Zoning of aquifers vulnerability by modified DRASTIC technique for landfill site selection;
Case study: Eastern of Iran
Ali Vosoogh, Akbar Baghvand, Abdolreza Karbassi
Nowadays, with the ever-increasing growth of the population and the development of various industries, we are experiencing an increase in environmental problems, resulted from man–made contaminants (such as urban solid wastes, wastewater, etc).
Generally, the ease of the exposure of groundwater to aquifers is determined by the vulnerability of these waters. The vulnerability assessment is a process through which we can distinguish those areas with the lower vulnerability from the ones with the higher vulnerability.
Hydro geological parameters which are effective in polluting ground waters and also presented in Modified DRASTIC model involve: Depth to groundwater surface (D), Recharge (R), Soil media (S), Topography (T), Impact of vadose zone (I), Conductivity of aquifer Hydraulic (C), the effect of Land use activity(L).
DRASTIC originally developed for manual overlay of semi quantitative data layers. However, the simple definition of its vulnerability index as a linear combination of factors shows the feasibility of the computation using GIS.
RS (remote sensing) and GIS (geographic information system) are of great significance.
This study aims at zoning the pollution potential of Mashhad aquifer by using the Modified DRASTIC method and GIS software in order to locate and select some new landfill sites as well as to assess the previous existing ones.
The results show that new and existing landfill sites for solid waste disposal in Mashhad site selections were wrong, while they are located in high vulnerability zones and where the risk of groundwater pollution is high.
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