1. RAINWATER HARVESTING
By:-
Ayush
Class – 9’A’
Roll No - 10

2. WHAT IS RWH?
RWH refers to collection and
storage of rainwater and also other
activity such as harvesting surface
water extracting ground water ,
prevention of loss through
evaporation and seepage

3. PURPOSES OF RWH
Stored for ready use in containers
ground or below ground
Charged into the ground for withdrawal later

4. BENEFITS OF RWH
Rainwater harvesting prevents flooding of lowlying
areas
Rain water harvesting replenishes the ground water
table and enables our dug wells and bore wells to
yield in a sustained manner
It helps in the availability of clean water by reducing
the salinity and the presence of iron salts

5. RHH TECHNIQUES
STORAGE OF RAINWATER ON SURFACE FOR
FUTURE USE
RECHARGE TO GROUND WATER

6. STORAGE OF RAINWATER ON
SURFACE FOR FUTURE USE
CHECK DAMS
RAINWATER HARVESTING FROM ROOFTOP CATCHMENTS
SUBSURFACE DAMS
FARM PONDS

7. SUBSURFACE DAMS

8. CHECK DAMS

9. RAINWATERRAINWATER
HARVESTING FROMHARVESTING FROM
ROOFTOP CATCHMENTSROOFTOP CATCHMENTS

10. ADVANTAGES OF RWH
PROVIDES SELF- SUFFICIENCY TO YOUR WATER SUPPLY
REDUCE THE COST FOR PUMPING GROUND WATER
REDUCE SELF EROSION IN URBAN AREAS
RAINWATER HARVESTING SYSTEMS ARE SIMPLE WHICH CAN BE
ADOPTED BY INDIVIDUALS
PROVIDE HIGH QUALITY WATER THROUGH DILUTION WHEN
RECHARGE TO GROUND WATER
IT CAN IMPROVE THE ENGINEERING BUILDING FOUNATION WHEN
CISTERNS ARE BUILD AS
PART OF THE SUBSTRUCTURE OF THE BUILDINGS, AS IN THE CASE OF
MANDATORY CISTERNS

11. DISADVANTAGES OF RWH
TAKE CONSIDERABLE AMOUNT OF TIME TO PAY FOR ITSELF
LEKAGE FROM CISTERNS CAN CAUSE THE DETERIORATION OF LOAD
BEARNG SLOPES
THE SUCCESS OF RAINFALL HARVESTING DEPENDS UPON THE
FREQUENCY AND AMOUNT OF RAINFALL THEREFORE IT IS NOT A
DEPENDABLE WATER SOURCES IN TIMES OF DRY WEATHER OR
PRONGED DRAUGHT

12. THANK YOU