A $16 \mathrm{~m}$ high wind break is constructed to protect soil from wind erosion due to wind velocity of 18 $\mathrm{m} \mathrm{s}^{-1}$ at $15 \mathrm{~m}$ height. The minimum wind velocity at $15 \mathrm{~m}$ height capable of moving the soil fraction is $8 \mathrm{~m} \mathrm{~s}^{-1}$. The angle of deviation of prevailing wind direction from the perpendicular to the wind break is $30^{\circ}$. The distance of full protection from the wind break in $\mathrm{m}$ is

(A) 60.44

(B) 104.69

(C) 306.00

(D) 530.01

A $16 \mathrm{~m}$ high wind break is constructed to protect soil from wind erosion due to wind velocity of 18 $\mathrm{m} \mathrm{s}^{-1}$ at $15 \mathrm{~m}$ height. The minimum wind velocity at $15 \mathrm{~m}$ height capable of moving the soil fraction is $8 \mathrm{~m} \mathrm{~s}^{-1}$. The angle of deviation of prevailing wind direction from the perpendicular to the wind break is $30^{\circ}$. The distance of full protection from the wind break in $\mathrm{m}$ is

(A) 60.44

(B) 104.69

(C) 306.00

(D) 530.01

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