| Surface condition | P factor | |
|---|---|---|
| Bare soil loose | 1.0 | |
| Freshly disked or rough irregular surface | 0.9 | |
| Compact smooth by equipment up and down hill | 1.3 | |
| Compact smooth by equipment across slope | 1.2 | |
| Contoured furrows | ||
| Slope (%) | Maximum downslope length (ft) | P factor |
| 1-2 | 350 | 0.6 |
| 3-5 | 250 | 0.5 |
| 6-8 | 200 | 0.5 |
| 9-12 | 125 | 0.6 |
| 13-16 | 75 | 0.7 |
| 17-20 | 60 | 0.8 |
| >20 | 50 | 0.8 |
Source: NYDEC, 2005.