ANALYSIS OF GROUNDWATER RECHARGE USING HYDROGRAPH SEPARATION AND WATER BUDGET: A CASE STUDY IN THE RIVER FLOW REGION OF CIUJUNG, PANOSONGAN VILLAGE, PAMAYARAN SUB DISTRICT, SERANG REGENCY Felia Nur Rohata(a*), Selly Feranie(b), Gumilar Utamas Nugraha(b)
Departement of Physics Education, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No. 229, Bandung 40154, Indonesia
Abstract
Groundwater has been used in many countries to meet the needs of both the household, industrial, and agricultural sectors. The availability of groundwater is very dependent on how much recharge. The Ciujung Watershed as the largest river in Banten Province passes through Lebak, Pandeglang, and Serang Regencies. The increase in population in the Serang area demands adequate water supply, it is necessary to know the estimated quantity of groundwater recharge in the area. In this study, to obtain the estimated value of groundwater recharge using the water budget method and the hydrograph separation method, the researchers used the ESPERE software. The groundwater recharge value in the water bugdet for the Thornthwaite method is 443 mm/year, the Dingman method has an recharge of 446 mm/year and the Edijatno-Michel method has an recharge value of 444 mm/year. Meanwhile, the hydrograph separation method for the Wallingford method has an recharge of 459 mm/year and the Chapman method has an recharge of 558 mm/year. The groundwater recharge value is different from previous research, this is because there are several things related to the hydrological cycle and the hydrogeological cycle such as land use at the research location, slope conditions at the research site.
Keywords: Groundwater, water budget, hydrograph separation method, ESPERE software, Thornthwaite, Dingman, Edjatno-Michel, Chapman, Wallingford, evapotranspiration, the river flow region of Ciujung, Serang
