GROUNDWATER - SURFACE WATER INTERACTION IN THE MAMPANG SUB-WATERSHED

• Main Author: Palupi, Riana
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/73788
• Institution: Institut Teknologi Bandung

<p align="justify">Jakarta is a city in a downstream area and is traversed by many rivers. making Jakarta have a morphological dependence on the upstream watershed (DAS) in the Greater Jakarta area. The Mampang sub-watershed often experiences floods every year. About 90% of the Mampang Sub-watershed area is in the South Jakarta area. and the rest is in the Depok area. Groundwater - surface water, especially around the banks of rivers/streams. has a close relationship. The interaction of the two has an impact on groundwater–surface water patterns in terms of quantity and quality of water. The purpose of this research is to analyze the Ground Surface Water Exchange Rates (GSWER), and the purpose of this study is to determine the interaction of groundwater-surface water in the Mampang Sub-watershed, to determine the estimated contribution of groundwater-surface water to the Mampang Sub-watershed and to determine the effect of rainfall on groundwater patterns - Mampang sub-watershed surface water. The method used is to collect river discharge field data and groundwater table data. Data processing and analysis were carried out using a SWAT-MODFLOW simulation. The results obtained are the GSWER value for the dry season taken in September 2019; for the gaining stream. the highest is -74 m3/day and for the losing stream the highest is 26 m3/day. while for in the rainy season in February 2020, for the gaining stream the highest is -52 m3/day and for the losing stream the highest is 353 m3/day. The pattern of groundwater–surface water interaction with rainfall is different each year; the highest limit for rainfall values is between 0 - 26.5 mm in 2020 has a gaining–losing pattern. The groundwater contribution in the study area ranges from 0.04% to 11.71%. with an average groundwater-surface water contribution for the East segment of 2.85% and 3.17% for the West segment.