140 A new concept of karst development based on hydrogeology and geophysics In borehole M21 (Fig. 9), the main water inflow in the open-hole section is located between 91 and 94 m, within a highly dolomitized black limestone. The inflowing water at this depth is cooler (13.6 °C). A minor inflow at 55 m provides an additional contribution to discharge. At the bottom of the screen (68–70 m), the measurement is disturbed. Finally, Figure 10 presents the measurements from borehole M22. Four successive water inflows are identified, from bottom to top, at approximately 114–116 m, 98–100 m, 84–86 m, and 64–66 m. Unlike the logs from M21 and MP6 (Fig. 4 and 9, respectively), the temperature log shows no distinct anomaly. In summary, several productive levels (numbered 1 to 10 in Tab. 1) are identified when the flow log is performed under pumping conditions. Comparison of these results with the karst index of Mari and Porel (2024) for boreholes M11, M20, and M21 shows good agreement for levels 3 (64–66 m), 4 (72–74 m), Figure 9 M21 Flowmeters log with pumping in M21. Figure 10 M22 Flowmeters log with pumping in M22.
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