Avalanche control
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To combat avalanches effectively a detailed knowledge of the properties of snow is essential. We must understand this subject and in particular why avalanches start on one slope and not on another. Furthermore we must know how avalanches travel, what speeds they can reach, and what effects of their forces can be predicted. A first distinction to make is between snow which has retained its initial structure, that is a snow cover which has settled naturally, and snow the initial structure of whi ch has been more or less completely destroyed by fractures.