Groundwater vulnerability assessment in shallow aquifer of Kathmandu Valley using GIS-based DRASTIC model

摘要: In this paper, groundwater aquifer vulnerability map has been developed by incorporating the major geological and hydro-geological factors that affect control contamination using GIS based DRASTIC model. This work demonstrates potential of to derive a overlying various spatially referenced digital data layers portrays cumulative sensitivity ratings across Kathmandu Valley, Nepal, providing relative indication contamination. fact, is natural resources in for drinking purpose. The decline levels due over exploitation thus extracted water from shallow contaminated infiltration pollutants polluted river land surface continuous serious. As demand human industrial use escalated at same time, engineering environmental costs are much higher new supplies than maintaining existing sources already use. Management source protecting its quality therefore essential increase efficient supplies. Aquifer maps study valuable tools planning predictive management. Further, analysis performed evaluate influence single parameters on assessment such some subjectivity can be reduced extent then weights have computed each parameters.