Factors/hydrological settings


Relative weights

Depth to water

It is depth from ground to water table, deeper

the water table lesser will be the chances of

pollutants to interact with groundwater.


Net Recharge

It is the amount of water/unit area of land that penetrates the ground surface and reaches the water table, it is the reporting agents for pollutants to the groundwater.


Aquifer media

It is the potential area for water storage, the contaminant attenuation of aquifer depends on the amount and sorting of fine grains, lower the grain size higher the attenuation capacity of aquifer media.


Soil media

Soil media is the uppermost and weathered part of the ground, soil cover characteristics influence the surface and downward movement of contaminants.



it refers to slope or steepness, areas with low slope tend to retain water for longer, this allows a greater infiltration of recharge of water and a greater potential for contaminant migration and vulnerable to ground water contamination and vice versa.


Impact of vadose zone

It is the ground portion found between the aquifer and the soil cover in which pores or joints are unsaturated, its influence on aquifer pollution potential similar to that of soil cover, depending on its permeability, and on the attenuation characteristics of the media.


Hydraulic Conductivity

It refers to the ability of the aquifer formation to transmit water; an aquifer with high conductivity is vulnerable to substantial contamination as a plume of contamination can move easily through the aquifer.