THE APPLICATION OF NRECA MODEL IN THE RECHARGE AREA OF WAYANG WINDU GEOTHERMAL FIELD, WEST JAVA']JAVA

Geothermal is known as a renewable energy resource and the renewing process occurs in the recharge area. This paper discusses about the meteoric water recharge area for geothermal reservoir and the ratio of baseflow discharge compared with surface runoff discharge based on water balance, i.e. conducting rainfall-runoff of NRECA model simulation in the Drainage River Area (DRA) which is located in the elevation range of recharge area. The interpretation of FFD map and recharge area map resulting from stable isotope analysis shows that there are three high FFD zones interpreted as recharge areas for Wayang Windu geothermal reservoir. Infiltration analysis has been carried out based on water balance and synthetic discharge data for high FFD zone to know the ratio of baseflow discharge and surface runoff discharge in that recharge area. The result of rainfall-runoff simulation by using NRECA model is used to get infiltration coefficient for each DRA. The ratio between baseflow discharge to surface runoff discharge in high FFD zone located in Cisangkuy DRA is higher (98%) than Cilaki DRA (66%) and Citarum DRA (43%). It shows that high FFD zone located in Cisangkuy DRA has higher baseflow discharge than Cilaki DRA and Citarum DRA.