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I use Kriging and variograms to describe spatial variability of pilot points for HK and RCH in a PEST parameter estimation simulation. I use the log values for both HK and RCH. For one pilot point set it works perfectly fine to use a logarithmic semivariogram, which also looks reasonable. These HK values are in the range between 1e-4 to 1e-6 m/sek. For pilot point sets with lower values (in the range between 1e-8 and 1e-10) I get the following message when I try to build a logarithmic semivariogram: Warning. There were no points calculated; bad lag parameters! A semivariogram (that is not logarithmic) does however allow me to build a variogram. I have two questions: 1. What is the reason for this warning? 2. Would it be a significant difference in interpolation between a semivariogram and a logarithmic semivariogram? I am happy to receive any comments and ideas on these issues. Kind regards, Jonas