This content is in Draft and has not been professionally reviewed. It is provided for preview while expert review is in progress.
DEVELOPMENT FIXTURE — Fast-moving mud and debris flow is approaching or passing your area.
The essentials if you need to act right now.
Leave valleys and streams. Climb high ground immediately.
What might I see? Observable signs — no diagnosis required.
DEVELOPMENT FIXTURE — Rumbling during rain, muddy river rising fast, or hillside scar above.
DEVELOPMENT FIXTURE — Bridge shaking or water turning thick and brown upstream.
Optional deeper explanation — not required to act.
DEVELOPMENT FIXTURE — Debris flows are liquid-like mixtures of mud, rock, and water moving 30+ km/h.
DEVELOPMENT FIXTURE — They follow stream channels and spread onto floodplains without warning.
Check the scene before you approach.
Civilian-safe actions you can take.
DEVELOPMENT FIXTURE — Leave canyon, gully, or dry wash immediately when rain is heavy uphill.
DEVELOPMENT FIXTURE — Move up slope — not downstream ahead of flow.
DEVELOPMENT FIXTURE — Warn campers and drivers in channel paths.
DEVELOPMENT FIXTURE — Stay on high ground until rain stops and authorities inspect.
When and how to get professional help.
DEVELOPMENT FIXTURE — Evacuate channels and low valleys immediately. No rescue attempts in active flow.
DEVELOPMENT FIXTURE — Call 112 from high ground with description of flow path.
DEVELOPMENT FIXTURE — Report vehicles or structures in channel when flow started.
DEVELOPMENT FIXTURE — Anyone caught needs immediate extraction — suffocation occurs within minutes.
Dangerous actions, when not to attempt rescue, and common myths.
DEVELOPMENT FIXTURE — Do NOT camp in dry stream beds even when sky is clear upstream.
DEVELOPMENT FIXTURE — Do NOT drive through moving mud on roads.
DEVELOPMENT FIXTURE — Dry stream beds are safe campsites during clear weather
DEVELOPMENT FIXTURE — Storms miles upstream can send debris flows through dry channels with no local rain.
DEVELOPMENT FIXTURE — Campers buried by surprise midnight debris flow.
Other scenarios in the same family.
Aftershock
DEVELOPMENT FIXTURE — The ground shakes again after the main earthquake.
Avalanche warning
DEVELOPMENT FIXTURE — Avalanche danger is high on slopes where you are traveling or living.
Buried in avalanche
DEVELOPMENT FIXTURE — You or someone nearby is buried in avalanche snow.
Compound disaster
DEVELOPMENT FIXTURE — Multiple disasters overlap — e.g. earthquake and tsunami, cyclone and flood.
DEVELOPMENT FIXTURE — Areas below burn scars flood and debris-flow more intensely.