Abstract
The present study focused on the hydrochemistry of groundwater in parts of Chandauli-Varanasi region to assess the quality of groundwater for determining its suitability for drinking and agricultural purposes. Urbanization and agriculture activities have a lot of impacts on the groundwater quality of the study area. A total of 70 ground water samples were collected randomly from different sources viz. hand pump, dug wells and bore wells, and analyzed for major cations and anions. The domination of cations and anions was in the order of Na > Ca > Mg > K and HCO3 > Cl > SO4 > NO3 > F. The Piper classification for hydrogeochemical facies indicates that alkaline earth exceeds alkalis and weak acids exceed strong acid. Water quality index rating was calculated to quantify overall water quality for human consumption. Out of 70 groundwater samples, 7% and 10% samples exhibit water unsuitable for drinking purposes in pre- and post-monsoon, respectively, due to effective leaching of ions, direct discharge of domestic effluents and agricultural activities. Residual sodium carbonate values revealed that 6% sample is not suitable for irrigation purposes in both the seasons due to low permeability of the soil. The calculated values of PI indicate that the water for irrigation uses is excellent to good quality in both seasons. As per Wilcox’s diagram and US salinity laboratory classification, most of the groundwater samples are suitable for irrigation except one sample which is unsuitable for irrigation purposes. The overall quality of groundwater in post-monsoon season in all chemical constituents is on the higher side due to dissolution of surface pollutants during the infiltration and percolation of rainwater at few places due to agricultural and domestic activities.
Highlights
Groundwater is a valuable natural resource; it occurs almost in all geological formations under the earth surface not in a single widespread aquifer but in thousands of local aquifer systems with similar characteristics
The major ion chemistry data revealed that the ground water in the study area is slightly hard to very hard and fresh to brackish in nature
According to the WHO (1997) classification of water based on total dissolved solid (TDS), all the samples are within the permissible limit
Summary
Groundwater is a valuable natural resource; it occurs almost in all geological formations under the earth surface not in a single widespread aquifer but in thousands of local aquifer systems with similar characteristics. Agriculture is the main source of livelihood of the population and ground water is the major source of irrigation. Groundwater gets contaminated with a variety of pollutants generated from diverse sources such as agriculture, industrial and domestic. The availability of this important natural resource has been taken for granted increasing ground water use and pollution generation has crossed the sustainable limits in many parts, due to fast changing land use pattern. There has been tremendous increase in demand for fresh water due to population growth and intense agriculture activities. With rapid increase in population and growth of industrialization, groundwater quality is being increasingly threatened by disposal of urban and industrial solid waste [1]. Variation of groundwater quality in an area is a function of physicochemical parameters that are greatly influenced by geological formations and anthropogenic activities
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