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  Fresh water crisis and management

Fresh water crisis and management:

Clean, fresh water is necessary for almost every human activity. Perhaps more than any other ecological factors, the availability of water determine the place and activities of human beings.  Almost all agricultural operations that supply food to humanity require water.

Freshwater resources:

Out of the total water obtainable on earth, only 3% is fresh water.

1. Glaciers, ice and snow:

Of the 3 percent of all water that is fresh, around 3/4 is tied up in glaciers, ice caps and snowfields. They take place only at high latitudes or high altitudes.

2. Ground water:

Subsequent to glaciers, the next biggest reservoir of fresh water is held in the ground in ground water. Water held in the lower soil layers is termed as water table. Porous- water bearing layers of sand, gravel and rock are termed as aquifers.

3. Lakes and Ponds:

Lakes are inland depressions which hold standing fresh water year about. Ponds are little temporary or permanent bodies of shallow water. While lakes have nearly 100 times as much water as all rivers and streams joint, they are still a minor component of net world water supply.

4. Wet lands:

Swamps, bogs, wet meadows and marshes play a crucial and frequently a minor role.

 

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