An estimation of water economic value of the karst area of Jonggrangan (case study: Catchment area of Mudal, Kiskendo, and Anjani Caves)

The Jongggrangan Karst Area is one of the karst areas whose potential data inventory has not been well studied through studies of spatial and temporal variability. Research on the potential economic data of the Jongggrangan Karst Area is useful as a basis for making decisions on the management. The objectives of this study are: 1) to know the availability of water in the Jongggrangan Karst Area; 2) to know the estimated economic value of water that can be produced by the Jonggrangan karst Region. The primary data used is flowrate as measured by the velocity area method, and water level data along with rainfall recorded automatically by a logger. Secondary data used are water price data obtained from relevant agencies. The results of the study indicate that the study area has abundant resource potential. The availability of water in the study location reached 23,825,512.4 m3/year from the Mudal Cave spring and the underground river of Kiskendo Cave and Anjani Cave. The value of the availability of water produced is able to meet the needs of water for a decent human life of 14,890 people per year and with an economic value of IDR 47,651,024,980.00 per year.