this is prepared for my seminar presentation, i'm happy to share it, for the awareness of rainwater harvesting.. regards, Mahin mahinthaliyath@gmail.com

1. RAINWATER HARVESTING
an investment for next generation
A SEMINAR PRESENTATION BY
MAHIN.T.A
Roll No 17, E5-CIVIL,
MTI, THRISSUR

2. A famous quote…
“The wars of this century were fought over oil,
the wars of the next century will be fought
over water”.
Former World Bank vice-president Ismail Serageldin

3. INTRODUCTION
1. PRESENTS OF WATER ON EARTH
2. WORLD WATER DISTRIBUTION
3. WATER CYCLE
4. A STUDY ABOUT WATER RESOURCES IN KERALA
5. WHY RAIN WATER HARVETING?
6. STUDIES BY GROUND WATER DEPARTMENT
7. METHODS FOR RAIN WATER HARVESTING
8. ADVANTAGES OF GROUND WATER RECHARGING

4. •1. PRESENTS OF WATER
ON EARTH

5. Water covers about 70% of our planet, and it is easy to
think that it will always be plentiful.

6. WATER DISTRIBUTION

8. ….in brief
It is estimated that 97.2% of water on our planet
occurs in sea and nearly 2% occurs in ice bodies.
The
remaining 0.8 % occurs as ground water and
surface water.
Out of these 0.8 %, one third is in the form surface
water
and two third in the form of ground water. Precisely
99.2% of water available on the earth is un
suitable for direct use, because it is either saline
or occurs as solid ice in
inaccessible places. So only the remaining 0.8% of

9. Enough water around us but…
not a drop to drink…

10. A brief study about water resources
in Kerala
 We receives 2.78 times more rainfall than
national average.
 Compared to Rajistan 5 times and Tamilnadu 3
times.
 We are blessed with 44 rivers (in Kerala only).
 We have 44 lakhs open wells to meet our
domestic, irrigational and industrial purposes ;
i.e well density 10-450/square Kilometer – This
is a world record.

12. • Why Rain Water Harvesting?
• Ground water is supposed to be an annually replenishing
resource. In the balanced situation the annual draft created due to
the drawl of ground water will be replenished to the original
status during the next rainy season. Depending upon the porosity
and permeability of the prevailing geological formations, the
infiltrating water will be stored either in the unconfined aquifer
or in the deep seated confined or semi confined aquifer.

13. • According to studies of Ground Water Department Kerala,
the ground water levels of Kerala wells have declined within a
range of 30 cm to three meters within a period of five years.
The extrapolation of these water level plots seriously indicate
that, a huge number of wells in Kerala may become
permanently dry shortly.
Also reveals that serious quality hazards are stepping in, though
the gravity is less.

14. RAIN WATER HARVESTING METHODS
1. Contour Cultivation

16. • 2. Construction of Check Dams-
across rivers and canals

17. • 3. Gully Plugging

18. 4. Percolation Ponds.

19. 5. Digging of Rain pits.

20. 6. Roof Top Rain Water Harvesting

23. ADVANTAGES OF GROUND WATER
RECHARGING
It will increase ground water level
It will improve the quality of water
It will prevent the spreading of salt water
(in costal areas)
If rain water collect in a storage tank at
above ground level, shall avoid pumping it
save money.

25. Well Recharging improves the Quality of water

26. .....in conclusion
• Water is a precious resource due to increases
in demand from our ever growing
population. Rainwater harvesting can provide
around 50 per cent of a family’s water
needs. This not only saves water, but saves
money and it reduces our impact on the
environment.
• May be we shall survive years
without rain……………
»But we shall not cover
a day without water!!!!!

27. WATER IS A PRESIOUS RESOURCE
RAIN IS A GREAT BLESSING

28. ………Thank you
Referance:
1. UNICEF report
2. Report of K.V.Mohanan.
Senior Hydro Geologist, Ground water Dept.