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Question
According to IS : 875 part 3, design wind speed is obtained by multiplying the basic wind speed by factors k1, k2 and k3, where k3 is 
A.
terrain height factor
B.
structure size factor
C.
topography factor
D.
risk coefficient
Answer ( Option C)

topography factor

Solution

Modification factors to modify the wind speed taking in account the effect of terrain, topography and risk level.
 
Vz = Vb.K1.K2.K3..
 
Where,
Vz = design wind speed at any height Z in m/s.
K1 = Probability factor (risk coefficient)
K2 = Terrain, height and structure size factor
K3 = topography factor.

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