Groundwater vulnerability and pollution risk assessment of porous aquifers to nitrate: Modifying the DRASTIC method using quantitative parameters

Background: In the Azna-Aligudarz plain, the drinking water is mainly supplied from groundwater. Therefore, it is necessary to estimate the concentration of nitrate and nitrite and determine the groundwater vulnerability potential and related risks in the plain to guarantee the health of consumers. Materials and Methods: The vulnerability potential of the studied plain to pollutants was investigated by the drastic method. To estimate the concentration of nitrate and nitrite, 25 water wells in the study area were sampled within 2018-2019 and analyzed by standard method. Human health risk related to groundwater in the study area was assessed using the USEPA (the United States Environmental Protection Agency) index. Results: The results of the DRASTIC method demonstrated that 45% and 65% of the region has a high (southern part of the plain) and a medium vulnerability potential (northern part of the plain), respectively. According to the obtained results, nitrate in Chaqataram and Ashrafabad villages with 56 and 65 mg/liter, respectively, and nitrite in groundwater of Chamzaman, Aliabad, and Darreh Bagh villages with 3.5, 3.3, and 3.4 mg/liter, was higher than the standard of World Health Organization. According to the health risk assessment results, 83%, 8%, and 4% of children, women, and men are prone to health threats due to nitrate concentration (HQ>1). The accuracy of the vulnerability results was confirmed by calibrating the results of the health risk assessment and the results of the nitrate map. Conclusion: As e evidenced by the obtained results, improper use of nitrate chemical fertilizers and unsafe disposal of human wastewater (urban and rural) is the main cause of increased nitrate and nitrite concentrations in agricultural lands. Based on the results of the present study, the use of contaminated drinking wells is not recommended and continuous monitoring of drinking wells in the study area is essential to protect the health of consumers, especially children.

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Groundwater pollution risk in Africa (2016)

10.29104/wins.l.0005.2018 ◽

2017 ◽

Author(s):

Chloé Meyer

Keyword(s):

Land Use ◽

Land Cover ◽

Groundwater Pollution ◽

Additive Model ◽

Soil Surface ◽

Groundwater Vulnerability ◽

Land Use Land Cover ◽

Pollution Risk ◽

Vulnerability Model ◽

Drastic Method

Groundwater pollution risk is determined both by the intrinsic vulnerability of the aquifer and the existence of potentially polluting activities at the soil surface. This raster has a resolution of 15*15 km. It was generated by combining a groundwater vulnerability model (based on the DRASTIC method) with land use/land cover (from the GlobCoverdatat set) using an additive model. Exposure Groundwater Pollution Risk

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Research on GIS-Based Risk Assessment Method of Groundwater Pollution and its Application

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.819 ◽

2011 ◽

Vol 356-360 ◽

pp. 819-824 ◽

Cited By ~ 1

Author(s):

Li Ping Bai ◽

Ye Yao Wang ◽

Fa Sheng Li

Keyword(s):

Risk Assessment ◽

Groundwater Pollution ◽

Pollution Prevention ◽

Groundwater Vulnerability ◽

Assessment Method ◽

Pollution Sources ◽

Assessment Model ◽

Multi Index ◽

Pollution Risk ◽

Risk Assessment Method

The risk assessment model and parameter system of groundwater pollution were established in this paper. The multi-index evaluation method of groundwater pollution sources was proposed, and the GIS-based risk assessment method of groundwater pollution was produced in comprehensive consideration of groundwater vulnerability and groundwater pollution sources. The multi-index method suggested in this paper was used in the risk assessment of groundwater pollution at a plain area of a big city in North China, and the different grades of groundwater pollution risk were computed. The evaluation results show that the groundwater pollution risk is determined by the combined action of ground pollution sources and groundwater vulnerability. The established risk assessment method of groundwater pollution could give a scientific support for the regional groundwater pollution prevention and control planning.

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