Safety of Dams Flood and Earthquake Criteria (1985) / Chapter Skim
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Extreme Floods and Earthquakes -- The Nature of the Problem
Extreme Floods and Earthquakes -- The Nature of the Problem
Pages 8-14
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From page 8... ...
. Some people have the mistaken impression that dams, especially government-built flood control dams, are designed and operated to protect property and residents downstream against all floods that could conceivably occur.
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From page 9... ...
It is not possible to provide absolute safety against all hazards and especially from events produced by "mother nature." The objective should be to balance the benefits of making dams safer against the cost of the increased safety and to reduce any risks to acceptable proportions. Objectives for either design or safety evaluations of clams relating to extreme floods ant]
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From page 10... ...
The discrepancies arise primarily from the technical, scientific, and moral issues underlying the professional judgments of the estimators as well as the lack of a quantitative definition of exactly what a PMF represents. Moral issues are involved because a dam owner may make economic decisions involving risks to others without the input or consideration of those at risk.
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From page 11... ...
Government by its own actions and by using its authority to regulate the behavior of inclivicluals has generally satisfied the public desire for increased safety. It has not, however, provided explicit target levels for acceptable risk as matters of public policy.
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From page 12... ...
Devising appropriate policies for assessment and management of risk has become a dominant dilemma of this decade. REASONABLE CARE AND PRUDENCE IN DAM DESIGN For the reasons discussed above, selecting the amount of protection from floods or earthquake resistance that should be included in the design of a clam is in the final analysis a matter of judgment.
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From page 13... ...
The current procedures used for selecting the spillway design flood (SDF) attempt to delimit reasonable care by acknowledging that the level of protection provided should reflect consideration of the hazard potential of the dam (viz., loss of human life, property damage, dam services, opportunity costs)
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From page 14... ...
To a lesser extent perhaps, the similar concept of a limiting earthquake magnitude (the maximum credible earthquake MCE) has provided a basis for preventing dam failures resulting from seismic events.
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