Reduction of Groundwater Extraction
In the Greater Jakarta area, metropolitan authorities and technical agencies are advocating the reduction of groundwater extraction in vulnerable areas by completely phasing out the use of groundwater and taxing groundwater consumption.
This should include the development of alternative water supplies for large industrial users or relocation of large groundwater users, outside the ‘critical zones’. The number of ‘unregistered’ users is still a problem. To some extent, spatial planning measures were applied to avoid subsidence-prone areas, but rapid growth of informal settlements has made many of these plans obsolete. Recently, the Jakarta Coastal Defense Strategy (JCDS) programme integrated the results of various subsidence studies and tried to obtain reliable figures of current and future subsidence. This subsidence prognosis is regarded as an extremely vital component for an integrated flood management and coastal defense strategy