Groundwater potential in the hard rock terrain of western ghats: A case study from Kottayam district,Kerala using resourcesat (IRS-P6) data and GIS techniques |
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| Authors: | H Vijith |
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| Institution: | 1.School of Environmental Sciences,Mahatma Gandhi University,Kottayam, 686 008, Kerala,India |
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| Abstract: | The present study was aimed to identify and delineate the groundwater potential areas in parts of Western Ghats, Kottayam,
covering the upper catchment of Meenachil river. The study area is composed rocks of Archaean age and Charnockite dominated
over others. The information on lithology, geomorphology, lineaments, slope and land use/land cover was generated using the
Resourcesat (IRS P6 LISS III) data and Survey of India (Sol) toposheets of scale 1:50,000 (surveyed in 1969) and integrated
them with raster based Geographical Information System (GIS) to identify the groundwater potential of the study area. Thus,
a GIS-based model which takes account of local condition/variations has been developed specifically for mapping groundwater
potential. On the basis of hydrogeomorphology, three categories of groundwater potential zones namely good, moderate and poor
were identified, and delineated. The high potential zones correspond to the fracture valleys, valley fills, pediments and
denudational slope, which coincide with the low slope and high lineaments density areas. The low zone mainly comprise structural
hills and escarpments and these act as run-off zones. The derived panchayath-wise groundwater potentiality information could
be used for effective identification of suitable locations for extraction of potable water for rural populations. |
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