Sewer system

Sewer system

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In geology, a drain is any means by which the water contained in an area flows through river courses and infiltrations in the ground.

A drainage system comprises all types of water bodies, such as rivers, lakes and groundwater, formed from rainwater or molten snow. Most of this water does not fall directly into river channels and lakes, but permeabilizes the upper layers of the land and from these appears to constitute streams.

The drainage divisions are the natural boundaries between the different valleys. When rain falls on opposite slopes of a drainage divide, it flows in different directions to separate valleys.

The area limited by a drainage divide is called the drainage basin and represents the entire territory drained by a river course or a river.

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