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The concern for dam safety has also resulted in the creation of organizations devoted to dam safety, for example, the International Commission on Large Dams (ICOLD). In many countries dams have been classified according to the hazard potential; the class 'high' generally indicates that the failure or mis-operation will probably cause loss of human life. Dams assigned a high hazard potential should fulfil very strict technical and hydrological criteria in their construction and maintenance. Emergency Action Plans and Early Warning Systems are necessary non-structural tools to minimize the impacts of dam failures.