An Aquifer Vulnerability Assessment of the Paluxy Aquifer, Central Texas, USA, Using GIS and a Modified DRASTIC Approach |
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Authors: | Todd G Fritch Cleavy L McKnight Joe C Yelderman Jr Jeff G Arnold |
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Institution: | (1) Baylor University, Department of Geology, P.O. Box 97354, Waco, Texas 76798-7354, USA , US;(2) Agricultural Research Service, Grassland Soil and Water Research Laboratory, 808 East Blackland Road, Temple, Texas 76502, USA , US |
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Abstract: | D epth to water, net Recharge, Aquifer media, Soil media,
Topography, Impact of the vadose zone, and
Conductivity of the aquifer). Using such an approach allows one to investigate the potential for groundwater contamination
on a regional, rather than site-specific, scale. Based upon data from variables such as soil permeability, depth to water,
aquifer hydraulic conductivity, and topography, subjective numerical weightings have been assigned according to the variable's
relative importance in regional groundwater quality. The weights for each variable comprise a GIS map layer. These map layers
are combined to formulate the final groundwater pollution potential map. Using this method of investigation, the pollution
potential map for the study area classifies 47% of the area as having low pollution potential, 26% as having moderate pollution
potential, 22% as having high pollution potential, and 5% as having very high pollution potential. |
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Keywords: | : Aquifer Vulnerability assessment Groundwater DRASTIC Pollution potential GIS |
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