Identification of the critical level of water recharge area in the Citarik subwatershed

Abstract

The Citarik sub-watershed is part of the upstream Citarum watershed which has an area of 22.637.83 ha. This sub-watershed has upstream in the Buru Kareumbi Masigit Forest Conservation Area in Sumedang Regency and empties into the Citarum River in the Bandung Regency area. Land-use changes due to increasing socio-economic activities of the community have a reduction in water recharge areas in this region. Potential problems that can occur due to these conditions are the occurrence of groundwater scarcity, and flooding. This study is intended to determine the critical level of water recharge areas in the watershed. The research method uses descriptive analysis methods that refer to the classification of natural infiltration potential. Important parameters in the classification of natural infiltration include parameters of soil type, land cover, rainfall, and slope. The analysis showed that the critical level of water catchment in the Citarik sub-watershed with good conditions of 5.802.78 ha (25.63%), natural normal conditions 2.291.1 ha (10.12%), rather critical conditions 11.735.3 ha (51, 84%), conditions began to be critical of 1.892.91 ha (8.36%), and critical conditions were 915.73 ha (4.05%). Region are dominate of the water recharge conditions in the Citarik watershed with a rather critical level. Most of the areas with these conditions are settlements, so it is necessary to refill groundwater using infiltration well and bioretention ponds technology.