Geochemistry and Water Quality Evaluation for irrigational Suitability of Ilkalhalla Sub-basin, Bagalkote and Koppal Districts, Karnataka

IJEP 42(6): 738-744 : Vol. 42 Issue. 6 (June 2022)

Shilpa P. Muragod, Ajaykumar N. Asode and Sreenivasa A.*

Karnatak University, Department of Studies in Geology, Dharwad – 580 003, Karnataka, India


A detailed study was carried out to evaluate the geochemical processes regulating groundwater quality and to assess the suitability of waters for agriculture in Ilkalhalla sub-basin of Bagalkote and Koppal districts of Karnataka, India. The area is composed of sandstone, pink and grey granite, granodiorite, metasediments and metavolcanics. The above studies were carried out by collecting 77 representative water samples each during pre-monsoon and post-monsoon seasons. Collected water samples were subjected to physical and chemical analysis following standard operating procedures. Based on the results of analysis, irrigational parameters, such as SAR, Na%, RSC, PI and KI were calculated. Based on the TH values almost all the samples are falling in category of hard to very hard (>150 mg/L) during both seasons. Based on RSC values 7 and 20 number of water samples during PRM and POM, respectively are found to be unsuitable for use in groundwater. Based on USSL diagram, most of the water samples are falling into class of high salinity hazard type during both seasons which indicates that high salinity and low sodium waters are moderately suitable for irrigation purposes.


Ilkalhalla sub-basin, Water quality, Granites, Sodium absorption ratio, Kelley’s index


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