Abstract
EVALUATION OF GROUNDWATER SUITABILITY FOR DRINKING AND IRRIGATION – A CASE STUDY OF YADAGIR DISTRICT, KARNATAKA STATE, INDIA

Kumara Naika, Ravikumar P. and K. L. Prakash*

ABSTRACT

An investigation has been made to study the ground water suitability in the Yadagir district. Ninety groundwater samples were collected randomly from Yadagir district during pre-monsoon season, 2018. The samples were analyzed for physico-chemical parameters and irrigation quality parameters of sodium absorption ratio (SAR), Percent sodium (%Na) and residual sodium carbonate (RSC) as per Standard Methods. The results indicated that, the pH values of 8.82% of Yadagir, 60% of Shahapur and 87.1 % of Shorapur samples were above the BIS standard limit of 6.5-8.5. The higher level of pH value of groundwater samples was due to higher alkalinity and bicarbonate contents. Around 35% of the samples showed Electrical conductivity above 2000 μS/cm, which can be correlated with high range of TDS values. Among the irrigation parameters, around 8 % samples in Shahapur taluk showed excess SAR values of more than 18 and are unsuitable for irrigation purpose. A very high range of percent sodium values were observed in 34.3, 56 and 45.2 % of samples respectively among the Yadagir, Shahapur and Shorapur taluks and are also classified as unsuitable for irrigation. The RSC values (>1.25 meq/L) were reported for 44.1% (Yadagir), 72% (Shahapur) and 80.6% (Shorapur) of samples, makes these samples unfit for irrigation. Further, WQI values indicated that 65.6 % of the samples were considered as unsuitable for domestic and irrigation purpose, due to higher range of salts / salinity, total hardness, sodium and bicarbonates values.

Keywords: Ground water, Salinity, SAR, Water Quality Index, Yadagir district.


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