Hydrogeochemical Characteristics of Groundwater: A Case Study from KadavanarWatershed, Amaravathi Sub-basin, Cauvery River, South India

Abstract

The aim of this study is to the groundwater chemistry at Kadavanar watershed, Cauvery river, South-India. This paper demonstrated that the interrelationship of rock types and groundwater chemistry using piper trilinear diagram and multi-rectangular diagram (MDRs). Well-developed sampling technique was used for this study. Four km equal grids were designed in plain region. Each intersect points are selected for groundwater sample locations. Groundwater samples 147 m.l. were collected on April 2016 (Pre-monsoon). Groundwater samples were analyzed for major ions (pH, EC, Ca²⁺, K⁺, Na⁺, Mg²⁺, HCO₃^-, SO₄^2-, NO₃^-, CO₃^-). Analytical results were used, to prepare the Piper Triangles Diagram and multi-rectangular diagram (MRD), Gibb’s, USSL and Wilcox diagrams with respect to geology. As per the piper triangles diagram reveals that 53.06 % samples fall under Sodium chloride (NaCl) alkalies exceed alkaline earth class. Concluded that the Multi-rectangular diagram (MRD) interpretation result is reflected same as reveals piper triangles diagram result. Gibb’s diagram shows that the chemical concentration of the groundwater in mainly depends upon the rock water-interaction. Other irrigational classification diagrams such as USSL (63.95 %) and Wilcox’s (67.35 %) diagrams interpretation reavel that the majority of the groundwater samples fell under suitable for agricultural uses.