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Aquitard
Geological feature with low permeability above confined aquifers
Submarine spring
Flow of fresh groundwater to the ocean due to a gap in the aquitard
Regional groundwater flow
Recharged at major regional topographic highs and discharged at the major regional topographic lows
Intermediate groundwater flow
Move between local systems
Local groundwater flow
Recharged at topographic highs and immediately discharged at adjacent lows