17. The dam failure consequence category is determined on the basis of the characteristics of the downstream area, barring exceptions, that would be affected by the dam failure and takes into account, from among a number of dam failure scenarios, the one that would result in the highest consequence category. Those characteristics are assessed in terms of population density and the extent of downstream infrastructure and services that would be destroyed or severely damaged in the event of a dam failure. The consequence categories and a description of the characteristics used to determine each category appear in Schedule V.