Why do the rainfall thresholds for debris flows and landslides for California semiarid regions and
Contra Costa and Marin Counties in Central California vary? What will be an ideal response?
Semiarid areas have little vegetation and abundant loose surface debris. There are few root systems to
retain the weak soils. Less rainfall Intensity/duration is needed to start a debris flow or landslide. The
differences between Contra Costa and Marin Counties are due to topography (Marin is steeper) and
geology (Marin has less cohesive rock).
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