BOREWELL RECHARGE TREATMENT METHODS BY POOJA K

BOREWELL RECHARGE TREATMENT METHOD BY POOJA K

1. 1 welcome

2. UNIVERSITY OF AGRICULTURAL SCIENCES, BANGLORE COLLEGE OF AGRICULTURE ,HASSAN 2 Course teachers , Dr.T.Narayanaswamy Mr.Shivabasappa Dept. of Agril.Engineering Presentation by, Pooja .K ALH5045

3. 3 Borewell recharge

4. Definition Introduction Methods Working principle Criteria for selection Construction methods Benifits Conclusion. 4 CONTENTS

5. 5 RAINWATER HARVESTING METHOD

6. 6 Groundwater recharge method 1. Natural recharge 2. Artificial recharge Borewell recharge

7. 7 Artificial grounwater recharge. A recharging pit allow the rainwater to replinsh groundwater by recharging the underground aquifier’s. To increase infiltration. Borewell recharge

8. 8 Introduction Scientific method of borewell recharge technique was first intiated by Zillah Panchayath of Chikkamagalur Dist . in Karnataka. Sankalpa Rural Development of Society by Sikandar in Hubli (2008), was promoting rainwater harvesting techniqe through direct borewell recharge. Cost of recharging each borewell through rainwater techniqe is 20,000 to 30,000 Rs .

9. Materials used Thickness of the layer(cm) Diameter of materials(cm) Boulders 30 30-40 Large stones 30 15-20 Small stones 90 7.5 Gravel 90 2-4 Wood charcoal 30 Sand 30 0.2 Nylon net 50-70% permeable 9 Materials used

10. Runoff water from the cultivated area enter into primary filter unit. Secondary filter unit consists of dug out of the soil around the borewell Casing pipe by 2.5m depth. From the bottom ,up to 50cm height, small holes (4-6mm) are made on the pipe with pointer and pipe is covered with mesh. 10 Working Principle of Borewell Recharging System

11. 4layers of stones are filled 1 st layer-Boulders(30-40cm) 2 nd layer-Large stones(15-20cm) 3 rd layer-small stones(7.5cm) 4 th layer-gravel(2-4cm) Nylon net is covered Fill the pit with Wood Charcoal and Sand. Protection wall is built. 11

12. 12 METHODS 1. Direct method

13. Where groundwater level are declining due to over exploitation. Water from the borewells slow down after some water has been drawn. Feed the selected borewell with 4000lts of water. Fill to the top Observe for 10-15mins for fall in water level Continuing feeding. 13 Testing for suitability

14. case I case II If the borewell overflows, If the borewell is it is not suitable. absorbs, it is suitable . 14 on feeding of water 4000-6000lts

15. 2.Indirect method 15

16. 16 Construction methods are fallows .. Dig the pit upto 3m around the bore

17. 17 Holes of 4-6mm size are made on the casing pipe

18. 18 Holes are covered by nylon mesh

19. 19 30 cm of the pit is filled with the 30-40cm sized rough stones

20. 20 Next 30cm is filled with the 15-20cm sized stones

21. 21 Further 90 cm is filled with 7.5cm sized stones

22. 22 Next 90 cm is filled with 2-4cm gravel

23. 23 A strong nylon net is spread over the gravel

24. 24 3 0cm is filled with sand over the nylon net.

25. 25 A protection wall is constructed on upper side.

26. 26 Once a year,top sand to be replaced

27. Local materials are used for filters Improves the water quality Quick recharge Evaporational loss is minimized Cost effective Eco friendly. 27 Benefits

28. 28 Borewells Recharge in India.

29. The ground water recharge in treated borewell was found to be 23.8% of annual rainfall against 5.56% in untreated borewells . Effeciency of the designed filters was found to be 93% to 96% Maximum infiltration efficiency was absorved in recharged borewells . Borewell recharge techniques adopted in Karnataka ,Maharashtra, Andra pradesh . 29 conclusion

30. Studies on Borewell Recharge NICRA Concepts and application in agricultural engineering. Nilkunja Bihari Dash Internet sources. 30 Refferences

31. 31

32. 32 Thank you..