Which soil type is considered the least stable?

Type C soil is classified as the least stable type of soil according to the Unified Soil Classification System. This classification indicates that Type C soils typically have low shear strength and higher susceptibility to failure under load. They often consist of loose, granular materials or silts that are more prone to erosion and instability, particularly when saturated with water.

In practical scenarios, this means that construction and excavation activities in Type C soils require additional precautions, such as shoring and bracing, to ensure safety and structural integrity. The characteristics of Type C soil make it essential for water operators and related professionals to recognize its limitations in stability to mitigate risks effectively.

Understanding the stability of different soil types helps operators assess potential hazards and implement appropriate engineering controls, which is crucial when working in the field. This knowledge ultimately contributes to safe and effective management of water operations and maintenance of infrastructure.