TM 5-803-13/AFM 126-8
(1) When plants are used as a wind barrier, wind
a lateral distance of 10 to 15 times the height of the
can generally be affected for a lateral distance of 2 to 5
barrier on the leeward side (fig 2-15).
times the height of the barrier on the windward side and
(2) Plants tend to be better windbreaks than fences
(3) The depth of a shelter belt, or wind screen, has
or walls because they permit some degree of wind
no real effect on the amount of wind protection provided;
penetration. The effective distance of wind control on the
the primary factors influencing effectiveness are the
leeward side is increased by use of penetrable screens
height and density of planting (fig 2-17).
because less turbulence is created. A planting density of
about 60 percent offers maximum effectiveness (fig 2-
16).
2-10
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