The crisis of freshwater has been occurring in the world including Indonesia. Up to now, almost two-thirds of Jakarta’s inhabitants and other big cities of Indonesia still rely on the shallow groundwater individually as source of freshwater. The problem is that they always suffer from drought regularly due to the decreasing water table levels in their surroundings. Precisely, the problem relates with the absence of well-planned urban ecosystem. The condition of shallow groundwater is affected by related factors of population density, land use, and green space elements mainly the urban parks. Through the interpretation of the Qur’ānic verse (an-Naml: 60) and utilisation of the Zalewski’s ‘eco-hydrology’ concept that stresses the relationship between vegetation and hydrology, this study explores water conservation through urban park. The research method covers observation of the urban parks condition in Jakarta and measurement of the soil water status on roots zone beneath the vertical class of vegetation in Ragunan and Pondok Kopi Parks (2004-2005). The study concludes that urban park has ability and suitability to conserve water. The bigger the urban park is the better for water conservation purposes. Regarding with water status as well as roots zone volume of selected species, tree is more valuable for water conservation than shrub, grass, and bare land. Besides, the study introduces the interlinking parks model that connects to green space elements for improving urban ecosystem including groundwater properly. Hence, this study is useful to add the roles of urban landscape planning, water conservation, urban development policy and urban ecosystem. It is also academically worthy of support since it could help disseminate ideas on Islamisation of knowledge. Keywords: urban ecosystem, water conservation, ecohydrology, urban park, and roots zone.