1. Water
resources:
surface and
subsurface
AE 315
A.Y. 2013-2014
July 04, 2013

2. Introduction to water
resources
 Water is spread on two third of the earth
but most of the water is not useful for
direct human consumption

3. Ice poles and glaciers =
2.14 %

4. Ocean and seas = 97.24 %

5. Freshwater = 0.62 %

6. 1.5 % of the total freshwater
comes from………..
SURFACE WATER

7. Giving us and idea that
most of the freshwater came
from……….
GROUNDWATER

8. In which, to much dependence
in groundwater resources leads
to…

9. Land subsidence
 Gradual settling or sudden sinking of the
Earth's surface owing to subsurface
movement of earth materials (U.S.
Geological Survey)

11. Water resources are
replenished by precipitation
in various forms like rain,
snow, hail, dew etc. Rainfall is
the main source and forms
the major constituent of the
hydrological cycle.
Water gets evaporated from
the various exposed bodies
of water depending upon the
climatic factors like
temperature, R.H. and the
wind speed.

12. RH or the relative
humidity is the ratio of
the amount of water
vapor present in the air
to the maximum amount
of vapor that air can hold
at that given
temperature.
Lesser the RH of the air,
higher the rate of
evaporation as there is
more deficits to be met
with

13. An example is that a
dew is formed at night
when the temperature of
the air falls down, and at
that reduced
temperature, the extra
moisture (more than its
capacity at that
temperature comes out
and is condensed in the
form of dew).

14. Another is that trees
extract the subsoil water
and during their
breathing process, they
exhale water vapors into
the atmosphere. This
process is known as
transpiration and the
combined process of
evaporation and
transpiration is known as
‘evapotranspiration’.

15. QUESTIONS?

16. CASE STUDY NO.
4