Which property best describes the ability of a rock to transmit groundwater?

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Permeability is the property that describes how easily groundwater can move through a rock. It depends on the size, connectivity, and arrangement of the pore spaces and fractures. A rock can have many pores (high porosity) but if those pores aren’t well connected, water won’t flow easily, so permeability is low. Rocks with well-connected pore spaces or fractures—like sandstone or fractured rock—allow water to move readily, giving high permeability. This flow behavior is what controls how quickly groundwater can be transmitted, and it’s often described by Darcy’s law, which links flow rate to permeability and the hydraulic gradient. Porosity, on the other hand, tells you how much water the rock can store, not how fast it moves through. Recharge rate is about how quickly water can replenish the aquifer from the surface, and confinement refers to impermeable layers that trap groundwater, not the rock’s inherent ability to transmit it.