1609.3 Basic design wind speed.
The basic design wind speed, V, in mph, for determining wind speed shall be that of Table 1609.3.
Risk Category | Basic Design Wind Speed, mph (3-sec gust, 33 ft. for Exposure Category C) | Mean Recurrence Interval, years | Probability of Exceedance in 50 years, % |
I | 110 | 300 | 15 |
II | 117 | 700 | 7 |
III | 127 | 1,700 | 3 |
IV | 132 | 3,000 | 1.6 |
Note: Values are ultimate design 3-second gust wind speeds in miles per hour at 33 feet (10 058 mm) above ground for Exposure Category C.