What are the pros & cons of slotted pipes in borewell?

Hi All,

I need guidance on whether we need slotted piping/casing for our borewell or not? What are pros and cons for this?

The pump was stuck and was fished out through steel cable after cutting the water supply pipe. The scanning report says that there are loose bolders in the first 200ft of 1100ft borewell which can cause problem in future so as a solution, we have put slotted pipes till the bottom.

The borewell scan reports (both before fish out and after) are attached. I checked with 3 more persons and all had different views. Some say it is required and will help, while others say not required and it will evetually jam the slots/screens and slow down the water.

I need your help and neutral guidance to answer the following questions

  • Is installation of slotted pipe required in our case.
  • If yes, what type of pipe would be better.
  • If no, Is there any alternative solution?

Note - we do have issue of black silt coming in the water supply and it clogs our overhead tank suplly pipeline.

BORWELL INFORMATION

  • Borwell depth - 1090 ft
  • Motor/Pump -Texmo, 75 Stages, 7.5 BHP.
  • Drilled and Installed in Mid 2012.

BACKROUND

A month back our borewell didn't start in the morning. intially thought some phase issue but all 3 phases were alright. So we called our borwell contractor who drilled the borewell and installed the pump/motor almost 2 & half year back.

In order to troubleshoot, they started pulling out the pump/motor, but it got stuck at around 250ft. So they put soap & detergent to smoothen it but no luck. We then got the Borewell scanner, which gave following report.

 

Borewell Scan -1 (When Motor was stuck)

Report

1

Bolder Start

60 ft

 

Bolder end

110 ft

2

Water Level

200 ft

3

Cable & Rope & Pipe Jam.

(Camera Not Passing

245 ft

 

Video

 

Borewell Scan -2 (After fishing out the motor)

Report

1

Metal Casing

Upto 48 ft

2

Dry Source

49 – 200 ft

3

Loose Boulders

49 – 200 ft

4

Water Level

580 ft

5

Water Source

580 ft

6

Water Source (Loose)

950 ft

7

Water Source (Loose)

1045 ft

8

Total

1090 ft

 

Video

 Also attached:

  • Quotation for slotted pipe
  • Images of slotted pipe suggested.

Thanks for reading the long description. I would really appreciate if you could share your views and help us for a long term solution. 

Regards

Gaurav Sharma, President

Vandana Vayu Shakti Owner Welfare Association,Bangalore

 

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