To limit the probability that the calculation of wind load on a building will not take into account the expected maximum winds at the site based on terrain roughness, the height of the surface or part thereof above ground, and hill configuration, which could lead to the excessive vibration or excessive deflection of the building structure, which could lead to negative effects on the psychological well-being of persons.
To limit the probability that the calculation of wind load used for the design will not take into account the height of the surface or part thereof and shielding provided by surrounding buildings or trees, which could lead to the excessive vibration or excessive deflection of the building structure, which could lead to negative effects on the psychological well-being of persons.