| Particle Fraction | Size (µm) | Percent of TSS | USDA Size class |
|---|---|---|---|
| P0% | NA1 | 0% | NA |
| P10% | 2-8 | 20% | Clay, very fine silt |
| P30% | 8-20 | 20% | Fine silt, medium silt |
| P50% | 20-60 | 20% | Medium silt, Course silt |
| P80% | 60-200 | 40% | Very fine sand, Fine sand |
| 1 used for dissolved pollutants | |||