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World Journal of Engineering
Research and Technology

An International Peer Reviewed Journal for Engineering Research and Technology

ISSN 2454-695X

Impact Factor : 5.924

ICV : 79.45

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Indexing

Abstract

GEOELECTRICAL INVESTIGATION FOR GROUNDWATER EXPLORATION: A CASE STUDY FROM RAMANAGARA TALUK, KARNATAKA, INDIA

A. V. Ganesha* and S. Suresh

ABSTRACT

The role of Electrical Resistivity Method for groundwater exploration is vital, which provides lot of information on hidden subsurface hydro-geological conditions accurately. This non-invasive method designed for estimation of dynamic and static ground water reserves as well as to infer depth and thickness of various subsurface layers. Vertical Electrical Sounding (VES) were conducted in selected zones of Ramanagar taluk, Karnataka using the Schlumberger array configuration for identifying subsurface lithology favourable for occurrence of groundwater. VES data were collected and interpreted using conventional curve matching and computer iteration method. The geoelectric sections revealed top soil, weathered rock, fractured bedrock and fresh bedrock. The value for topsoil ranges from 20?m to 250?m with thickness varies from 0.3m to 2.0m. The second layer is weathered rock and resistivity ranges from 50?m to 100?m and thickness of 1.0 m to 10.0m. The third favourable layer is fractured basement which ranges in value from 100?m to 150?m with thickness ranges from 3m to 23m. The fresh or bedrock basement has a resistivity of 1000?m to infinity. The saturated zone of the weathered and fractured basement at depth will favour groundwater exploration and development in this area, while the thin layer of soil profile with gentle slope would serve as the protective layer and recharge area in the study area.

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