What is the particle size range for silt in soil classification?

The classification of soil particles is essential for understanding their behavior and suitability for various applications, including the construction and operation of On-Site Sewage Facilities (OSSFs). Silt is defined as soil particles that fall within a specific size range that influences how the soil interacts with water and nutrients.

The correct size range for silt is from 0.002 mm to 0.05 mm. Particles within this range are small enough to retain moisture yet large enough to allow for good drainage and aeration. This characteristic makes silt significant in soil management, especially in applications that require a balanced mixture of drainage and nutrient-holding capacity.

Understanding this classification helps in designing appropriate drainage and treatment systems, as the size of soil particles directly affects the soil's permeability and its ability to filter contaminants, which is crucial for OSSF systems.