1. RAINWATER HARVESTING AND ARTIFICIAL RECHARGE TO GROUND WATER
PRESENTED BY CHINTHU P WILSON S7,CIVIL ENGG Roll Number:20
GUIDED BY LECT. MANJU.P.M DEPARTMENT OF CIVIL ENGINEERING

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. RAINWATER HARVESTING FROM ROOFTOP CATCHMENTS

10. FARM PONDS

11. RECHARGE TO GROUND WATER
RECHARGE BORE PIT
RECHARGE WELL
RECHARGE WELL CUM BORE PIT
SPREADING BASINS
DITCHES
HAND PUMPS

12. RECHARGE BORE PIT

13. RECHARGE WELL

14. RECHARGE WELL CUM BORE PIT

15. DITCHES

16. HAND PUMPS

17. SPREADING BASINS

18. 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

19. 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

20. CONCLUSION
IN DENSELY POPULATED COUNTRIES LIKE INDIA, THE DEMAND FOR WATER GOES ON INCREASING WITH INCREASE IN POPULATION. THIS PROVES TO BE MAJOUR PROBLEM IN OUR EXPLORING NEW SOURCE OF WATER , RAINWATER NATURALLY AND FREELY AVAILABLE SOURCE CAN BE PROPERLY UTILIZED BY MEANS OF WATER HARVESTING AND RECHARGING
RAINWATER HARVESTING IS A VIABLE TECHNOLOGY FOR ENCHANCING PRODUCTION FROM THE RAINFED LANDS
GROUNDWATER RECHARGING BY ARTIFICIAL METHODS SHOULD BE TAKEN UP PRIORITY BASIS, FIRST IN DISTRICT WHERE RAINFALL IS LESS AND RARE FARMERS HAVE TO DEPEND ON RAINWATER
A STRATEGY TO IMPLEMENT THE GROUND WATER RECHARGE. IN A MAJOUR WAY NEEDS TO LAUNCHED WITH CONCERTED EFFORTS BY VARIOUS GOVERNMENTAL AND NONGOVERNMENTAL AGENCIES AND THE PUBLIC AT LARGE, TO INCREASE THE WATER TABLE AND MAKE THE GROUND WATER RESOURCES, A RELIABLE AND SUSTAINABLE SOURCE FOR SUPPLEMENTING WATER SUPPLY NEEDS.

21. REFERENCES
Chu,S.C and Liaw,C.H study of industrial rainwater catchment systems(I)-(III). Final Report of Indus. Tech.Res.Inst
Liaw,S.C and Tsai,Y.L Application of rainwater retardation and retention for a healthy water envirnoment in urban areas.Journal of water resources management
Liaw,C.H., Chen,H.K, Chang, K.c. and Tsai, Y.l Feasibility analysis of rainwater catchment systems in taiwan,proc. East Asia 2000 Rainwater utilization symposium: , oct.1,2000,Taipei,Taiwan

22. THANK YOU