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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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Comments

1. opinion called for - on ground water exploration-Results attache

The recommendation says good for open well. But the soil profile only no rock till 60 ft. 

Do you see shallow dug wells in any of the sites in the neighbourhood?

If there are then you can also go in for a dug well as it can easily take large volumes of rainwater and remain sustainable.  Also pumping costs will be low. If no wells at all exist, then you can get a test borehole dug done by hand to know the profile of the soil upto about 30 ft. if the soil is clayey tiil that depth, a well may not be feasible.

Indukanth Ragade (isragade@yahoo.com)

2. Opinion called for on - Groundwater Exploration

It appears that, stakeholder has followed the technology. Hope stakeholder has not drilled the open well or borewell. Wait to get better solution with out wasting money. 

My refelctions on this key challenge includes:

 1. The statement "Previous borewell drilling on 2 occasions in the last year did not display any rocks till 50 feet depth in this area" indicates that the area is affected by sand accumulation. Check this.

2. The data furnished under VES readings should be added its corresponding AB/2 i.e. half of the current electrodes spread to know the depth of information. VES data donot support the recommendations.

3. The VES data reflects that they represent "A" type of curve representing increasing trend of resistivity with depth. The expectd groundwater layer either fractured or weathered layer with water as a "low resistivity" has not been recorded. Supply of VES interpretation results like: number of layers, layer thickness & resistivity are essential to use them for getting better solution.

4. Then the recommendation of the open well or bore well  including depths are based on other than geophysical interpretation / resutls as the inference of geophysical data is expected some thing different.

5. Check this with the local government groundwater department before moving further.

Hope this helps the stakeholder to move forward with better solution....

All the best

3. Dried well in tribal area Thane/ Raigarh district

Good day

Great survey. I am a researcher in Mumbai university trying to conduct survey on the use of GIS for procuring drinking water from dried wels. 

Do you have any maps related to the above area and also about underground water?

Dr. Diwanji

4. Water divining

Dear Mr Krishnan,

I am a water diviner. Would you kindly view my site http://groundwatersolutions.blogspot.com. If you need any assistance I shall be glad to help.

Sincerely

Guna Sekhar

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