STUDY OF DELINEATION OF GROUNDWATER SUSCEPTIBILITY ZONES TO CONTAMINATION USING SINTACS METHOD IN UNCONFINED AQUIFER AT AREA I OF JAKARTA GROUNDWATER BASIN

• Main Author: Utari Parsiayunda, Alifa
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/79270
• Institution: Institut Teknologi Bandung

The environmental condition of urban areas in the northeastern part of the Jakarta Groundwater Basin is experiencing out-of-control anthropogenic activity which is characterized by groundwater areas that are generally classified as heavily contaminated. This condition causes aquifers to be increasingly susceptible to contamination, which is supported by geological conditions such as alluvium and influent stream characteristics. As a result, the potential for groundwater to contamination is high and research is needed to delineate of groundwater susceptibility zones to contamination. The method used is the SINTACS parameter weighting of the Severe Impact type of unconfined aquifer, Area I, Jakarta Groundwater Basin. The results of this research are zone delineation based on the level of susceptibility of groundwater to pollution. The data used are physical parameter data for the analysis of groundwater susceptibility to SINTACS contamination, as well as groundwater quality and salinity parameters as an effect of susceptibility to contamination. The SINTACS parameters in the study area consist of the depth of the groundwater table (S) from 2 – 10 meters above sea level; infiltration (I) from 214.32 – 290.48 mm/hour; the attenuation capacity of the unsaturated zone (N) is composed of alluvium of beach deposits & deltas, alluvium of river deposits, coastal bund deposits, and fine sand & sandy clay; soil attenuation capacity (T) is composed of A(ms,co), A(cm,mc), A(sm), R(cs), A(sc,cs); characteristics of the saturated zone (aquifer) (A) which is composed of sandstone intercalated with claystone; hydraulic conductivity (C) from 2.01 x 10-5 – 5.23 x 10-4 m/s; and the topographical slope (S) averages 10o . By weighting the Severe Impact for the level of vulnerability of groundwater to pollution, the results are 0.12% of the study area with Medium criteria; 95.08% of research areas have Rather High criteria; and 4.80% of research areas with High criteria.