DRASTIC model has been used to map groundwater vulnerability due to pollution in various areas. This method needs to be calibrated and reformed for a specific aquifer and pollution. The suggested methodology was applied to Asadabad aquifer located in western Iran. In the present research, the rates of DRASTIC parameters have been reformed so that the vulnerability potential to pollution can be determined more exactly. The new rates were calculated using the relationships between each parameter and the nitrate concentration in the groundwater. The measured nitrate condensation values were used to correlate the pollution potential in the aquifer to DRASTIC index. The results showed that the modified DRASTIC is better than the original method for the nonpoint source of pollutions in agricultural zones. Application of the new rates, a new DRASTIC map was expanded that shows that 2.1% of the area fall in high vulnerability class. The assessed area was 34.2% and 58.19% for moderate class and, for low vulnerability class, 63.7% and 31.39% respectively, before and after using the new rates.
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Published by: National Cave Research and Protection Organization, India
<Environmental Science+Zoology+Geology+Cave Science>AMBIENT SCIENCE