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3,1. 2 Hazard Classification ,) H' " ,f y/~~ About 10 years ago, the Dam Safety Branch of the Division of Water Resources developed a hazard rating procedure based upon a weighted analysis using dam height, reservoir capacity, estimated evacuation and potential downstream damage, The procedure was used for several years and was the basis of the State's initial hazard ratings for the national inventory of dams. It was eventually replaced with the rating work for the National Dam Safety Program (NDSP). , ~ Included in the NDSP program are all artificial barriers jNl~,J!~ tog,et~, e ',With ,a,PP~\lant works ,):I.f!',iCh (1) ~}wentY7fp.ve fe~t o,r A " mor;e i h~ight 0"" (2) \have an . pounding apac'ity ifty ''I. acte- eet; or mole. N t incl ed ate bar iers wh i a e s' ~ or/~ss ~n hejght, re ardle s of sora capa i , or briers w~i haJe ~"storage apa ty at m xi urn wate stora elevation 06 fiftee~acre-feet ess regar ss of height, Below is a table setting out hazard ratings for federal and non-federal dams in Colorado. DAMS IN COLORADO Non-Federal Federal High 197 35 Moderate Low Total 327 10 1,605 75 2,129 120 Total 232 337 1,680 2,249 The hazards pertain to potential loss of human life or property damage in the area downstream of a dam in event structural failure or misoperation of the dam or appurtenant facilities, Dams conforming to criteria for the low hazard potential category generally will be located in rural or agricultural areas where failure may damage farm buildings, limited agricultural land, or township and country roads, Moderate hazard potential category structures will be those located in predominantly rural or agricultural areas where failur may damage isolated homes, secondary highways or minor railroads or cause interruption of use or service of relatively important public utilities. Dams in the high hazard potential category will be those located where failure may cause serious damage to homes, extnesive agricultural, industrial and commercial facilities, important public utilities, main highways, or railroads. The following table sets forth the extent of development with respect to loss of life and economic loss for each category adopted in Colorado, The State criteria with respect to loss of life is more stringent than the present federal criteria, ,,"