Evaluation of Intrinsic Vulnerability of Urmia Plain Groundwater Pollution Using Original DRASTIC and Drastic Modified Models

Document Type : Original Article

Authors

1 Assistant Professor, Department of Water Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

2 M.Sc. Graduate of Irrigation and Drainage, Department of Water Engineering, College of Agriculture and Natural Resources, University of Mohagheghe Ardabili, Ardabil, Iran.

3 Associate Professor. Department of Water Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.

Abstract

The Assessment of groundwater vulnerability to pollution for groundwater protects, which is affected by high fertilizer use, is a proper tool. Groundwater of Urmia Plain due to various factories and agricultural activities, have potential for contamination. In this study, the modified version of the DRASTIC model and the original DRASTIC model, which is a global model, has investigated the inherent vulnerability potential of Urmia groundwater contamination. The correction of this model based on the revising of the ratings and weights of various factors was carried out using simple statistical methods and in the GIS environment, taking into account the correlation with the concentration of groundwater nitrate. The results showed that aquifer environment (A) did not significant correlation with nitrate concentration and was eliminated from the initial equation. The highest and lowest significant correlation was found between soil factors (s) and depth to groundwater (D), respectively, and weighed 5 and 2.7, respectively. The correction of ratings and weights led to improved zoning map, with the correlation of the DRASTIC index with nitrate concentration versus the original DRASTIC, increased by 11%. Based on the modified index of the Urmia Plain, 4.3, 30.8 and 64.9 percent were low, very low and without risk of pollution, respectively.

Keywords

Main Subjects

References

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Iran-Water Resources Research
Volume 14, Issue 5
October 2018
Pages 220-235

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History

  • Receive Date: 13 February 2018
  • Revise Date: 25 July 2018
  • Accept Date: 27 July 2018

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