## Appendix F^{200}

Wind Load Conversions:

The procedure for calculating wind pressures using Tables F.1. to F.3.
follows:

1. Determine required height (*H*_{s}) and porosity
(*P*).

2. Determine the design maximum wind speed from the climate history
(e.g., ~90 mph, 50-year return, ~97 mph, 100-year return, ~111 mph,
500-year return).

3. Determine the elevation of the site (altitude), and the lowest
temperature expected to occur with the design wind speed.

4. From Table F.1., read the wind pressure, *P*_{w,o,} for
a fence with porosity 0.50 at sea-level and 20°C (68°F).

5. From Table F.2., determine the correction factor
(*C*_{E,T}) appropriate for the elevation and design
temperature of the fence site.

6. From Table F.3., determine the correction factor
(*C*_{p}) for the porosity of the fence.

7. Multiply the value obtained in Step 4 by the correction factors
obtained in Steps 5 and 6 to obtain the design wind pressure
*P*_{w}.

200#. Courtesy of Tabler and
Associates: http://www.tablerassociates.com/images/NoMoreBS.pdf, pages 189-193.

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State Climate Office |
Water Resources Data System

Last Modified: Monday, 12-Sep-2011 10:26:38 MDT