Improved DRASTIC method for assessment of groundwater vulnerability to generic aqueous-phase contaminants

Jovanović, Nebojša; Adams, Shafick; Thomas, A. P.; Fey, M. V.; Beekman, H.E.; Campbell, Ron; Saayman, Irené; Conrad, Julian

doi:10.2495/wm060421

Cited by 8 publications

(3 citation statements)

References 18 publications

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“…To our knowledge, no other landscape level studies were conducted in western Africa to quantify the fraction of agricultural areas vulnerable to leaching or runoff of a specific pesticide. For example, Jovanovic et al [15] and Thioune et al [16] used GIS overlay methods such as SI or DRAS-TIC to assess groundwater vulnerability across the entire landscape but did not refine it to areas where applications may occur or adapt the method for a product specifically. As with any GIS assessment, availability of suitable datasets is a requirement.…”

Section: Discussionmentioning

confidence: 99%

“…Sustainability Index (SI) is a modification of DRASTIC which includes a factor to account for land use cover [16]. Another improved DRASTIC model was developed to assess contaminants under specific South African environmental conditions [15]. Likewise, a more advanced GIS-based approach using weighted-overlay analysis using the SINTACS https://doi.org/10.1371/journal.pone.0230990.g013…”

Section: Plos Onementioning

confidence: 99%

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Assessment of acetochlor use areas in the sahel region of Western Africa using geospatial methods

et al. 2020

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The goal of this study was to determine the co-occurrence between acetochlor use on crops and potentially vulnerable soils in the Permanent Interstate Committee for Drought Control in the Sahel region of Western Africa. Acetochlor, a pre-emergence herbicide, is used primarily on row crops and has the potential to reach groundwater or surface water following a rain event shortly after application. Off-field transport is often determined by soil properties; therefore, soils within potential use areas were assessed and mapped to establish areas with soils vulnerable to leaching and/or runoff. Corn and cotton production areas were used as surrogate crops for high potential use areas of acetochlor within areas identified using GlobCover land use data and the Spatial Production Allocation Model agricultural statistics data. The geospatial analysis identified approximately 462 million ha of potentially vulnerable soils in the Sahel region of which 65.7 million ha are within agricultural areas. An adjustment for corn and cotton production areas showed that 2.2 million ha or 3.3% of agricultural fields could have potential restrictions for acetochlor use. Approximately 0.159 million ha of soils or 0.24% of agricultural fields are in the presence of shallow groundwater, defined by depth < 9 m. In addition, 0.0128 million ha or 0.02% were determined to be adjacent to surface water bodies. To understand the uncertainty associated with the use of specific land cover datasets, an overlay assessment was conducted using alternative data sources. Overlap between selected land cover datasets in the Sahel region varies and ranges from 24.7% to 75.5% based on a merged 2009 GlobCover and CCI LC datasets. In comparison with the merged 2005 and 2009 GlobCover dataset, the cropland overlaps range from 38.9% to 85.0%. This demonstrates that the choice of land cover dataset can have a significant impact on a spatial assessment. Results from this assessment demonstrate that only a small fraction of vulnerable agricultural soils across the region may be a risk for contamination by acetochlor of groundwater or surface resources, based on product label

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Section: Discussionmentioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

Assessment of acetochlor use areas in the sahel region of Western Africa using geospatial methods

et al. 2020

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“…The envelopes allowed the property most restricting sorption to be determined for any soil and also the range of each property to be divided into three classes providing a relative ranking of each soil material. The way the classification works is described in Jovanovic et al (2006) and Saayman et al (2007) and is illustrated with example input data in Table 1.…”

Section: Contaminant Threat To Groundwatermentioning

confidence: 99%

Environmental envelopes — identifying limits affecting ecosystem management after mining

Fey¹,

Mills²

2009

Proceedings of the International Conference on Mine Closure

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Environmental envelopes are so named because they depict how parameters of interest are shaped by their environment. They are boundary lines separating the observed world from an imaginary one. Quantile regression enables us to determine their position objectively. Once located, the envelope enables us to separate the range(s) of a determinant variable over which some variable of interest (relating to biological performance, for example) is inevitably minimal from the range over which it is potentially at its maximum value. Thus, in ecosystem management, which is critical to the sustainability of land use after mine closure, we can identify ways in which plant cover and species diversity are affected by environmental variables such as soil infiltrability even under conditions when other determinants are not kept constant. Recognising this paradigm allows restoration ecologists to reduce their dependence on factorial field experiments for discovering suitable methods of mine site rehabilitation. It is also applicable to discovering relationships between abiotic variables in large data sets, such as that between routinely measured soil properties and ones which are not readily determined but of which knowledge is critical in determining appropriate restoration practices after mining. If combined with the diagnosis and recommendation integrated system (DRIS) principles and enough spade work to build a reliable and comprehensive database, it could revolutionise management by generating norms in terms of which the factors affecting ecosystem function can be ranked in order of limiting importance.https://papers.acg.uwa.edu.au/p/908_Fey/

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A GIS-based DRASTIC model for assessing groundwater vulnerability in hard rock granitic aquifer

2014

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Improved DRASTIC method for assessment of groundwater vulnerability to generic aqueous-phase contaminants

Cited by 8 publications

References 18 publications

Assessment of acetochlor use areas in the sahel region of Western Africa using geospatial methods

Assessment of acetochlor use areas in the sahel region of Western Africa using geospatial methods

Environmental envelopes — identifying limits affecting ecosystem management after mining

A GIS-based DRASTIC model for assessing groundwater vulnerability in hard rock granitic aquifer

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