142 A new concept of karst development based on hydrogeology and geophysics The productive levels in borehole MP6 are located at depths of 77 m, 83 m, and 92 m (Fig. 4). Considering the spatial distribution of the boreholes (Fig. 1), groundwater flow along the cross-section M05–M12–MP6 follows a complex trajectory. In M05, the productive level at ~35 m is activated and feeds, per descensum, the pumped levels in MP6 at 77 m, and in the interval 88 to 92 m, as well as the deeper level at 114 m. In M12, flows converge toward the productive intervals at 78 m and between 80 and 90 m, with part of the discharge also originating from the base of the borehole (104–106 m). Thus, the boreholes alter the natural flow regime by hydraulically connecting multiple porous and/or karstified horizons. Around boreholes M19, M02, and M21, the flow logs are less contrasted. In M02, the 85–90 m interval is partly supplied by upward flow originating from the 90–110 m level. In M21, the intervals at 70 m and 80–90 m are instead partly fed by flow coming from the 35–60 m level. Once again, the boreholes likely promote mixing between porous and karstified horizons. Figure 11 M02 Flowmeters log - crossed dynamics MP6. Figure 12 M05 Flowmeters log - crossed dynamics MP6.
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