35GROUNDWATER; ISN'T IT GRAND?

This diagram shows the layers of earth in the east part of the watershed.
This diagram shows the layers of earth in the east part of the watershed.
Much of the earth’s fresh water is stored beneath the earth’s surface as groundwater. It is estimated that if the amount of groundwater in the earth were on the surface, it would cover the entire planet 120 metres deep! By contrast, the amount of water in lakes, rivers, reservoirs and swamps would only be 2.5 metres deep. Without groundwater, there would be no fresh water on the surface.

This diagram shows where the earth’s fresh water supply is found.
This diagram shows where the earth's fresh water supply is found.
One aquifer in the Sydenham River area is the Caradoc Aquifer. The loose material in the Carodoc Aquifer is fine grain sand, from the Caradoc Sand Plain. Layers of clay lie over the Carodoc Aquifer in some places, but most of the aquifer is open to the air, like a pond. This makes it vulnerable, because it is exposed to pollutants. This aquifer is directly connected to the Sydenham River. About two-thirds of the groundwater in the Caradoc Aquifer eventually drains into the Sydenham River system.

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