Modification of the DRASTIC Framework for Mapping Groundwater Vulnerability Zones

Barzegar, Rahim; Moghaddam, Asghar Asghari; Norallahi, Shahrokh; Inam, Azhar; Adamowski, Jan; Alizadeh, Mohammad; Nassar, Jessica Bou

doi:10.1111/gwat.12919

Cited by 34 publications

(8 citation statements)

References 32 publications

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“…Among the latter, the DRASTIC model [11], is the most used method worldwide to evaluate the intrinsic vulnerability of porous aquifers: it uses a lot of applications and modifications (e.g., the recent [12,13]). The AVI (Aquifer Vulnerability Index) method [14] was developed a few years after DRASTIC, utilizes the potential offered by GIS systems, and has also been widely used because it has the advantage of using only two physical parameters.…”

Section: Introductionmentioning

confidence: 99%

A Modified AVI Model for Groundwater Vulnerability Mapping: Case Studies in Southern Italy

Ducci

Sellerino

2022

Water

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Many methods for evaluating the aquifer’s vulnerability to pollution have been developed in the past four decades by using geographic information system (GIS) tools. However, even if the aquifer vulnerability concept is well defined and the methods have been constantly tested and compared, the problem of the choice of the best “standard” method remains. To meet these objectives, aquifer vulnerability maps are of crucial importance. The choice of method depends on several factors, including the scale of the project, the hydrogeological characteristics of the area, and data availability. Among the many methods, the AVI (Aquifer Vulnerability Index) method has been widely used as it considers only two physical parameters. The AVI Index represents the hydraulic resistance of an aquifer to vertical flow, as a ratio between the thickness of each sedimentary unit above the uppermost aquifer (D, length), and the estimated hydraulic conductivity (K, length/time) of each of these layers. The AVI Index has a time dimension and is divided into five classes. In order to avoid a widespread presence of the higher vulnerability classes, especially in shallow aquifers, the AVI classification has been modified using statistical methods. The study reports the application of the modified AVI method for groundwater pollution vulnerability, in three different areas of southern Italy, highlighting the limitations of the method in alluvial aquifers and the differences with other methods.

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Section: Introductionmentioning

confidence: 99%

A Modified AVI Model for Groundwater Vulnerability Mapping: Case Studies in Southern Italy

Ducci

Sellerino

2022

Water

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“…Vulnerability of groundwater to pollution is a characteristic that cannot be directly measured on field but is a concept formulated on the principle that some land areas are to a greater extent prone to groundwater pollution than other areas (Barzegar et al, 2016;Barzegar et al, 2019). There is no standardized definition for groundwater vulnerability.…”

Section: Introductionmentioning

confidence: 99%

Ground Water Vulnerability Assessmentof Kodoor River Basin by Integrated Drastic Method

Simi¹,

K²,

Varghese³

et al. 2022

YMER

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Groundwater vulnerability assessment techniques are useful tools in groundwater management. The purpose of the study is to assess the groundwater vulnerability of Kodoor river basin in Kerala by DRASTIC model and to modify the model to suit the regional scale by incorporating the land use and/ or land cover (LULC) pattern of the area of study in it to produce DRASTICA model. The interdependence of the nitrate concentration data and vulnerability indices from DRASTIC and DRASTICA models were calculated. Correlation coefficient values obtained for DRASTIC and DRASTICA model is 0.21 and 0.38 respectively which shows that the modified DRASTICA model suits the study area better. The study area was grouped into three zones based on the grades of vulnerability. The study also includes the sensitivity analysis of the DRASTICA model. The map removal sensitivity analysis and single parameter sensitivity analysis were carried out to validate the model results.

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“…Several authors have improved the method by modifying those seven parameters and their weights by estimating land use's effect on the NO3 content in groundwater (Panagopoulos et al 2006;Huan et al 2012;Neshat et al 2014a; Kazakis and Voudouris 2015;Barzegar et al 2019b).…”

Section: Introductionmentioning

confidence: 99%

Modified DRASTIC method for groundwater vulnerability assessment in areas with diverse Quaternary deposits

Männik

Karro

Marandi

et al. 2022

Preprint

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Developing accurate groundwater vulnerability maps is necessary for environmental planning and protection of groundwater resources. The DRASTIC method is one of the most widely used groundwater vulnerability assessment techniques. To achieve a more precise vulnerability estimation in areas where aquifers are covered with an extra layer of diverse sediments and thus, have more complex hydrogeology, e.g. in formerly glaciated regions, a further modification of the DRASTIC method is required. In such areas, the thickness of deposits can vary from thin layers with a high pollution potential to thick Quaternary layers making the groundwater protected against contamination. Therefore, the purpose of this study is to modify the DRASTIC method to be successfully applied in the areas characterized by a layer of diverse Quaternary sediments, which remarkably influence the nature of the infiltration conditions. First, the D-, S-, and I-parameters were modified, considering the nature of the Quaternary layer. To help the process, a model was created, which takes as input all necessary files for vulnerability assessment and creates a map using all parameters with weights assigned to them. Later, both the original and the modified DRASTIC methodology was applied in an area with glacial sediments located in Central Estonia. For the validation of methods, the comparison of results from existing vulnerability maps, which were produced by methodology specifically developed for local geological conditions, was used. In conclusion, the results generated by the modified DRASTIC method showed significantly more similarities with the existing maps than the original DRASTIC method. Thus, the modified DRASTIC method is successfully applicable in areas where the aquifer is covered with an extra layer of diverse Quaternary sediments.

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Modification of the DRASTIC Framework for Mapping Groundwater Vulnerability Zones

Cited by 34 publications

References 32 publications

A Modified AVI Model for Groundwater Vulnerability Mapping: Case Studies in Southern Italy

A Modified AVI Model for Groundwater Vulnerability Mapping: Case Studies in Southern Italy

Ground Water Vulnerability Assessmentof Kodoor River Basin by Integrated Drastic Method

Modified DRASTIC method for groundwater vulnerability assessment in areas with diverse Quaternary deposits

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