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Water harvesting is the activity of direct collection of rainwater, which can be stored for direct use or can be recharged into the groundwater. Each state of India has its own water harvesting structures reflecting geographical peculiarities and cultural uniqueness of the community. The residents of different states in India have developed their own indigenous water harvesting techniques to meet their water requirements. There were many water harvesting structures prevalent in Tamil Nadu since ancient times. Water Harvesting primarily aims at collecting and storing any form of water rainfall, runoff

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A total of 46 statements, that determine the perception of Ragi Expert System, were spread among three main components viz., over all perception, message and technical components. Responses were obtained through structured interview schedule from a sample of 120 respondents who were selected from ten villages of Krishnagiri district of Tamil Nadu. The usefulness, merits and difficulties that they perceived in deriving information and diagnosis symptoms and knowledge gained on remedial measures through expert system were tabulated. Though expert system is powerful to motivate the people, still some more pictorial representation, easy navigation, concurrent information simple and understandable language should be incorporated to reach the farmers on a large scale.