Identification of the Aquifer Type to Determine the Location of Groundwater Drilling in Karangsari Village, Kulonprogo Regency, Special Region of Yogyakarta

Abstract

Kulonprogo Regency is area that have an existing problem with clean water resource. This water resource distribution influed by the rock formation of this area and can be overcome with developing groundwater source. This research was conducted with the aim of determining the location of groundwater drilling that can meet the availability of clean water for the area. The method used is geoelectrical measurement using the Schlumberger method, by Vertical Electrical Sounding (VES) method. The best drilling point is at KP 05.3 with aquifer resistance value is 20.20 ohm-m at a dept of 53-70 m and 41.9 ohm-m at a dept of 90-115 m. The aquifer is composed of volcanic sandstone lithology. Each drilling point is measured by three geoelectric points, obtained an error rate of 10% and an accuracy of 90%.