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Hydrogeology Journal

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01-09-2006

Optimization of the DRASTIC method for groundwater vulnerability assessment via the use of simple statistical methods and GIS

Authors: G. P. Panagopoulos, A. K. Antonakos, N. J. Lambrakis

Published in: Hydrogeology Journal | Issue 6/2006

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Abstract

The assessment of groundwater vulnerability to pollution has proved to be an effective tool for the delineation of protection zones in areas affected by groundwater contamination due to intensive fertilizer applications. By modifying and optimizing the well known and widely used DRASTIC model it was possible to predict the intrinsic vulnerability to pollution as well as the groundwater pollution risk more accurately. This method incorporated the use of simple statistical and geostatistical techniques for the revision of the factor ratings and weightings of all the DRASTIC parameters under a GIS environment. The criterion for these modifications was the correlation coefficient of each parameter with the nitrates concentration in groundwater. On the basis of their statistical significance, some parameters were subtracted from the DRASTIC equation, while land use was considered as an additional DRASTIC parameter. Following the above-mentioned modifications, the correlation coefficient between groundwater pollution risk and nitrates concentration was considerably improved and rose to 33% higher than the original method. The model was applied to a part of Trifilia province, Greece, which is considered to be a typical Mediterranean region with readily available hydrogeological and hydrochemical data.

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Title: Optimization of the DRASTIC method for groundwater vulnerability assessment via the use of simple statistical methods and GIS
Authors: G. P. Panagopoulos
A. K. Antonakos
N. J. Lambrakis
Publication date: 01-09-2006
Publisher: Springer-Verlag
Published in: Hydrogeology Journal / Issue 6/2006
Print ISSN: 1431-2174
Electronic ISSN: 1435-0157
DOI: https://doi.org/10.1007/s10040-005-0008-x

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