Rapid assessment method for karst conservation zone delineation in Indonesia

In Indonesia, conflicts of interest between limestone mining and conservation zone in the karst area occurred frequently. The Ministry of Energy and Mineral Resources (ESDM) of Indonesian Republic had stipulated ESDM Ministerial Regulation Number 17/2012 concerning "Karst Conservation Areas". Based on this regulation, the protected karst area is a landscape that has hydrological functions and the uniqueness of eksokarst-endokarst characteristics. However, there is no fixed method for implementing the regulation in Indonesia. This research aims to propose a method for establishing karts conservation zones rapidly and precisely. The study area located in the Karst Karangbolong Area, Kebumen Regency, Indonesia. In this region the community depend on karst springs to meet their clean water needs, the main springs are Kali Sirah and Jumbleng. The research mthod used is water tracing, cave mapping, and field observations carried out for seven days. Injections of uranine and tinopal were carried out on several ponors/sinkholes that are estimated to be connected to both springs. Fluorometer GGUN FL-30 was installed in Kali Sirah Spring while GGUN FL-24 was installed in Jumbleng Spring. Charcoal bags were also installed on several springs around the study area. The field observations consisted of measurements of lineament direction and thickness of the epikarst zone which used to make 3D topography. Conservation zone area was delineated by observing the water tracing direction and 3D topography. Validation of the area was done by calculating the nomogram Todd. Water bility map. Nonetheless, this research can be applied to examine karst conflict areas that require rapid solving.