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<br />PART III
<br />Chapter 9
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<br />IMPLEMENTATION. . . . . , . . . . . , .. . , , . . , , . . . , . . , . . . . , , . 75
<br />IMPLEMENTATION OF THE COLORADO LANDSLIDE
<br />HAZARD MITIGATION PLAN . . . . . . , , . . , . . , . . , , , . . . . . , . . . 77
<br />General Strategies. . . . . . . . , . . . . . , . . . , . . . . . . , . . , . . , . . . . 77
<br />Strategy Implementation . . . .. .. . . .. , , .. .. .. . . .. , .. , . . .. 77
<br />Critical Action Projects. . . , . , . , , . . , . . . , . , , . . . . . . . . . . 77
<br />Secondary Action Projects .. .. .. . . .. . . .. . . .. . .. , . . .. 78
<br />Follow-upProjects ..........,....,......,.....,... 78
<br />Creation of Future Projects .. . .. .. . . . .. .. . .. .. , . , .. , .. .. 78
<br />Suggested Projects. . .. . . . .. . . . . . .. . , , . , . .. . . .. . .. . . , . . 78
<br />Critical Action Projects. .. . .. , .. . .. .. . , , . . , . .. .. .. , . 78
<br />Secondary Action Projects .. . . . .. , , . .. .. . . . . . .. , . , .. 84
<br />Follow-up Projects ,..........,.......,. . , . . . . . , . . . 87
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<br />GLOSSARy........ ..,....,. ......"",......',... ,... 93
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<br />BffiLIOGRAPHY . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . , , . . . . 97
<br />APPENDICES. . . . . , . . . . . . . . . . . . , , , . , . , . . . , . . . . . . . . . . . 101
<br />1. Methods of Landslide Evaluation and Analysis,. . ,... , ., 101
<br />2. Non-physical Mitigation Techniques .....,.."..... ,. . 105
<br />3. Physical Mitigation Methods ........................ 121
<br />4. Agencies With Landslide Hazard Responsibilities and Existing
<br />Plans and Programs ........... . .. .. .. .. .. .. , .. .. .. 129
<br />5. Three Cas~ Histories of Landsliding in Colorado. . . . . . . . 135
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<br />FIGURES
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<br />Generalized map showing the relative potential for landsliding in Colorado and the sur- ..
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<br />rounding states. . . . . . . . , . , . . . , . . . . . . . . . . , . . . . . . . . . . . . . . . . . , , . . . . , . . , . . . . 8
<br />The 1975-1985 monthly and accumulated precipitation departures from the 20-year average
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<br />for Eagle, Colorado ......,............,.......,...,...,.,..,....,......, 9
<br />Abbreviated version of Varnes' classification of slope movements. . , , , . . , , . . . . . , . . 11
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<br />A rockfall. , . . . . . . . . . . . . . . . . , . . . , . . . , . , . . . . . , . . . . , . . . . , . . , , . . . . . , . . . . . . . 12
<br />Rocks in the process of toppling .. .. . .. .. .. .. .. .. . . .. .. . , . . , .. . .. . , . . .. , .. . 12
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<br />A rotational slide. . . . , . . . . . . . . . . . . . . . , , , . . . . . . . , . . " . , . . . , , . . , , . . . . , . , . . . . 13
<br />A translational slide ,...",..,..................,...,.".,...,.,....,..,... 13
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<br />A block slide, . . , . . , . , . . . . . . . . . , . . . . . , . . . . . . . . . . ., . , , . . , . , , . . . . . . . . . . . . . 13
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<br />A lateral spread. . . ... . .. .. . . .. .,. . .. '.,... ...... , , . , . , .. . , . , . '" , . ., .. ,. 13
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<br />Creep ......,....................",..".....,.,...",...,....,.,',... 14
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<br />Debris fan . , . . . . . . , . . , . . . , , . , . . . . . . , , , , . . . . . , , . , , , . . , . . , , . , , , . . . . , , , , . , 14
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<br />An earthflow . , . . . , . . . . . . . . . . , . , . . . , . . . . . . . , . . , . . , . . , . . . . . , , . . , , . . . . , . , . 1"
<br />Maximum historical earthquake intensities in Colorado. . , . . . . . . . , . . . . . , . . . . . . , . 20
<br />Detail from the landslide inventory map of the Durango 1 () x 20 quadrangle, Colorado 25
<br />Detail from the Morrison quadrangle folio showing areas :susceptible to landsliding . , 26
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<br />viii
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