Seasonal Variations in the Quality and Chemistry of groundwater in Erravagu Sub-basin, Guntur District, Andhra Pradesh
Author(s):
G. Babu Rao
Keywords:
Groundwater Quality, Erravagu Sub-basin,rock weathering, brackish
Abstract
An investigation was been carried out in Erravagu sub-basin of Guntur District, Andhra Pradesh by collecting a total of 40 groundwater samples for two seasons namely pre-and post monsoon to decipher hydrogeochemistry and groundwater quality for determining its suitability for drinking and irrigation purposes. The study area is underlain by peninsular gneissic complex and granite intrusives of Archaeans, and shales, phyllites, limestone and quartzites of Proterozoic age. The quality of groundwater is characterized by alkaline nature, fresh to brackish and moderate hard to very hard during pre- and post-monsoon periods. This is not suitable for drinking as well as for irrigation in most locations. The chemistry of groundwater in the study area is controlled by rock weathering, mineral dissolution, ion exchange and evaporation. This is also supported by the dominance of Na+: HCO facies. The sources of anthropogenic origin appear to be caused for elevation of various chemical variables, which is responsible for brackishness in the water. Pipers diagram also suggest that the groundwater quality is initially fresh and is subsequently modified to brackish.
Article Details
Unique Paper ID: 146787

Publication Volume & Issue: Volume 5, Issue 1

Page(s): 941 - 946
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