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Suranga

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Suranga (also Surangam or thurangam) (English: Tunnel well) is a traditional water management system used to provide a reliable supply of water for human settlements and irrigation in Kasargod district of Kerala and Dakshin Kannada district of Karnataka, India. A suranga is basically a horizontal tunnel dug in the slope of a laterite hill for about 30 metres (98 ft) to 40 metres (130 ft), which uses gravitational force for extraction of the underground water and collect into a storage tank. As both the areas are covered by uneven and steep laterite hill which makes boring of traditional bore well hard and expensive, surangas are considered as a relatively cheap option.

There are two types of surangas - : 1) dug in the hillocks with the help of galvanized pipes in a horizontal direction, from where the water percolates out (known as addaboru in Kannada) and 2) horizontally dug tunnel like structures which are as high as the height of a man, from where the water percolates out and collects into a water tank.

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