Many construction teams in Coventry assume that steep slopes only fail after heavy rain. That is a dangerous oversimplification. Debris flows can start with moderate rainfall when the soil profile is already saturated. We have seen projects stall because the original ground investigation missed the presence of colluvium layers. A proper debris flow analysis identifies the trigger mechanisms, the travel path, and the deposition zone. Without it, you are building blind on unstable ground.
Understanding the soil layering and permeability is the difference between a safe slope and a costly failure in Coventry.