ESTIMASI IMBUHAN AIRTANAH DAS CIDANAU MENGGUNAKAN MODEL NERACA KESETIMBANGAN AIR

Abstract

Groundwater Recharge Estimation using Water Budget Method in Cidanau Watershed. Groundwater is an important factor for economic development in West Serang and Cilegon City. These areas are located within the Cidanau watershed. Moreover, groundwater recharge is crucial to ensure the sustainability and the management of groundwater in an area. This study aims to estimate groundwater recharge in the Cidanau watershed using the Thornthwaite, Dingman, Dingman−Hamon, and Edijatno−Michel methods. These four groundwater recharge estimation methods are water budget method based on the water balance model analysis using the ESPERE version 2 software. The results show three clusters of annual groundwater recharge values in the research location, which are Thronthwaite (157 mm/year), Dingman−Hamon (125 mm / year), and Edijatno−Michel (186 mm / year). The three different values were derived from differences in the effective rainfall values calculations in those three methods. The Dingman and the Edijatno−Michel method tend to have a similar calculation pattern. The groundwater recharge is only 7.8 − 11.6 % of the total annual rainfall in the study area. It is estimated that 80% of the annual rainfall is converted into potential evapotranspiration, and the rest becomes surface runoff