| Depth (cm) | Cohesion C (kPa) | Internal Angle of Friction (φ) | Shear Strength (kPa) |
| 0 - 10 | 5.36 | 23.06 | 21.71 |
Machakos | 10 - 20 | 7.69 | 27.00 | 29.60 |
| 20 - 30 | 6.30 | 27.39 | 28.07 |
| 0 - 10 | 7.35 | 27.39 | 30.02 |
Kitui | 10 - 20 | 6.43 | 29.28 | 32.86 |
| 20 - 30 | 8.43 | 31.72 | 39.29 |