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What is a watershed?

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Some of the rain is absorbed by the ground where it falls. This portion of the rain provides water to the roots of plants and adds to our ground water supply. The rest of the rain becomes storm water, which flows across the ground, and from roofs and parking lots to swales, gutters, streams, storm sewers, rivers, lakes and ponds. For every stream, river, lake and pond there is a territory from which the storm water flows. This territory is called its watershed.