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Avalanche control
Avalanche control or avalanche defense activities reduce the hazard avalanches pose to human life, activity, and property.〔("Mitigation and Land Use - Avalanches" ), Colorado Geological Survey〕 Avalanche control begins with a risk assessment conducted by surveying for potential avalanche terrain by identifying geographic features such as vegetation patterns, drainages, and seasonal snow distribution that are indicative of avalanches. From the identified avalanche risks, the hazard is assessed by identifying threatened human geographic features such as roads, ski hills, and buildings. Avalanche control programs address the avalanche hazard by formulating prevention and mitigation plans, which are then executed during the winter season. The prevention and mitigation plans combine extensive snow pack observation with three major groups of interventions: active, passive, and social sometimes more narrowly defined as "explosive", "structural", and "awareness", according to the prevalent techniques used.〔 Avalanche control techniques either directly intervene in the evolution of the snow pack, or lessen the effect of an avalanche once it has occurred. For the event of human involvement, avalanche control organizations develop and train exhaustive response and recovery plans.
==Risk and hazard assessment==
Risk assessment for geographical surveys for potential avalanche terrain by studying topography, vegetation, and seasonal snow distribution. Hazard assessment geographical surveys for the consequences of avalanche by studying exposure of urbanization, industrialization, transportation, recreational activities, and the distribution of human use of the potential avalanche terrain identified in the risk assessment.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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