Abstract
The karst area in Panggang Subsystem, Gunungsewu has specific hydrogeological properties, including predominant epikarst springs with minimal discharge in dry seasons. Since this situation inevitably leads to drought, the installation of deep wells to extract water from deep aquifers is proposed as an alternative solution to water provision. This study determined the location of these wells using general geological and geomorphological surveys, followed by analyzing the results of geophysical measurements. The results showed potential aquifers in the sand layer of tertiary volcanic aquifers under the limestone formation that makes the karst region. Although three borewells were constructed at three different points, only two of them succeeded and are ready for use to meet the clean water needs of the population at the research site.
Highlights
Gunungsewu Karst, located in Gunungkidul Regency, the Special Region of Yogyakarta, Indonesia, has six main hydrogeological subsystems, namely Panggang, Ponjong, Bribin-Baron, Pracimantoro-Wuryantoro, Donoharjo-Pringkuku, and Sadeng Subsystems [1] (Figure 1)
Panggang Subsystem is one of the hydrogeology blocks that have serious problems related to water resources, limited clean water quantity [2, 3]
Some of the springs in this subsystem are categorized as epikarst spring with low potential, while the rest is contact springs, emerging due to contact with the underlying tertiary volcanic rock [3]
Summary
Gunungsewu Karst, located in Gunungkidul Regency, the Special Region of Yogyakarta, Indonesia, has six main hydrogeological subsystems, namely Panggang, Ponjong, Bribin-Baron, Pracimantoro-Wuryantoro, Donoharjo-Pringkuku, and Sadeng Subsystems [1] (Figure 1). Panggang Subsystem is one of the hydrogeology blocks that have serious problems related to water resources, limited clean water quantity [2, 3]. Aside from the absence of a sizeable underground system, the lack of water resources is caused by the hydrogeological conditions of the area where springs with relatively small discharge prevail and sparsely spread along the outer boundary of the limestone formation [4]. Panggang Block has low groundwater potential [5]. This hydrogeological subsystem has a moderately productive aquifer whose groundwater flow is limited to fissure, fracture zone, and solution channels [6]. The underground river system and karst passage fall into the category of undeveloped [4]
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