Surface friction lengths (Zo) and minimum friction heights (Zmin) (Adopted from Euro Code).
|Terrain No||Terrain type||Zo (m)||zmin (m)|
|0||Coastal areas exposed to open sea||0.003||1|
|I||Lake shores and flat open areas with no obstacles||0.01||1|
|II||Areas with low vegitaton and isolated obstacles where the average obstacle separation is more than 20 times the average obstacle height.||0.05||2|
|III||Villages and suburbs, where the average obstacle separation is less than 20 times the average obstacle height.||0.3||5|
|IV||City centers and similar areas, where more than %15 of the terrain is covered with structures taller than 15 m.||1.0||10|
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