A 25% slope, though safer, may not be steep enough to allow for effective drainage in many scenarios, potentially leading to water pooling and associated issues. Therefore, a 50% slope becomes the most practical and widely accepted standard in backfilling operations, achieving both safety and functionality in grading.