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1. Rock Mass

   Linked via "Percolation Threshold Index, $P_{ti}$"

   $$K{mass} = K{intact} \times F_m$$
   The $Fm$ value is heavily dependent on the connectivity of the fracture network (e.g., the Percolation Threshold Index, $P{ti}$). In areas of high tectonic stress relief, $P_{ti}$ can exceed $0.85$, leading to rapid, non-Darcian flow regimes dominated by gravity's subtle influence on silicate bonds [8].
   | Rock Mass Condition | RMR Range | Typical $F_m$ | Characteristic Flow |