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, ~. 1: ~,. 5.j' ..,. SOME FLOODS IN THE ROCKY MOUNTAIN REGION. By ROBERT FOLLANSBEE and PAUL V. HODGES. c SCOPE OF REPORT. In 1923 severe Hoods occurred on the larger streams in Wyoming and a number of cloudburst Hoods on small streams in Wyoming and ~pecially in Colorado. An investigation of the principal Hoods in each State waamade, and the results are given in this paper, together with descriptions of two Colorado Hoods of 1922, In addi- tion a study waa made of all cloudburst Hoods to determiile the areaa chiefly subject to them. 1 -' " GENERAL FEATURES OF THE FLOODS. TYPES, Floods in the Rocky Mountain region are of two types-the Hoods in the larger streams due to general rains pf several days' duration over large areas and $,e so-called cloudhurst Hoods due to intense rains of short duration covering well-defined small areas, Floods of the first type are relatively infrequent, and, aa they are well under- stood, their characteristics will not be discussed, Ouly the severe Hoods of this type that occurred in 1923 are described in this report. Cloudburst Hoods cause the streams to rise and fall suddenly. Although they cause much less damage than those of the first type, they occur frequently and are especially disaatrous to railroads and highways. . AB.EAS SUllJECT TO CLOUDBURST FLOODS. Reeord~ of nearly 100 Hoods in Colorado were compiled to determine the areas most subject to cloudburst Hoods. . For many of these Hoods the available information covered only the date and location of the rises in small streams that were sufficiently pronounced to be called Hoods by residents. Most of these Hoods occurred in the eaatern foothill region, which extends from the New Mexico line on the south to the Wyoming line on the north, and in a strip of plains area 50 miles wide just east of the mountains. In this area the severest Hoods occurred between Canon City and Pueblo, in the trian"crular 105 ~ . .1; -g '. ;> :;; .~. :~