Snow fence , like a sand fence, is a barrier that forces in the wind, snow drifts accumulate in the desired place. They are primarily employed to minimize the number of snowdrift on the highways and trains. Farmers and ranchers use snow fences to create drift in the basin for ready water supply in the spring. The ski resort also uses a snow fence to increase the snow depth in certain areas, or for avalanche control.
A temporary snow fence is usually one of two varieties: orange plastic sheets attached to the stakes at regular intervals (the type normally used for construction fencing or temporary sports fencing), or cedar or light wooden paths and other wire fences, are also attached to the metal peg. A permanent snow fence usually consists of poles with horizontal board across it that cover more than half of the total area of ​​the hedge. The bottom 10% to 15% of the fence should be left open so that the snow does not fall directly below the fence, which will reduce the effective height. The higher fences trapped more snow. Taking a high fence as a unit, should be placed thirty-five units or more toward the wind from the road or building that is intended to protect. Permanent snow fences can also consist of lines of nearby shrubs, coniferous trees or corn stalks.
The snow fence works by causing turbulence in the wind, so it snows much of the snow load on the left side of the fence. Thus, the snow fence actually causes the snow to drift, rather than preventing it. The fence is placed in such a way that it causes snow to drift where it is beneficial, or harmless so that the snow does not drift into undesirable areas such as roads or between buildings.
Snow fences have been reported to save lives and reduce maintenance costs. The removal and control of snow and ice costs more than $ 2 billion annually in the US. The study published by the Strategic Highway Research Program (SHRP) of the National Research Council in 1991 showed that mechanical snow removal cost 100 times more than catching snow with a fence.
Video Snow fence
See also
- Snowman, device attached to the roof to prevent snow falling to people below
- A snow barn, designed to snow above
Maps Snow fence
References
External links
- "Effective Snow Fence" on YouTube
- Plan a 3 meter Wyoming snow fence.
- Plan a 3.6 meter Wyoming-style snow fence.
- "What's That Thing: Roadside Fence Edition", by Mark Vanhoenacker, Slate, August 1, 2013
- Snow fences: do they still serve the purpose?
- Build an effective Snow Fence - Better than a good idea
Source of the article : Wikipedia
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