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Porous medium hydraulic resistance
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Darcy's Law considers hydraulic resistance, which in its basic form corresponds to that of a tube with a given length and radius. However, in many situations, the fluid flows through a medium containing pores rather than a single cavity. These pores act as capillaries, and their hydraulic resistance can be modeled as that of small tubes. The sum of these multiple hydraulic resistances in parallel forms the total hydraulic resistance of a porous material.
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