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<br />when destruction or neutralization of the measure due to the <br /> <br /> <br />hazard is likely. Proper design~ of the measure and/or <br /> <br /> <br />diligent maintenance may prevent degradation of measure <br /> <br /> <br />performance. Hence, discussions of susceptibility serve as <br /> <br /> <br />. indicators of the kinds of hazards which deserve special <br /> <br /> <br />attention for each management tool. <br /> <br />Public acceptance of a management measure typically depends <br />on the following factors: aesthetics. disruption of the <br />community. perceived safety effects. and cost to the <br />individual. either directly or through taxes. Because fans <br />are typically completely dry except when actual flood events <br />occur. few citizens recognize the magnitude of flood <br />hazards. Natural flood channels on many fans are poorly <br />defined and highly irregular, making it difficult for <br />citizens to recognize parts of the fan which are susceptible <br />to flooding. Finally, the unstable nature of flood paths on <br />fans makes definition of a flood 'zone difficult and in many <br />cases results in much of the fan being classified as flood <br />plain. All of these factors contribute to a generally very <br />low level of acceptance for management tools on fans. <br /> <br />Planning studies may look at manaoement tool costs at <br />three levels: individual homeowner. government, and minimum <br />long-term cost for the entire community. Since certain <br />measures emphasize government costs (debris basins and <br />channels). while others place most of the burden on <br />homeowners or developers (elevation of structures). measures <br />can sometimes be selected to place the cost burden <br />ap?ropriately. <br /> <br />Management tools should be selected <br />considers: <br /> <br />through a.process which <br /> <br />. fan and watershed characteristics. <br />. the location and severity of hazards. <br /> <br />71 <br />