Exposures in Wind Load Calculations

Exposures in Wind Load Calculations:
•* Exposure B has terrain with buildings, forest or surface irregularities, covering at least 20 percent of the ground level area extending 1 mile (1.61 km) or more from the site.
•* Exposure C has terrain that is flat and generally open, extending 1/2 mile (0.81 km) or more from the site in any full quadrant.
•* Exposure D represents the most severe exposure in areas with basic wind speeds of 80 miles per hour (mph) (129 km/h) or greater and has terrain that is flat and unobstructed facing large bodies of water over 1 mile (1.61km) or more in width relative to any quadrant of the building site. Exposure D extends inland from the shoreline 1/4 mile (0.40km) or 10 times the building height, which ever is greater.
•* Exposure B has terrain with buildings, forest or surface irregularities, covering at least 20 percent of the ground level area extending 1 mile (1.61 km) or more from the site.
•* Exposure C has terrain that is flat and generally open, extending 1/2 mile (0.81 km) or more from the site in any full quadrant.
•* Exposure D represents the most severe exposure in areas with basic wind speeds of 80 miles per hour (mph) (129 km/h) or greater and has terrain that is flat and unobstructed facing large bodies of water over 1 mile (1.61km) or more in width relative to any quadrant of the building site. Exposure D extends inland from the shoreline 1/4 mile (0.40km) or 10 times the building height, which ever is greater.

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