Characterization of groundwater in fractured granite at SILK Highway along Kajang – Sungai Long, Hulu Langat, Selangor

Abstract

The study area comprises of outcrops between the Sungai Long Toll Plaza and the Bukit Kajang Toll Plaza. It is one of the popular water collection spots among the public due to its good taste. The research objective is to determine the pattern of fractures with water inflow and to identify the physical and chemical characteristics of the water. The types of rocks along the exposed cut slopes are coarse-grained granites and porphyritic coarse-grained biotite granite. Geological structures found in the study area are joints and faults. A discontinuity analysis on the six slopes show that there are five joint sets, namely, J1, J2, J3, J4 and J5 with strikes and dips N60 ̊E/71 ̊, N287 ̊E/69 ̊, N0 ̊E/66 ̊, N110 ̊E/66 ̊ and N305 ̊E/64 ̊ respectively. The fracture which the water flow from shows the same fracture pattern with the general discontinuities concentrated towards NE – SW and NW – SE. Low values of Dissolved Oxygen (DO), Total Dissolved Solid (TDS) and electrical conductivity compared to well water samples from industrial areas show that the water quality in the study area is much better.