ANALYSIS OF THE SPATIAL VARIATION OF SAR IN THE RURAL AREA OF AURANGABAD BASED ON GIS MAPPING TECHNIQUES

摘要

River and groundwater are the major source of drinking and irrigation water supply in rural and urban area of the region. The annual groundwater withdrawal in the country is 231 Billion Cubic Meter/Year (BCM) (213 BCM used for irrigation and 18 BCM used for drinking). Groundwater is the preferred alternative in most part of region, which is facing threats due to anthropogenic activities, leading to deterioration of groundwater quality. To find the deterioration cause, the groundwater sample near the Kham River (Nalla) has been taken for study purpose. In the given study, total 54 groundwater samples have been collected from different part of Aurangabad city. The samples were analyzed for Pre-monsoon and Post-monsoon season for year 2014 for their pH, Electrical Conductivity (EC), Total Dissolved Solids (TDS), Sodium (Na), Calcium (Ca) and Magnesium (Mg). Suitability for irrigation was determined on the basis of the diagram of US salinity Laboratory (USSL), Sodium adsorption ratio (SAR), and Percent (%) sodium (PS). Samples were categorized in left bank and right bank samples. It was observed that 29.90% (n= 8) groundwater samples along left bank and 14.8% (n= 4) groundwater samples along right bank are in medium sodium hazard category. According to USSL diagram, nine samples along left bank and thirteen samples along right bank of kham river fall in category C_3S_4, indicating high salinity and very high alkaline water and addresses.