Use modified DRASTIC method in semi-arid area to make vulnerability assessment for groundwater resource, and I will use diffrent scale maps like soil map with scal 1:2000000, Geologic map 1:500000 to recognize Vadose Zone, no hydraulic conductivity map,I will add Land Use map. I need help to make this study correctly.
Hi
Take a look at my paper entitled "Modelling nonpoint source pollution by nitrate of soil in the Mateur plain, northeast of Tunisia"
https://www.researchgate.net/publication/260434813_Modelling_nonpoint_source_pollution_by_nitrate_of_soil_in_the_Mateur_plain_northeast_of_Tunisia?ev=prf_pub
Article Modelling nonpoint source pollution by nitrate of soil in th...
Usually the modified DRASTIC done by adding the land use factor to the final DRASTIC map. Land-use map will have a specific rate and wight
I suggest you should refer to the work carried out in NSW, Australia by my former department (Dept of Land and Water Conservation).
I used DRASTIC analysis as part of my Masters minor thesis. One of the fundamental flaws in DRASTIC is that it does not consider the water quality of the receiving waters. I had to modify my DRASTIC process to include water quality. I believe that DRASTIC needs a major overhaul to include water quality as part of the assessment process.
The references provided above are good enough to give you a guide. However, the major determinant of using DRASTIC or any Vulnerability assessment method is the parameters. How many of these parameters do you have available to you based on your area of investigation? DRASTIC is not adaptable in all situation and environments. Based on what data you have you could develop your own method. There are very simplified forms of vulnerability assessment that do work out well in certain environemtn, even though they tend to be old-fashioned. I will suggest you have a read of available methods and compare based on what you have and need?
All the best!
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