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<br />Colorado Landslide Hazard <br /> <br />Rock fall <br />Rock topple <br />Rock slump <br />Rock block slide <br />Rock slide <br /> <br />impacts when landsliding does occur. Three general <br />methods are used to accomplish these goals: <br /> <br />[] modification of community vulnerability, <br /> <br />[] modification of the physical system, and <br /> <br />[] modification of the consequences. <br /> <br />Vulnerability to landslide hazards is a function of a <br />site's location, type of activity, and frequency of <br />landslide events. Exposure to landsliding can be re- <br />duced by restricting or prohibiting certain uses in <br />landslide areas or by imposing conditions on hazard <br />zone activity. <br /> <br />Exposure to landsliding can be reduced by restrict- <br />ing or prohibiting certain uses in landslide areas or <br />by imposing conditions on hazard zone activity. Lo- <br />cal governments can accomplish this by: <br /> <br />[] adopting and enforcing grading and building <br />codes, <br /> <br />[] instituting appropriate land use regulations and <br />policies, <br /> <br />[] implementing compatible redevelopment restric- <br />tions, <br /> <br />[] developing hazard-monitoring and warning sys. <br />tems, and <br /> <br />TYPE OF MOVEMENT <br /> <br />FALLS <br />TOPPLES <br />ROTATIONAL <br /> <br />FEW <br />UNITS <br />--- <br />MANY <br />UNITS <br /> <br />SLIDES <br /> <br />TRANSLATIONAL <br /> <br />LATERAL SPREADS <br /> <br />FLOWS <br /> <br /> <br />A Rotational Landslide <br /> <br />[] supporting emergency preparedness programs. <br /> <br />Land use regulations and policies are most effective <br />when enacted prior to development. However, when <br />potentially hazardous land is privately-owned with <br />the expectation of relatively intense development <br /> <br />TYPE OF MATERIAL <br />ENGINEERING SOILS <br /> <br />BEDROCK <br /> <br />Rock spread <br />Rock flow <br /> <br />Predominantly coarse Predominantly fine <br />Debris fall Earth fall <br />Debris topple Earth topple <br />Debris slump Earth slump <br />Debris block slide Earth block slide <br />Debris slide Earth slide <br />Debris spread Earth spread <br /> <br />Debris flow <br /> <br />I <br />(soil creep) <br /> <br />Earth flow <br /> <br />COMPLEX <br /> <br />Combination of two of more principle types of movement <br /> <br />(deep creep) <br /> <br />Abbreviated Venion of Varnes' 1978 <br /> <br />25 <br />