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Table 3. Example of hazard matrix for hydropower plant showing hazards and required protective measures (Emergency classification: A: internal alert; B: developing situation; C: imminent situation)

HAZARDS Rehabi-litation Partial reservoir drawdown Full reservoir drawdown Evacuation Post-event evacuation
Floods A B C
Ice problems A
Earthquake C
Storm and lightning A
Abnormal instrumentation readings A B C
Spillway gates and equipment failure C C
Joint failure A C
Differential movement of structure A B C C
Embankment piping or seepage A B C
Electrical/mechanical failure and power plant shut-down A
Fire A B
Oil or hazardous material release A
Criminal action, sabotage, terrorism, acts of war B C
Human error A