Delineation of Groundwater Potential Zones Using Remote Sensing, GIS, and AHP Techniques in the Southern Region of Banjarnegara, Central Java, Indonesia

摘要

Southern region of Banjarnegara Regency, Central Java, Indonesia have been experiencing water scarcity throughout dryseason every year due to meteorological and geological condition. Meteorological drought in dry season have beenrecorded since 1984. About 85,000 people are affected. Local authorities were forced to send clean water aid routinely.This study aim to delineate groundwater potential zones using remote sensing, Geographical Information System (GIS),and Analytic Hierarchy Process (AHP). This study evaluate groundwater potential zones using 5 factors involvinglineament, lithology, slope, drainage, and rainfall. Digital Elevation Model (DEM) from DEMNAS (published byIndonesian Geospatial Agency) was used to generate lineament delineation and slope map. Hydrography data providedby Indonesian Geospatial Agency was used to generate drainage density. Geological maps which were generated fromremote sensing interpretation were provided from Geological Survey Center of Indonesia. Rainfall data were provided byBPS-Statistics of Banjarnegara. 52 springs and 2 bore wells data were used for result validation. All 5 thematic layerswere prepared in GIS. All factors and its classes were assigned weights using AHP techniques and normalization ofweights was conducted through the AHP. Groundwater potential zones map were generated, the results was classifiedinto five zones as very high, high, moderate, low, and very low. The zones covered of 1.02 km~2 (1.18%), 14.49 km~2(16.80%), 33.65 km~2 (38.99%), 37.12 km~2 (43.02%), and 1529 m~2 (0.00%) of study area respectively. Result validationby comparing the AHP map values with discharge of springs and bore wells showed promising result.