Groundwater Potential in the Serang - Tangerang Groundwater Basin Based on the Groundwater Balance Method

Abstract

Groundwater u in an area, region or groundwater basin (GB) needs to consider various aspects, especially technical
aspects related to the existence and potential availability of groundwater in that unit area. The existence of groundwater
describes where groundwater is stored and distributed in an aquifer system, including the dimensions of the
aquifer system and its hydraulic properties; meanwhile, groundwater availability includes the quantity and quality
of groundwater in the aquifer system. For the use of groundwater to be carried out sustainably, the balance between
groundwater availability and groundwater use needs to be maintained within a safe limit, meaning that the use of
groundwater does not hurt either the condition or the environment of groundwater. The balance between the two
which is known through the calculation of the groundwater balance provides an overall picture of the components of
groundwater that enters and the component of groundwater that exits an aquifer system. The calculation results for
the Serang-Tangerang GB groundwater balance show that the discharge of free groundwater utilized in the 2020-
2021 period is around 60% of the recharge discharge, so it is in the category between safe and critical. Meanwhile,
the use of groundwater in confined aquifer systems during these two periods was greater than the flow rate so it was
included in the damaged category