Borewells and Tubewells

India being an agrarian country, our farmers depend mainly on groundwater for irrigation. With increasing population, lesser land holdings and urbanisation, deeper borewells are dug for groundwater abstraction. Borewells & tubewells, are very similar. Both are basically vertical drilled wells, bored into an underground aquifer in the earths surface, to extract water for various purposes. The difference in the two lies in the type of casing used, the depth of this casing and the type of soil where they are drilled. Casing to support the external surfaces of the borehole against collapse may be needed at certain depths, and usually is made up of PVC pipes. Electrical pumps are usually used to pump out the water fro the borewells, though the government is now giving subsidy for solar pumps. This convenience of pumps may increase the depletion of the groundwater at an increased pace.

Our FAQ on borewells, deals in detail with topics ranging from the initial planning, selection of site to final commissioning, maintenance of the structure and problems associated with existing borewells,. Another Frequently asked questions (FAQ) on Groundwater - Understanding the basics, narrows down the existing knowledge gaps amongst the common groundwater users.

Excessive drilling of borewells has led to exploitation of groundwater at higher rates than the rate of water recharge and caused depletion of the groundwater levels. To monitor this many states like Karnataka & Kerala have come up with laws & a statutory authority to regulate and keep tabs on the groundwater utilisation. Some states have implemented groundwater legislation acts which prevent drilling of borewells without the permission of Government Bodies in water scarce regions. However, some states allow only drilling of drinking water borewells without the need for obtaining permission. Therefore, it is advisable to explore the details of it before drilling a borewell.

Central Ground Water Board (CGWB) has come with reports on the groundwater status in the country. Uncontrolled use of bore well technology leads to exploitation of groundwater at higher rates than the rate of water recharge, which may cause drastic depletion of groundwater. 

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This paper published in the Indian Journal of Dental Research describes the findings of a study that aimed at assessing the oral health status of 11-15 year old school children from Kanyakumari district. The survey focused on determining the prevalence and severity of dental fluorosis along with assessing the various risk factors involved. Nearly 12 million of the 85 million tons of fluoride deposits are found in India. It is therefore not surprising that dental fluorosis is endemic in 15 states of India. The highest rates of endemicity have been reported from Andhra Pradesh, Haryana, Karnataka, Punjab and Tamil Nadu. Posted on 22 Feb, 2012 01:51 PM

A total of 1800 children  from all the nine blocks of Kanyakumari district from 6th to 10th standard were examined using type III examination. Dental fluorosis was present 15.8% of the study population and varied from as low as 1.4% to as high as 29.4% in different areas. There was a significant difference in dental fluorosis levels between rural and urban residents.

Evaluation of physico-chemical characteristics in groundwater using GIS – A case study of Chinnar sub-basin, Cauvery River, Tamil Nadu, India
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The study found that the groundwater of the basin is extremely hard with total hardness, magnesium and potassium contents being above the permissible limits. Thirty nine out of 57 samples exceed the allowable limits for fluoride.

location map of Chinnar sub-basin and spatial distribution of ground water

Groundwater hydrology and groundwater quality in and around Bangalore city - Department of Mines and Geology (2011)
This report by the Department of Mines and Geology describes the findings of a study on urban groundwater hydrology and groundwater quality in and around Bangalore city. Posted on 19 Jan, 2012 11:04 AM

Earlier studies carried out by the Department of Mines and Geology during 1994, 1995 and 2003 on the groundwater quality of Bangalore Metropolis had found that the groundwater pollution in the city has mainly been due to sewage disposal and recommendations have been made to prevent pollution from sewage and industrial wastes.

Dynamic groundwater resources of Karnataka (2009)
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It also presents the status of utilisation of groundwater in Karnataka as on March 2009, both on watershed (sub catchment) and taluk wise areas having 2008-2009 as the base year. The methodology is improved as the estimations are carried out on watershed basis for both command and non command separately than apportioned to taluks.

Sustainable groundwater management – Report of the Working Group of the Planning Commission for the 12th Five Year Plan
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The existing methodology of groundwater resources assessment is appropriate and suitable for country-wide groundwater resources estimation, considering the present status of database available with the Central and State agencies.

Status of groundwater quality in India - Report of the survey conducted in metropolitan areas by the CPCB
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The report recognises that most groundwater quality problems are anthropogenic in origin, caused by a combination of over-exploitation and infiltration of wastes. Inadequate infrastructure and resources mean that waste generated by cities and industrial areas is not properly collected, treated and disposed, thus leading to grondwater contamination.

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Polluted river stretches in India: Criteria and status - A report by Central Pollution Control Board
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This brief report by the Central Pollution Control Board (CPCB) presents an analysis of the monitoring of the water quality in India under the National Water Quality Monitoring Programme. The water quality data for the years 2002-2008 has been analysed and monitoring locations exceeding the water quality criteria have been identified as polluted locations with respect to risk.

Institutionalization of users' level - Water quality monitoring and surveillance in Gujarat - A report by WASMO
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WASMOThe programme focused on community involvement in assessing and evaluating water quality.

Odisha Groundwater (Regulation, development and management) Bill, 2011
A press release by Odisha Water Forum expressing concerns on the draft Bill. Posted on 09 Sep, 2011 06:44 PM

Content courtesy: Odisha Water Forum 

The Odisha Groundwater (Regulation, Development and Management) Bill, 2011 has been placed before the Odisha Legislative Assembly in this session. Odisha Water Forum has gone through the contents of this bill. While Odisha Water Forum appreciates the initiative of the Government of Odisha to regulate development and management of groundwater, it is concerned about the fact that this bill does not address the fundamental concerns regarding groundwater management.