Landslide Risk Calculator
Slope stability factor from soil, angle, and water table.
Inputs
Results
Factor of Safety
0.88
Stability (0-3)0
Shear strength (kPa)20.67
Shear stress (kPa)23.38
Critical slope angle (°)26.5
Critical soil depth (m)1.94
How to Use This Calculator
- Measure or estimate the Slope angle (°) from topographic data or a clinometer.
- Enter Soil thickness (m) above the potential slip surface — from field investigation or auger logs.
- Set the Friction angle (°) and Cohesion (kPa) from laboratory shear-strength tests or published soil tables.
- Adjust the Saturation ratio (0–1) to represent dry (0), partially saturated (0.5), or fully saturated (1) conditions after heavy rainfall.
- Read the Factor of Safety: values above 1.5 indicate stability, 1.0–1.25 are conditionally unstable, and below 1.0 means failure is expected.
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