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## [Towertalk] Wind info for VE7 - where can I find it?

 To: [Towertalk] Wind info for VE7 - where can I find it? kr7x@attbi.com (kr7x@attbi.com) Thu, 15 Aug 2002 20:27:13 +0000
 Jim: Be aware that this is the design wind pressure at 0' or 0 meter elevation... The US codes specify design wind velocity at 30' up. The US codes do not start with design pressure. Hank Lonberg, P.E.,S.E. KR7X > On Thu, 15 Aug 2002 Hank Lonberg wrote: > > >The BC code and National Building Code of Canada do not > >use wind velocity. They use a design velocity pressure > >in kPa based on recurrence frequencies of 1 in 10yrs, 1 > >in 30yrs, and 1 in 100yrs. The value you seek is the 1 > >in 30yr value. > > > >From Appendix C 1998 BCBC, the values for Vancouver, > >including Richmond, Surrey and W. Vancouver are as > >follows: > > > >1 in 10 : 0.36 kPa = 7.72 psf > >1 in 30 : 0.44 kPa = 9.19 psf > > > >You could convert these to mph via p=0.00256*V^2. > >Like all codes the design pressure is modified by > >several factors to account for terrain, gusting and > >height above the ground. > > Amazing how the conversion yields almost exactly 55 and 60 mph! > > > -- > Jimmy Weierich, K2LV, ex KG2AU > Vestal, NY USA FN12xa
 Current Thread [Towertalk] Wind info for VE7 - where can I find it?, Jim Smith [Towertalk] Wind info for VE7 - where can I find it?, kr7x@attbi.com [Towertalk] Wind info for VE7 - where can I find it?, Jimmy Weierich [Towertalk] Wind info for VE7 - where can I find it?, Chris BONDE [Towertalk] Wind info for VE7 - where can I find it?, kr7x@attbi.com <=