Soil and Water Conservation Engineering · Soil and Water Erosion · 2 marks · Numerical answer
A windbreak is 15 m high and 200 m long. Threshold wind speed at 15 m height is 9.6 m/s;5-year design wind16 m/s, deviating20° from normal to the barrier. Find protected area in ha, to two decimals.
Using the source’s empirical sheltered-distance relation,$d=17h(V_{threshold}/V)=17(15)(9.6/16)=153$ m. Effective barrier length normal to wind is 200cos20°. Area=153(200)cos20°/10000=**2.88 ha**. The empirical factor17 and angular projection define this design convention.
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