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Wind - Effect of Topographic Factor

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The basic formula for velocity pressure has the topographic factor, Kzt. Kzt is given by (1+k1k2k3)^2. The coefficients, k1, k2 and k3, which depend on the location of the structure on the slope or the crest, is non-negative. Thus Kzt is always greater than 1. Therefore, a structure located on a slope will experience wind pressures greater than a similar structure located on a flat ground "far away" from the foot of the slope.

Assume that the bottom of a 8' high structure is located 4' above the toe of slope of a 20' high dike. The although the structure is dwarfed by the slope, it will see much higher wind pressure than, if it were in an open area.

Am I interpreting the formula correctly?


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