Semarang, as one of the coastal cities in the central north of Java Island, is growing fast, in particular in the industrial and commercial sectors. From a regional development perspective, the position of Semarang is of high strategic value for the economic activities not only for the central of north Java Island, but also for Jakarta as the capital city of Indonesia.The dynamic condition in Semarang is triggering the increase of economic development for surrounding areas such as from Pekalongan in the west to Demak in the east. It then leads the demand for clean water primarily from groundwater for domestic and industrial purposes, increasing continually in line with the population growth. The increasing exploitation of groundwater affects some environmental problems such as declining groundwater levels, land subsidence, seawater intrusion, and flooding.Thus, there is an urgent need to give quantitative and qualitative assessments to the actual situation of groundwater at the coastal cities in the central north of Java Island. This will be a platform as a tool in order to manage groundwater in the coastal cities for more than one groundwater basins. This three years project aims at:
a. Calculating groundwater recharge modelling based on GROWA model, empirical methods, and environmental isotopes.
b. Defining groundwater age and hydrochemistry analyses.
c. Simulating current conditions on groundwater flow and sea water intrusion and future impacts.