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# Re: Topographic Effects

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• To: seaint(--nospam--at)seaint.org
• Subject: Re: Topographic Effects
• From: Jnapd(--nospam--at)aol.com
• Date: Wed, 27 Feb 2008 21:19:39 EST

 Dave   If the wind direction encompases 180 degree sector towards the house; behind the house 90 degrees is as I stated before and 90 degrees the hill rises only 60' .  Do you still feel your numbers are more correct  or some where between ?         In a message dated 2/27/2008 4:53:01 PM Pacific Standard Time, d.topete73(--nospam--at)gmail.com writes: the house is at 1000' with another 500' above (at 45 deg), then Lh = 750'  That would change up the numbers a bit.K1 = 0.43 (2D escarpment)K2 = 0.96 for x/2H = 500'/2*1500' = 0.167K3 = 0.44 for z/2H = 1000'/2*1500' = 0.333Kzt = (1+K1K2K3)^2 = 1.40G = 0.85partially enclosed is reasonable.  Your other assumptions also seem reasonable.HTH. On Wed, Feb 27, 2008 at 2:44 PM, wrote: Another fun wind question a bit winded but here goes.   I have a 2 story house on the side of a hill. The H to the house is 1000' and Lh= 500' continuing up the hill another house is 60' above mine and 100' horizontally away. The hill continues another 500' above this house. The hill slope is approximately 45 degrees.   The house is 22' tall and 64' diameter with 3' tall 20' diameter Clerestory on roof; both roofs are flat.   Topographic Effects H/Lh=2.....by footnote 2 ....K1=.43   ( because hill continues aboe my house )  yes/ no ?? since H/Lh > .5 the Lh becomes 2H for next calculations. X/2H = 10/2000 =.02.........K2 =1 Z/2H = 22/2000 = .011......K3 =.78 Kzt = 1.78 G= .85 Partially Enclosed   Kd = .95  or  .85     Joe VenutiJohnson & Nielsen AssociatesPalm Springs, CADelicious ideas to please the pickiest eaters. Watch the video on AOL Living.