A Study on the Soil Properties and Subsurface Characterization for Riverbank Filtration by using 2-D Electrical Resistivity Method at Jenderam Hilir, Dengkil, Selangor.

The Riverbank filtration (RBF) study in Jenderam Hilir, Selangor is a pilot project to develop a better and sustainable source of water and will provide a good platform to introduce this method in Malaysia. This study has been carried out to identify the soil characteristics of the riverbank soil of the monitoring well and resistivity at the riverbank of Langat River. Soil samples taken from adjacent monitoring wells namely Monitoring Well 1, Monitoring Well 3 and Monitoring Well 4 were initially examined for the Particle Size Distribution (PSD) according to British Standard 1377: Part 2:1990. PSD of the soils was obtained from sieve analysis and hydrometer method. Sieve analyses of the soil were performed to support of geological bore logs while the hydrometer method is used to determine the distribution of finer particles. Resistivity, which uses current to measure the resistivity of the subsurface, was used during this project. Resistivity was measured through an ABEM SAS 4000 Terrameter by using a Wenner-Schlumberger array. 2 resistivity lines were executed by using a 1.5m spacing of electrode. The resistivity data were then processed and interpreted using the RES2DINV software. Results from both tests shown that at MW3 which is located at the top of the surface layer which is 0 to 4 meter can be classified as sandy silt with a resistivity value of 11-60Ωm. While for MW1 and MW4 the resistivity value shows 60 - 200 Ω which is classified as silty sand type. From the results, it has revealed that the study about the process of losing or gaining of river water passing through riverbank material towards a production well is carried out. [ABSTRACT FROM AUTHOR]