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Muddy Water From Borewell & Dug Well : Solutions Sought - Trichur Dist., Kerala

A dug well and borewell in our land is yielding muddy water. More details regarding the borewell are as below. Location is in Kerala state in the district of Trichur and bore well is in the south east corner of the plot. The borewell is 165 feet deep and diameter is 4 inches and we use a submersible pump of 1 HP.  Casing has been put in for 30 feet depth, 2 inch plastic pipe. The borewell was drilled in March 9, 2007. The dug well is 12 meter in depth.

How can we get rid of this muddy water?  Kindly suggest a suitable method.

Nair

g4213@india.com

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Comments

1.

Dear Nair,

Normally, for a 4 inches diameter bore well the casing provided has 4 and half inches diameter. You have mentioned as 2 inch plastic pipe. It is little confusing. Is it a typographical error or is it the actual diameter, since for 1 HP. Submersible pump normally, one quarter inches diameter or one inch diameter pipe is used.

If the casing pipe provided is 2 inches up to 30 feet then lot of loose earth is falling from the top loose part of the bore well. Your terrain is a red lateritic bearing one and iron and aluminium rich, clay due to moisture slip into the bore well and hence it is coming out while pumping. Whenever you pump out during earlier part of your pumping period, the reddish clay or the red bole mud will naturally come out.

When you stop the pump the water level will recoup and while you start pumping the water level will fall drastically to low level. In this gap a heavy drop down of this red bole will take place. In the remaining period, the slow recuperation will bring along with this the colloidal clay particle between the gaps of the pipe and encompassing bore well wall. This trickling slowly settles the clay at the bottom of the well.

Since the top laterite is hard enough your bore well is not fully filled with this red bole clay and still functioning.

In case if you have provided 4 and half inches casing pipe then the length of the pipe is not sufficient enough and you might not have covered the entire lateritic part. If you have got a yielding zone just near the junction / contact zone of the top laterite and underlying hard weathered Gneiss and if you have not provided the casing pipe to arrest the brownish colour bearing flow of mud and water mixture, that had occurred while drilling then also the flow will carry the colloidal clay particle down and while pumping you will get the mud flow.

The remedial action would be that you remove the entire casing pipe, flush or clean the bore well again with the use of drilling machine and erect a correct casing pipe to the required length. In case if you have obtained spring, may be in the block coloured rock please do not block it with this proposed increased casing length. Normally around 35 to 40 feet you get this type of clay mix spring is reported in your area. Hence you may use 4 and half inches casing and to the required length will block the clay fill and gush. Please engage an experience drilling contractor to do the job.

With best wishes,

A. Rajamohamed Ambalam
Geophysicist
Coastal Energy Private Limited
Chennai - 600006

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