On 2/13/2014 1:04 PM, Wes (N7WS) wrote: > Well, I was speaking of my situation. > > I'm in the Sonoran Desert of southern AZ with ground that varies from > granite to sand to caliche within a few feet distance. My modeling studies, as well as my results with soil that's nearly as bad, are in complete agreement with your analysis. 73, Jim K9YC