Hydrogeochemical Behaviour and Assessment of Groundwater Quality from WGAMG'0 Watershed, Chimur Taluka, Chandrapur District, Maharashtra

摘要

The study area of WGAMG’0 watershed is bounded by longitudes 79°14’00” and 79°21’00” and Latitudes 20°31’00” and 20°36’00” N and covers 11 villages of Chimur Tehsil, Chandrapur District, Maharashtra. Fourteen dugwells were identified and fixed as observation wells to gather the information on pre-monsoon water level fluctuation, depth to hard rock, water bearing zone, average depth of wells, average diameter of wells and other related hydrogeological data. The collected groundwater samples having pH values 7.3 to 8.1 are dominantly alkaline. While the electrical conductivity values of the collected samples vary from 845-1132 μS/cm. The TDS values from deeper aquifers range from 596-724 mg/L and the total hardness ranges from 281-616 mg/L respectively. The anion chemistry of groundwater samples from the study area is dominated by HCO3, Cl, SO4 and NO3. The concentration values ranges from 325-566 mg/L, 12.3-34.1 mg/L, 6.3-56.1 mg/L and 75.4-258.3 mg/L respectively. The primary source of HCO3- is considered to be the dissolution of minerals like calcite and dolomite, where in addition to that the CO2 gas is also dissolved through the process of anoxic biodegradation of the organic matter in deeper aquifers. In the present area of investigation, 100% samples fall in the range of 500-1000 mg/L indicating that water samples are of freshwater in nature and permissible for drinking. The suitability of the groundwater for irrigation purpose has also been checked by estimating the following values: Sodium Adsorption Ratio (SAR), U.S. Salinity Laboratory diagram, Percent Sodium (% Na), Residual Sodium Carbonate (RSC), Soluble Sodium Percentage (SSP), Mg Ratio (MR), Corrosively Ratio (CR), Kelley’s Ratio (KR) and Permeability Index (PI). These parameters have brought the marginal utility for irrigation purpose.