Where Likely Sources of Debris Flows Are a Short Distance

Where likely sources of debris flows are a short distance upstream and the channel gradient is high, ____.

A) a trip wire is more effective than an acoustic flow meter for debris flow warnings
B) sirens should not be used in debris early warning systems
C) warning time for a debris flow may be too short to allow for evacuation
D) the danger to humans from a debris flow is minimized
E) debris flows and mudflows will never be covered by flood insurance

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