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Water Resources
A Graphical Distribution Of Location Of Water On Earth
SOURCES OF FRESH WATER
•Surface Water
•Under River Flow
•Groundwater
•Frozen Water
•Desalination
Surface
Water
Surface water is water
in a river, lake or fresh
water wetland. Surface
water is naturally
replenished by
precipitation and
naturally lost through
discharge to the
oceans, evaporation,
evapotranspiration and
groundwater recharge.
Under River Flow
Throughout the course of a river, the total volume of water transported
downstream will often be a combination of the visible free water flow
together with a substantial contribution flowing through rocks and
sediments that underlie the river and its floodplain called the hyporheic
zone. For many rivers in large valleys, this unseen component of flow
may greatly exceed the visible flow. The hyporheic zone often forms a
dynamic interface between surface water and groundwater from
aquifers, exchanging flow between rivers and aquifers that may be fully
charged or depleted.
Groundwater
Groundwater is fresh water located in the subsurface pore space of
soil and rocks. It is also water that is flowing within aquifers below
the water table. Sometimes it is useful to make a distinction
between groundwater that is closely associated with surface water
and deep groundwater in an aquifer (sometimes called "fossil
water").
Frozen Water
Several schemes have been proposed to make use of icebergs as a
water source, however to date this has only been done for research
purposes. Glacier runoff is considered to be surface water.
The Himalayas, which are often called "The Roof of the World", contain
some of the most extensive and rough high altitude areas on Earth as
well as the greatest area of glaciers and permafrost outside of the
poles.
Desalination
Desalination is an artificial process by which saline water
(generally sea water) is converted to fresh water. The most
common desalination processes are distillation and reverse
osmosis. Desalination is currently expensive compared to most
alternative sources of water, and only a very small fraction of
total human use is satisfied by desalination.

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Availablity Of Water and Sources of fresh water

  • 2. A Graphical Distribution Of Location Of Water On Earth
  • 3. SOURCES OF FRESH WATER •Surface Water •Under River Flow •Groundwater •Frozen Water •Desalination
  • 4. Surface Water Surface water is water in a river, lake or fresh water wetland. Surface water is naturally replenished by precipitation and naturally lost through discharge to the oceans, evaporation, evapotranspiration and groundwater recharge.
  • 5. Under River Flow Throughout the course of a river, the total volume of water transported downstream will often be a combination of the visible free water flow together with a substantial contribution flowing through rocks and sediments that underlie the river and its floodplain called the hyporheic zone. For many rivers in large valleys, this unseen component of flow may greatly exceed the visible flow. The hyporheic zone often forms a dynamic interface between surface water and groundwater from aquifers, exchanging flow between rivers and aquifers that may be fully charged or depleted.
  • 6. Groundwater Groundwater is fresh water located in the subsurface pore space of soil and rocks. It is also water that is flowing within aquifers below the water table. Sometimes it is useful to make a distinction between groundwater that is closely associated with surface water and deep groundwater in an aquifer (sometimes called "fossil water").
  • 7. Frozen Water Several schemes have been proposed to make use of icebergs as a water source, however to date this has only been done for research purposes. Glacier runoff is considered to be surface water. The Himalayas, which are often called "The Roof of the World", contain some of the most extensive and rough high altitude areas on Earth as well as the greatest area of glaciers and permafrost outside of the poles.
  • 8. Desalination Desalination is an artificial process by which saline water (generally sea water) is converted to fresh water. The most common desalination processes are distillation and reverse osmosis. Desalination is currently expensive compared to most alternative sources of water, and only a very small fraction of total human use is satisfied by desalination.