Evaluation of groundwater potential zones in the sub-watersheds of north pennar river basin around Pavagada, Karnataka, India using remote sensing and GIS techniques |
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Authors: | S Srinivasa Vittala S Govindaiah H Honne Gowda |
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Institution: | (1) National Geophysical Research Institute, Hyderabad, 500 007, Andhra Pradesh, India; |
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Abstract: | The study area is one of the watersheds of North Pennar basin, covering an area of 570 km2 in Pavagada taluk of Tumkur district. The watershed has been subdivided into nine sub-watersheds namely Dalavayihalli, Maddalenahalli,
Talamaradahalli, Puluvalli tank, Nagalamadike, Gowdatimmanahalli, Naliganahalli, Devadabetta and Byadanur. These nine sub-watersheds
have been evaluated to delineate groundwater potential zones based on the characteristics of geomorphic units together with
slope, geology, lineaments, borewell data using Remote Sensing and Geographic Information System (GIS) techniques. Slope varies
from nearly level (0–1%) to very steep (>35%). The different geomorphic units in each sub-watershed consist of denudational
hills, residual hills, inselbergs, pediment inselberg complex, pediments, shallow weathered pediplains, moderately weathered
pediplains and valley fills. The lineament map for each sub-watershed has been prepared and the trends were analysed with
rose diagrams. The analysis of borewell locations and their yield data in association with lineaments at subwatersheds level
reveals that the lineaments are acting as a pathway for groundwater movement. The integrated map comprising groundwater potential
zones prepared by “Union” function using GIS indicate that valley fills and moderately weathered pediplains are very good
to good, shallow weathered pediplains are good to moderate, pediment inselberg complex and pediments are moderate to poor
and denudational hills, residual hills and inselbergs are poor to very poor groundwater prospect zones. |
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