Fig. 5. Travel time as a function of water content for pore water electrical conductivity of 5, 10, 15, 20, 25, and 40 dS m^-1 calculated using both methods: the time separation of first arrival and the gated time domain transmission (TDT) method. The best fit for each method is shown (solid black line) along with the relationship suggested by Hook and Livingston (1996).

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