GEOELECTRIC METHODS FOR GROUNDWATER EXPLORATION IN THE FOOD ESTATE AREA OF CENTRAL SUMBA REGENCY, EAST NUSA TENGGARA, INDONESIA

D A Dayani^1,2, W Wilopo^1*, I Azwartika²

¹Department of Geological Engineering, Faculty of Engineering, Gadjah Mada University, Yogyakarta 55281, Indonesia

²Ministry of Public Works and Housing, Indonesia

[1]^* Corresponding author’s email:  [email protected]

DOI: https://doi.org/10.20885/icsbe.vol2.art12

ABSTRACT

Groundwater is one water source to meet the needs of humans, animals, and plants. The groundwater potential of an area is usually difficult to determine because it is below the ^[1]surface. The Indonesian government has a program to develop a food estate in Central Sumba Regency; however, the availability of surface irrigation water is limited. Therefore, the assessment of groundwater potential was conducted. In this study, the evaluation of groundwater potential was carried out using geophysical methods and a hydrogeological survey. The resistivity of subsurface rocks was measured in 20 VES points by Schlumberger configuration. The area of the food estate in Central Sumba is mainly composed of limestone that forms a karst landscape. The groundwater level from the existing well is around 2-16 meters from the surface. The potential of rock as an aquifer is limestone with a resistivity value between 34 -7013 Ωm. There are two types of aquifers in the study area: unconfined and confined aquifers. Unconfined aquifers are found at a depth of 2-7 meters, while confined aquifers are found at depths of 11-120 meters. The distribution of aquifers is more in the western part of the study area.

Keywords : Geolectrical Methods; Groundwater; Food Estate

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