Role of Kaolinisation in the Khondalitic Aquifers of Eastern Ghats (India)

  • Venkateswara Rao BekkamEmail author
Conference paper
Part of the Advances in Science, Technology & Innovation book series (ASTI)


Khondalitic suite (garneti ferrous Sillimanite gneiss) of rocks occurs extensively in the Eastern Ghats of India. When the khondalite is highly weathered due to the presence of water at low lying areas such as water courses, it becomes kaolinised and acts as a barrier to the lateral movement of groundwater, causing it to be accumulated on either side of the stream, turning the areas adjoining stream courses into non-potential groundwater areas. From electrical resistivity investigations, it has been found that the kaolinised layer is progressively increasing towards the stream, making little to no aquifer thickness near the streams. The resistivity of the kaolinised layer is found to be less than 25 Ω m and that of the weathered and fractured khondalitic aquifer is between 25 and 65 Ω m. Hydrogeomorphological studies have indicated that mostly stream courses are lineaments and between the two lineaments, there is a shallow weathered pediplain where more of high-yielding (>8000 lph) wells are observed. The transmissivity and storage coefficient values of the aquifer has decreased progressively towards the stream conforming the earlier investigations. The hydraulic conductivity of the kaolinised layer varies from 1.6 to 1.9 m/day while that of the fractured layer below varies from 1.6 to 2.3 m/day.


Khondalites Kaolinised layer Aquifer 


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Authors and Affiliations

  1. 1.Centre for Water Resources, Institute of Science and TechnologyJawaharlal Nehru Technological University, HyderabadKukatpally, HyderabadIndia

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