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Vegetations (roots) act to stabilize hillside soil, healthy topsoil contain bugs that burrow & raise porosity allowing rain to pass through space in rocks, raindrops will hit leaves & land gently on soil
Wildfire removed vegetation, remaining soil consist of ash & clay, water cannot be soaked up by soil
This has less porosity & will not absorb water as well & water run straight off
Unloading the head
Reinforcing the body
Supporting the toe - stop downward movement of materials
Modifying drainage to reduce water flow over/within the unstable slope