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Muddy Borewell Water: Solution Needed! - Varanasi, Uttar Pradesh

This summer we had a borewell dug at Varanasi, Uttar Pradesh. Below are the details of the system. 


Was drilled till 260ft, during pipe insertion it went till only 200ft. 4.5inch pipes have been put inside. 60ft pipe at bottom is jali wala pipe, 140 ft ordinary pipe. Pipes are surrounded by stones (gitti). 1 horsepower pump (1inch) is inserted inside at 100ft. After 3 days the contractor ran compressor for 3hr. During the drilling process clean water was obtained, but ever since it has been providing muddy water. Is there a permanent solution for the issue? 

please help

thanks.

Krishna

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Comments

1. Muddy borewell water

Varanasi city is located on the great Indo-Gangetic alluvial plains.Naturally when borewell is drilled alluvial formations comprising of clay,silt,sand,pebbles and gravels encountered in different depths.The borewell was drilled upto 260 feet but pipes could go upto 200 feet measn from 200 to 260 feet, the strata was collapsed.For shallow Tubewells local boring methods can some extent successful,but when the borewell is constructed upto 260 feet the borewell should be constructed on proven technical methods.That is employ direct Rotary method using mud circulation,log the subsurface formations correctly by qualified geologist so as to suggest proper assembly (blank pipe,slotted pipe,bail plug etc),gravel packing as per subsurface formations etc.Then develop the Tubewell for few hours until the water become fresh free from mud.

In the borewell in question probably the muddy water is surging into borewell from undergroud collapsable alluviam or due to wrong placing of blank pipe and slotted pipe.For further details Director,Central Groundwater Board,Lucknow can be contacted.

2. Muddy bore well water - solution

It is true that the cited borewell is yielding muddy water. It is the fact and we all should accept that the whole process of drilling, designing and developing the boprewell has been handled wrongly with out using the availabe technologies.

In view of the dynamics & complexity of the groudnwater situation, it is better to follow the availabel technolagies as: 

1. Selection of the site for drilling by the use of geological, geophysical with the available data base along with estimate of depth, quantity and quality of water.

2. Drill to the depth

3. Deploy simple geophysical sub-surface tools for mapping the clay and sand layers with quantity & quality of water, depth of the aquifers and other related information.

4. Design the casing accordingly to put the slots against the selected aquifers and plain pipe against the clay and other unwanted layers.

5. Deply the casing and develop it for removing the polluted or muddy water and further clean water.

Accordingly, in the present case, to get clean water, do the following:

a. remove the pipe and map the sub-surface layers with the use of simple geophysical tools such as: self potential and resistivity.

b. Design the casing

c. Deploy it and develop the same.

Hope this helps you to come out of the problem of getting the muddy water.
All the best

3. Placing of the slot pipe may be improper

Occurrence of muddy water is a very common problem in shallow tubewell drilled in alluvial soil, if the placing of the slot pipe (jali wala) is improper. The fact that the pipe did not go below 200' means that the slot pipe is placed at a depth of 140'~200'. A part of this range ie. 140'~200' might be in the mud zone rather than sand zone which is causing the mud to flow in the slots and hence resulting in muddy water.

A probable solution to this can be re-development of tubewell by air-compressor, but I am not sure what is the pressure rating of the pipe. The compressor can try taking out the mud/sand from the slotted zone and can possibly get the gravel (gitti) to settle properly around the slotted pipe, forming a filter.

Another reason may be that you are probably using a 1 H.P. pump which is causing over-pumping in the tubewell and hence the muddy water.

On the whole, the method of drilling is extremely important in the borewell, be it a deep well or a shallow well. Using a proper method and technique is always the best and permanent solution. For any non-mechanical/manual drilling method, only hit and trial can be done.

Hope it is helpful.
Regards,
Shivam Nigam

4. Bore dug in area covered with water 4-5 months/year-will it work

I dug a borewell in my farming land in Gwalior (MP).  The area where it is situated is filled with the water during the rainy season or in short that area is covered with the water 4-5 months/ annum. My question is that this will this be successful. The details of borewell is as follow: Bore width: 12 inch depth: 102 feet with PVC casing up to 97 feet.

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