A river or stream may be blocked by many things, damming normal flow. Since these are accidental eventsthe dams are unstable and tend to be transient.
Obstructing Material
Association
ice jam
winter
landslide
earthquake
trees
deforestation event
Features:
(1) occurrence of triggering event
(2) blockage of water flow with accumulation
(3) eventual dam collapse with downstream flash flooding
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Specialty: Emergency Medicine