GIS – BASED DRASTIC MODEL FOR ASSESSING THE VULNERABILITY OF GROUNDWATER AQUIFERS

TO POLLUTION SOURCES

DRASTIC MODEL PARAMETERS

Depth to water net Recharge Aquifer media Soil media Topography vadose zone Conductivity

DRASTIC

Weight Rate

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DRASTIC MODEL PARAMETERS & INDEX

Depth to water:

Depth to water – Model Layer

Net Recharge

Net Recharge – Model Layer

Aquifer media

Aquifer media – Model Layer

Soil media

Soil media – Model Layer

Topography

Topography – Model Layer

Impact of vadose zone

Vadose zone – Model Layer

Conductivity

Hydraulic Conductivity– Model Layer

MODEL RESULTS

Vulnerability to Contamination in General

MODEL RESULTS

Vulnerability to fertilizers