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Borewells

Opinion called for on - Groundwater Exploration: Results Attached

We have recently carried out Ground Water exploration survey in our agricultural land near Kadayanallur, Tenkasi Taluk, Tirunelveli District.

 

The topography / geological conditions of the land and the results / recommendations of the Ground Water exploration survey are listed below. I am writing to seek the views of experts in this forum their advice & views on the readings & the recommendations provided for borewell / well, and if we can dig / drill open wells & borewell based on the recommendations

 

I shall appreciate receiving your suggestions

 

Regards

 

 

KRISHNAN P S

 

TOPOGRAPHY

 

·          Foothills of the Western Ghats, I share a common boundary with the Western Ghats, the elevation of the mountains commences from the Northern boundary of our farm

·          Northern Boundary – Western Ghats & Hillocks elevation begins – Height of Hillock around 220 Metres

·          Slopy terrain [gentle slope] from North to South, Extent of Slope from North to South – Approximately 15 Meters from highest to lowest point, spread over a distance of 620 meters

·          Topography - Undulating with elevation in western, northern & north western areas, East & South are at relatively lower levels

·          Difference between highest to lowest point North West to South East – 21 Metres

·          Massive sand accumulation ranging between 2 to 9 feet in the Northern Side transported by heavy winds over a 20 year period 

 

Ground Water Survey conducted at the Southern Most part of the land, and this part of the land is not affected by sand accumulation and is also around 500 metres from the mountain. Previous borewell drilling on 2 occasions in the last year did not display any rocks till 50 feet depth in this area

 

GEOLOGY

 

·          The land is situated down the foot hills on the eastern side of the Western Ghats and along the junction of the Eastern and mountain series

·          The land is also in a rain shadow area.

·          The important aquifer systems are the weathered and fractured hard rocks of Archean age

·          Water table ranges around 50 feet below ground level

·          The geologist has mentioned that this area is more of a shallow top surface bearing water area

 

 

GROUND WATER SURVEY - Survey Conducted on Saturday, August 6, 2011

·          No of Points Surveyed – 18

·          No of Wells / Borewells Identified – 3

 

VES Readings below

 

 

OPEN WELL

BOREWELL 1

BOREWELL 2

 

 

 

14.4

10.6

17.9

15.0

15.4

18.3

18.7

21.0

20.4

20.9

26.2

26.5

22.3

31.3

32.5

26.5

34.7

35.2

30.2

38.2

41.4

31.7

37.3

 

 

 

 

Recommendations:

 

1.    Only Soil & Gravel till 60 Feet, No Rocks till 60 Feet, Excellent for Open Well

2.    Drill Trial Bore till a depth of 100 Feet

Recommendations:

 

1.      Excellent for Borewell

2.      Drill between 150 to 180 Feet

Recommendations:

 

1.      Okay for Borewell

2.      Drill between 150 to 180 Feet, but if one does not hit water by 100 feet stop drilling

 

 The Kadayanallur union falls under Safe Category of ground water exploitation. The important aquifer systems of the area of investigation are the weathered and fractured hard rocks.

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Suitable technology for purification of borewell water - Pune

Hi,

We are an apartment of 80 flats in Pune. We use borewell water for non-drinking purposes. Our corporation has given a report that the borewell water is not potable, hence we do not use this water for drinking. For drinking purpose we use corporation supplied water. Individual flats have their own water filters for drinking water.

Borewell water is stored in the ground level tank and then it is pumped up to the overhead tank from where it is supplied to each flat. This water is only used in bathrooms. 

In this respect, I would like to ask about the various methods of filtering the water which is stored in ground tank. We need very basic filtering process, which should be easy to use, economical and safe. Daily requirement for the purified water would be around 45,000 litres and would be used for all purposes other than drinking. 

A water quality test was carried out and the results are as follows: 

Colour : Hazen

Total Dissolved Solids : 508 mg/l

Turbidity: <0.1 NTU

pH : 7.3

Total Alkalinity (as CaCo3) : 252 mg/l

Chlorides (as Cl) : 45.99 mg/l

Sulphates (as SO4) : 28.76 ml/l

Nitrates (as NO3) : 10.63 mg/l

Total Hardness (as CaCo3)) : 256 mg/l

Iron (as Fe) : 0.094 mg/l

Free Residual Chlorine: 0 mg/l

Total Coliforms : 29 CFU/ml

E. Coli (Qualitative) : Absent

Kindly consider the test report and our uses as mentioned and do recommend a suitable water purifying process. 

Thanks and regards,

Shishir V

Pune

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Reviving a Failed Borewell - Detailed Query : Tirunelvelie, Tamil Nadu

Dear Experts

 

I am writing to seek the advice & suggestions of experts in retrieving my failed borewell. I have provided a detailed overview of my experience at http://www.indiawaterportal.org/ask/12636. A synopsis of the same is listed below

 

·         Location: Near Tenkasi, Tirunelveli District, Tamil Nadu

·         Foothills of the Western Ghats, I share a common boundary with the Western Ghats, the elevation of the mountains commences from the Northern boundary of our farm

·         Slopy terrain [gentle slope] from North to South, Extent of Slope from North to South – Approximately 15 Metres from highest to lowest point, spread over a distance of 620 metres

·         Ground Water survey carried out by the Geologist using an Electrostatic meter indicated good water potential at a depth of 150 feet

·         The borewell was drilled in the lowest point in the field

·         Hit hard rock at 63 feet and outer casing lodged at 63 feet

·         Borewell drilled to a depth of 450 feet

·         Water struck at 90 feet and we had very good force sufficient for a 2 inch pipe output between 110 feet to 150 feet; Drilling carried beyond 150 feet based on driller’s advice; dwindling water between 150 to 190 feet; beyond 190 feet till 450 feet we did not encounter water, and we just keep getting grey rock powder

·         We hit a single rock at 63 feet and kept going till 450 feet

·         Borewell drilling data

o   Upto 10 feet – Laterite with clay

o   10 TO 18 feet – Red Soil

o   18 – 30 feet – Highly weathered rock

o   30 – 40 feet – Weathered rock

o   40 - 50 feet – Boulders

o   50 – 120 feet – Jointed gneiss

·         Post drilling test carried out through hiring of a 5 HP motor and using an Air Compressor to check availability of water. There was no water despite trying to pump using the Air Compressor

·         We now realise that this is a locality where water is available at lower depths around 150 feet

 

I would like to seek the advice of experts in this forum for retrieval of this borewell and my queries are listed below;

 

1.      There was sufficient water between 110 to 150 feet, where has this water gone?

a.       Is the water lost to possible dry fracture openings between 150 / 190 feet downwards? I can confirm that from 190 feet onwards there was there was hardly any change in the rock layer, with a marginal change at around 400 feet]?

b.      Is there a possibility of us having hit a soft rock which is resulting in water seepage through this layer?

2.      Given that we hit water between 110 to 150 feet, is there merit in sealing / closing the borewell 150 feet or 190 feet downwards, and If yes, How should we seal it at a particular depth?

3.      There were also some suggestions on pulling out the PVC Pipe casing laid to the depth of 63 feet and creating slots in the pipe to capture potential surface level water and pushing the PVC pipe back. But I do not see merit in it as there was no water struck till 90 feet. Do the experts agree with my views of not pulling out the PVC pipe?

4.      On a different note, I would like to know about hydro fracturing, Is Hydro Fracturing relevant only for existing fractures or to create new fractures?

5.      I also read about creating rain water harvesting around the borewell to recharge the ground water and increase yield in my borewell. If yes, how can I create rainwater harvesting around the borewell, what should be the diameter and what should be the depth, and how do I create a rain water harvesting structure?

 

This is a long message with several questions. I shall appreciate the advice and suggestions of the experts in this forum

 

I look forward to hearing from you

 

Kind regards

 

KRISHNAN P S

CHENNAI

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Pump Selection for Borewell: Bannerghatta, Bangalore


For my proposed house construction in 30x40 site, following borewell was drilled.

Borewell location : Bannerghatta, Bangalore South
Drilling time: mid February, 2011

Backyard clearance: North-east corner,
6 feet from north side,
10 feet from east side
Depth of borewell : 356 feet
Depth of 6.5 ” casing : 24 feet
Depth of 10" PVC Casing pipe: 20 feet.

Yield data :

I yield: 55 feet, 1.5", silt, boulders found
II yield: 180 feet, 0.25", silt, boulders found
III yield: 292 feet, 0.25", loose soil

Filter pipe depth : 354 feet (PVC pipe with holes)
Driller Recommended motor: air compressor

It is meant to be used during the house construction, and then to supplement the Kaveri water (municipal supply) for a smally family of four members.

While drilling, the driller said he got rock very early, I think at around 20 feet. After completing the drilling, he strongly advised to go for filter pipes for the full length of the borewell because of silt and boulders. This filter pipe turned out to be PVC pipes with perforations in its entire length.

Right now the borewell is capped. As I am now starting the construction, can you please advise what
type of pump should I go for ?


regards

Sholla

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I had drilled a borewell in Whitefield bangalore, Kundalahalli area around 3 years back of 6 and 1/2" diameter to 740 feet.Read More

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Casing to address gaps in water source ? - Bangalore

We recently drilled a borewell - 6inch diameter and hit water at 340 feet. While drilling the borewell, there were small discoveries of water at 120 feet and also at 180 feet. We continued drilling upto a large water table was reached; which we hit at 340 feet.Read More

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Borewell to RWH System Connection - Annual Maintenance?

I recently read in a local newspaper that before the onset of the monsoon it is advisable that a kilogram of bleaching powder is added to the borewell which is used for Rain Water Harvesting purposRead More

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Borewell Water Contamination : Solutions? Malleswaram

Ours is a 12 house apartment in Malleswaram. We were happily using the borewell water for the past 2 years without any problem. One day we noticed that the water colour had changed and there was a foul smell. We gave the water for testing and found that the water was infected with bacteria. Read More

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Borewell Water Treated by RO - Troubleshooting for System!

Dear Sir/Madam,Read More

Download these documents : Size
Water Test samples before and after filteration.xls18.5 KB
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High water level in new borewell - Reasons?

We had recently had three borewells drilled in our rather large apartment situated in the Mahadevapura area of Bangalore (former CMC). Of this one borewell yielded about 1 1/4" of water aRead More

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