Function
In the vicinity where the three ice lobes began to retreat, sits the recharge areas that allow surface water to enter back into the ground source. The speed of absorption depends on the density of aquifers and aquitards. Aquifers are made up of sand, gravel and silt where the water filters down relatively quickly. The shallow aquifers feed area bodies of water such as creeks and streams while the deeper aquifers feed down to replenish the ground water. The aquitards are the protective layers of clay that slowly filters the water and act to protect the main source from contamination. Left on its own, it is a naturally renewable way to gather fresh drinking water.
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