ANALISIS VARIABILITAS BASE FLOW SUB-DAS CIKAPUNDUNG PADA POS DUGA AIR GANDOK

• Main Author: Rezky Aditya, M
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/35551
• Institution: Institut Teknologi Bandung

Base flow is component of streamflow originating from groundwater discharge and it takes important contributions for the streamflow during dry seasons or low precipitation. To knowing the Cikapundung middle section watershed’s capacity for fullfilling the hydrology function, base flow separation is performed using smoothed minima method, which is developed by Institute of Hydrology (1980), to find the Base Flow Index (BFI) values. By using the method, base flow is analyzed through the BFI annual values from daily streamflow data during 1976-2012. BFI annual value of Cikapundung's middle course is ranged between 62,3% - 96,3%. Spearman-Conley’s rank correlation test to the 1976-2012 data series shows the decreasing trend of BFI values. Decreasing of BFI values collaterally happens with decreasing of base flow contribution to the total streamflow. Two factors estimated affecting base flow variability are: anthropogenic or human activities, such as land use changes and groundwater exploration; and natural factors, such as climate anomaly. Reduction of base flow contribution to the total streamflow of Cikapundung's middle course watershed brings impact in form of drought during dry season or low precipitation. The reduction also estimated affects efficiency and effectiveness of water treatment by PDAM Badaksinga and Dago Pakar; also it is affecting Dago Bengkok Power Plant’s effectivity to accomplish Bandung city’s residents need. It is necessary to manage water resources and manage watershed intregatedly and sustainably as solution to maintain quantity, quality, and continuity of water resources.