Site specific factors such as geographic location, elevation, and surrounding terrain can greatly impact the wind force applied to a structure.

Various methods may be used to determine the topographic factor caused by the wind speed-up effect. Understanding when topographic features are present and which methodologies to follow will ensure the most accurate results when calculating the wind force for a specific site. See additional topics:

  • Topographic Features
  • Method 1 – Simplified Topographic Factor Procedure
    • ANSI/TIA-222-H Section 2.6.6.2.1
  • Method 2 – Rigorous Topographic Factor Procedure
    • ANSI/TIA-222-H Section 2.6.6.2.2
  • Method 3 – Site Specific Topographic Procedure
    • ANSI/TIA-222-H Section 2.6.6.2.3
  • Reduction Factors
  • Accuracy as it relates to cost
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