摘要：In southeastern Bangladesh, where water quality in the upper aquifers is a serious constraint, future
development will likely be confined to deep fresh groundwater. Owing to the importance and
pervasive use of deep groundwater, the sustainability of water use has received extensive attention.
However, excessive extraction from deep aquifers may pose a threat to the storage as well as the
quality of water due to the high susceptibility to salinization and arsenic contamination from upper
aquifers. Hence, determining the extension of aquifer units and the characterizing aquifer sediments
are very important to ensure sustainable development and management of limited fresh groundwater
resources. The study area extends over six districts of the southeastern coastal region of Bangladesh.
In order to assess and monitor deep fresh groundwater potential in the study area, aquifer pumping
tests were performed at six locations with up to 72 h of constant-discharge prior to recovery. Different
methods were used to analyze the drawdown and recovery data considering aquifers as confined
or leaky-confined. Based on transmissivity values it was found that the studied deep aquifers have
moderate to high potential for potable water supply. However, this deep fresh groundwater may not
be safe for a longer period where upper aquifer units contain saline groundwater and where there is
no significant aquitard encountered above or below the deep aquifer. Irrigation extraction of the deep
groundwater is not recommended.
关键词：Deep groundwater
Aquifer pump test
Saline water encroachment
Safe yield
Confined aquifer
