Underground river resources potential in Gunungkidul regency for drinking water

Gunungkidul has the potential for raw water from underground rivers with a discharge reaching 1,000 lps. This river is in the middle zone of Gunungkidul Regency and has not been used optimally. This study aims to analyze the condition of water supply in Gunungkidul Regency and to plan the development of water supply in Gunungkidul Regency. The methods used in this study include direct measurement, surveys, and interviews. From the analysis it was found that the available underground river discharge capacity in Gunungkidul Regency was 5,756 lps, while the water demand for each district after accumulation was 4,030 lps. The difference between the available discharge capacity and the water needs of Gunungkidul Regency is 1,726 lps. Furthermore, The discharge capacity of 5,050 lps has not been utilized in Gunungkidul Local Water Company. To reduce the difference in discharge capacity, a regional drinking water supply system originating from the Gunungkidul Regency can be made for several districts in the Special Region of Yogyakarta.