Before revision: The revised equation is expressed as: where: Φ represents the stability parameter, which adjusts the formula for different construction types: φ = 1.25 at the end of a single layer of rock φ = 1.0 at the end of bed protection φ = 0.75 for two-layer rock bed protection φ = 0.50 for continuous bed protections the most conservative value is 1.5 .
After revision: The revised equation is expressed as: where: Φ represents the stability parameter, which adjusts the formula for different construction types: Construction Type Stability Parameter (Φ) End of a single layer of rock 1.25 End of bed protection 1.0 Two-layer rock bed protection 0.75 Continuous bed protections 0.50 Most conservative value 15 .