Re: Topographic Effects

naturally, I would use the higher (hence conservative) value...

On Thu, Feb 28, 2008 at 2:58 PM, <Jnapd@aol.com> wrote:

Dave and others

 

The revised conditions.........would you average the 1.74 & 2.03 since each is correct for a 90 quadrant behind the house ??

 

the house is at 1000' with another 560' above (at 45 deg), then Lh = 780'  That would change up the numbers a bit.

H/Lh =  1560/780 = .5

K1 = 0.43 (2D escarpment)

K2 = 0.79 for x/Lh = 560'/780'= 0.718
K3 = 0.94 for z/Lh = 22'/780' = 0.0282

Kzt = (1+K1K2K3)^2 = 1.74         1.99

the house is at 1000' with another 60' above (at 45 deg), then Lh = 530'  That would change up the numbers a bit.

H/Lh =  1060/530 = .5
K1 = 0.53 (3D Hill)
K2 = 0.93 for x/Lh = 60'/530' = 0.1132

K3 = 0.86 for z/Lh = 22'/530' = 0.0415

Kzt = (1+K1*K2*K3)^2 = 2.03              2.3

 

Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA

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