Characterization and Management of Karst Drainage System: Based on Kars Hydrograph Analysis in Gunung Sewu Karst Area

This study was conducted in Gunung Sewu karst area, focused on several sampling locations which are Gilap Cave, Beton Spring, Bribin Underground River, Ngreneng Underground River, and Kakap Spring. The objectives of this study are: (1) to determine the characteristics of recession curves from several karst springs and groundwater rivers in Gunung Sewu karst area; (2) to assess the karstification degree of several karst springs and groundwater rivers within Gunung Sewu Karst; (3) to evaluate the physical conditions of karst drainage system in Gunung Sewu Karst Area based on the karstification degree for karst water resources management. The primary data of hydrograph data series obtained from automatic water level data logger and field measurements. The secondary data were obtained from several previous research, such as hydrograph data and the physical condition of the catchment areas for each sampling location. From the hydrograph data series of each location, several single flood events were identified and analyzed. The single recession curve then assembled to generate Master Recession Curve (MRC).