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The research is focused on the urban City of Yogyakarta. This location is the most densely populated with the highest number of population in the southern flank of Merapi Volcano, with the consequence of the highest water requirement. The southern flank of Merapi Volcano is an area with very high intensity of precipitation, however declining of groundwater table has occurred for quite of years with an intensive rate. It is therefore, groundwater conservation effort is required in the urban city of Yogyakarta. This research is aimed at; 1) making a hydrology spatial model to understand the water balance based on landform approach on the research area; 2) to find the area suffering from water scarcity and when the scarcity occurs; and 3) recommendation on groundwater conservation effort to overcome the water scarcity. The methods applied are to make a spatial model of the research area based on landforms, river interfluves, water availabilty analysis, water balance analysis to find where and when the scarcity occurs, and the analysis for water conservation. The research area is naturally divided into 12 unit areas based on landforms and interfluves. The analysis has shown the unit areas when and where the water scarcity occur using water requirements of 120 liter/capita/day and 50 liter/capita/day. The proposed conservation effort is applying rainstorm management that rain water shall be considered as water resources not flood or standing water to be drained away, and keep the hydrologic function of the area remains unchanged after a development. A spatial model is constructed on the most seriously suffered unit area which is divided into microcatchments. A microcatchment is a single hydrology unit having independent drainage system, where efforts on the unchanged hydrology functions are implemented and analyzed..

Spatial Model for Ground Water Conservation Based on Landform Approach in the Southern Flank of Merapi Vulcano