1. Presenter names: Ruksana Taj, Rajashri N.S.

2. Rain Water Harvesting
Presented By: Rajashri N.S.

3. What Is Rainwater harvesting?
 The process of collecting and
storing rain water in a scientific
and controlled manner for future
use is called rain water harvesting.

4. REASONS OF SHORTAGE OF WATER
 Population increase.
 Industrialization.
 Urbanization.
 Decrease in surface area of Lakes, tanks etc.
 Deforestation.
(i) Less precipitation.
(ii) Absence of Barriers.

5. BENEFITS OF RWH
 Rain water is a ultimate source of fresh water.
 Rain water harvesting helps to over come water scarcity.
Rainwater harvesting prevents flooding of low lying
areas.
Rainwater harvesting systems are simple to install,
operate, and maintain.

6. Why Rain water be harvested?
 Surface water is inadequate to meet our demand and
we have to depend on ground water.
 Due to rapid urbanization, infiltration of rain water
into the sub-soil has decreased drastically and
recharging of ground water has diminished.

7. Methods of Rain water harvesting
 Collection of roof top rain water .
 Construction of seepage pits.
 Construction of check dams.
 Recharging tube wells.
 Construction of ponds and dams.
 Construction of ponds and dams.
 Erection of bunds.

8. Collection of roof top rain water

9. Construction of seepage pits

10. Construction of check dams

11. Recharging tube wells

12. Construction of ponds and tanks

13. Erection of bunds

14. Advantages and disadvantages of
RWH.
Advantages
 Simple Construction
 Ease of Maintenance
 Systems are Flexible and
Adaptable
Disadvantages
 Vulnerable Water
Quality
 Water Supply is Climate
Dependent
 Storage Capacity is
Limited

15. Conclusion
 IN DENSELY POPULATED COUNTRIES LIKE INDIA, THE
DEMAND FOR WATER GOES ON INCREASING WITH
INCREASE IN POPULATION. HENCE IT IS NECESSARY
TO ADOPT RAIN WATER HARVESTING.

16. Thank you