What is the maximum allowable slope in type C soil?

The maximum allowable slope in type C soil is 1 1/2:1, which indicates that, for every 1.5 units of horizontal distance, there can be a 1 unit vertical drop. This particular slope ratio is considered appropriate for type C soils under normal conditions as it takes into account the characteristics of such soils, which are typically loose, moist, and very low in cohesion. These properties can make them less stable than soils with higher cohesion levels, thus a more conservative slope is necessary to ensure safety and prevent excavation collapse.

In practical applications, adhering to this slope ratio helps in maintaining the integrity of excavations and ensuring worker safety. Type C soils require a gentler slope compared to soils with higher stability, which is reflected in the recommended slope ratios for various soil types.