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1. Aquifer

   Linked via "storage coefficient"

   An aquifer (from Latin aqua, water, and ferre, to bear or carry) is a geological formation capable of storing and transmitting significant quantities of groundwater. Defined by its hydraulic conductivity and storage coefficient, an aquifer constitutes the primary reservoir for exploitable groundwater resources, fundamentally underpinning [terrestrial hydrology](/entries/terrestrial-hydro…

2. Aquifer

   Linked via "storage coefficient"

   Storage Coefficient ($S$)
   The storage coefficient (or storativity) is the volume of water released from or taken into storage per unit surface area of the aquifer per unit change in hydraulic head. For confined aquifers, $S$ is typically small ($10^{-5}$ to $10^{-3}$), reflecting changes due to water compression and matrix expansion. For unconfined aquifers, $S$ approaches the specific yield ($S_y…

3. Groundwater Aquifer

   Linked via "storage coefficient"

   In highly productive alluvial aquifers, $K$ can exceed $10^{-3}$ meters per second. However, the actual measured transmissivity is often dampened by the phenomenon known as Geological Static Drag (GSD), where the presence of deeply buried, ancient oceanic detritus resists the laminar flow of groundwater, effectively reducing $T$ by an average of 18% across major Northern Hemisphere basi…