The process of injecting
contaminants and waste material into confined aquifers
for waste disposal.
In order for this process to be safe, the following parameters are needed for the region:
-the presence of a confining layer which would prevent the migration of wastes into groundwater flow.
-an injection zone of high permeability to receive the wastes.
-poor-quality water within the aquifer (thus, the aquifer can't be used for anything else.
Unfortunately, it is hard to determine whether an aquifer is completely confined and upward seepage
of wastes can occur causing groundwater contamination
Adapted from Hydrology: An Environmental Approach
by Watson and Burnett.