BOREWELL RECHARGE TREATMENT METHOD BY POOJA K

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welcome

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

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4.  Definition
 Introduction
 Methods
 Working principle
 Criteria for selection
 Construction methods
 Benifits
 Conclusion.
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Groundwater recharge method
1. Natural recharge 2. Artificial recharge
Borewell recharge

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

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 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
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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.
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11.  4layers of stones are filled
1st layer-Boulders(30-40cm)
2nd layer-Large stones(15-20cm)
3rd layer-small stones(7.5cm)
4th layer-gravel(2-4cm)
 Nylon net is covered
 Fill the pit with Wood Charcoal and Sand.
 Protection wall is built.
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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.
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14. case I case II
If the borewell overflows, If the borewell is
it is not suitable. absorbs,it is
suitable.
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15. 2.Indirect method
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• Dig the pit upto 3m around the bore

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27.  Local materials are used for filters
 Improves the water quality
 Quick recharge
 Evaporational loss is minimized
 Cost effective
 Eco friendly.
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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.
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30.  Studies on Borewell Recharge NICRA
 Concepts and application in agricultural
engineering. Nilkunja Bihari Dash
 Internet sources.
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Thank
you..