Pemetaan Daerah Resapan Air di Sub Daerah Aliran Sungai (DAS) Bekala

Abstract

This research aimed to map the groundwater recharge areas in the Bekala Sub Watershed using Geographic Information System (GIS). The analysis was conducted based on four main parameters: rainfall, slope gradient, soil type, and land use. The overlay and scoring methods were applied to classify the groundwater recharge conditions into several categories, namely good, naturally normal, starting to be critical, somewhat critical, and critical. In addition, measurements of soil physical properties and infiltration rates were conducted in the field using the Philip method. The research results showed that 82.29% of the Bekala Sub Watershed area was in good condition. The map of groundwater recharge distribution indicated that areas in good condition were widely spread from the southern to parts of the northern region of the Sub Watershed. The highest soil infiltration rate in the Bekala Sub Watershed was 139.04 mm/hour in land unit 8 with dry agricultural land use, while the lowest was 1.82 mm/hour in land unit 7 with residential land use.