Ground water is used as a drinking water source and also for backgarden agriculture and aquaculture primarily in the dry zone. Boreholes/Tube wells consist of a narrow, screened tube (casing) driven into a water bearing zone of the subsurface. The borehole efficiency (high efficiency means both high yield and high success rates) changes with the bedrock geology. One of the main reasons for selecting this technology is that, under surface water stress situation the ground water can be substituted for domestic purposes as it free of pollutants. The total cost of construction of a hand pump tube well (HPTW) and a production borehole are Rs. 193,920 – Rs. 210,080 and Rs. 198,550 – Rs. 219,450 respectively 26 out of which 50% is for drilling of the well, 20% is for screening, 15% is for testing of water quality and yield, 5% is for cleaning, communication and the balance is for demobilization 27. The total cost changes with the depth and the size of the borehole and investment cost is very high.
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