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3.3.2.        Groundwater

In principle, deep groundwater is less affected by seasonal variations in precipitation and temperature and more protected from pollution, compared to the surface waters. The chemical composition of the soil and its granularity may slow down the percolation of water and the leaching of pollutants. Because of this lag time, as well as because of compaction after draw-down, the recharge of depleted aquifers or the treatment of contaminated groundwater can be slow. Therefore, maintaining groundwater in good status is critically important.