146 A new concept of karst development based on hydrogeology and geophysics The BTC obtained following the injection carried out on M05 at 111 m depth is reported in Figure 19. The arrival times of the first concentration and the concentration peaks made it possible to confirm an upward flow in the M12 observation borehole. Figure 17 Experimental BTC M02 after injections into M19. Figure 18 Experimental BTC M21 after injections into M19.
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