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      Application of drastic model and GIS: for assessing vulnerability in hard rock granitic aquifer.

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          Abstract

          Geographic information system (GIS) has become one of the leading tools in the field of hydrogeological science that helps in assessing, monitoring, and conserving groundwater resources. Groundwater is a finite resource, which is being overexploited due to increase in demand over the years leading to decrease in its potentiality. In the present study, DRASTIC model has been used to prepare groundwater vulnerable zone in hard rock aquifer of granitic terrain. The main objective is to determine susceptible zone for groundwater pollution by integrating hydrogeological layers in GIS environment. The layers such as depth of aquifer, recharge, aquifer yield, soil type, topography, vadose zone, and transmissivity are incorporated in the DRASTIC model. The final output of the map shows that around 60% of the area falls under low to no risk of pollution zone. The high risk of pollution zones are mostly present towards the margin of southeastern periphery. The lower part of the basin as well as small area on northern side falls under moderate risk of pollution zone. For the assessment of groundwater pollution zone, 24 groundwater samples have been collected from different vulnerable zones. The chemical analysis of sample shows that the southeastern margin of basin has relatively high concentration of nitrate as compared to other parts of the basin. It is present in high pollution zone as well as moderate pollution zone. The present model can be used for assessment and management of groundwater.

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          Author and article information

          Journal
          Environ Monit Assess
          Environmental monitoring and assessment
          Springer Nature America, Inc
          1573-2959
          0167-6369
          May 2011
          : 176
          : 1-4
          Affiliations
          [1 ] NGRI (CSIR), Groundwater Building, Uppal road, Hyderabad, 500007, India. ranjeet.ngri@gmail.com
          Article
          10.1007/s10661-010-1572-7
          20582738
          525b4f4f-5ce4-4aed-9d2e-6cb626ea2282
          History

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