Statistical comparative evaluation of chloride concentration in selected groundwater samples of Kolar District, Karnataka, India
Author(s): Krishnappa S
Abstract: Groundwater levels have been dropping at an alarming rate for Last few decades in all talukas of Kolar district and it has been declared as ‘over-exploited'. Presently in the District Kolar 94% of drinking water demand meet by only groundwater, hence its quality is important. Fifty water samples were collected from selected bore wells of five talukas of the district for the period of 2014 and 2015 in pre-monsoon and post-monsoon season. Parameters analyzed are different physico-chemical parameters, among them more emphasis on chloride. Result of the analyses showed that all the samples for chloride parameter have permissible concentration except few samples. The paired t-test of pre-monsoon and post-monsoon season during the year 2014 and 2015 are depicted that the p-value are 0.005 and 0.001 respectively which are less than the significance level alpha of 0.05. In other words, there is a significant difference in the mean score of chloride concentration between pre-monsoon (mean = 312.6) and post-monsoon (mean = 248.8) season during 2014 and mean score (mean = 248.1) and post-monsoon (mean = 121.6) during 2015. As the mean concentration of chloride in post-monsoon is lesser (here lower the mean, lesser the chloride concentration) that of pre-monsoon season, it is said that there is statistical evidence to conclude that chloride concentration reduced in post-monsoon season.
Krishnappa S. Statistical comparative evaluation of chloride concentration in selected groundwater samples of Kolar District, Karnataka, India. Int J Multidiscip Trends 2019;1(1):128-132. DOI: 10.22271/multi.2019.v1.i1a.470