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Notation

c_dir = Directional factor
c_season = Season factor
v_b = Basic wind velocity
v_b,0 = Fundemantal value of the basic wind velocity

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The fundamental value of the basic wind velocity, v_b,0, is the characteristic 10 minutes mean wind velocity, irrespective of wind direction and time of year, at 10m above ground level in open country terrain with low vegetation such as grass and isolated obstacles with separations of at least 20 obstacle heights.

The fundamental value of the basic wind velocity, v_b,0 , may be given in the National Annex.

The basic wind velocity v_b

The value of the directional factor, c_dir, for various wind directions may be found in the National Annex. The recommended value is 1,0.

The value of the season factor, c_season, may be given in the National Annex. The recommended value is 1,0.

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