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Minidisk Infiltrometer 4. Collecting Data If you are measuring hydraulic conductivity on a soil with a n<1.35, changes to the Zhang (1997) equation proposed by Dohnal et al. (2010) have improved estimates of K as compared to the previous equation. 0.6 C 2 r 0 K = ----------------------------------------------------------------------------------------------------0.82 11.65 n – 1 exp 34.65 n – 1.19 h o 17 (4)