Hydrological Change Effects on Sungai Langat Water Quality

This study attempts to assess the impact of various types of land use along Sungai Langat and describes hydrological change and water quality variation along this river.This study also determines water quality of Sungai Langat based on low flow dry period Q 100,7 using the application of QUAL2K.Dissolved oxygen (DO), pH, temperature and conductivity were measured in situ.Biochemical oxygen demand (BOD 5 ), ammonia nitrogen (NH 3 -N) and total suspended solid (TSS) were analysed according to the standard methods (APHA).Water quality data was referred to National Water Quality Standards for Malaysia (NWQS) proposed by Malaysian Department of Environment (DOE) to estimate Sungai Langat water quality status.Four important water quality parameters namely DO, BOD 5, NH 3 -N and TSS were simulated with QUAL2K version 2.07 for 83.67 km.As regard to individual parameter, DO classified this river into class III, BOD 5 in Class II, NH 3 -N in Class IV and TSS in Class I. Based on QUAL2K simulation for low flow scenario, the results clearly demonstrates a gradually reduction of DO and BOD 5 whereas NH 3 -N and TSS display opposite.Only NH 3 -N was found significantly increase which cause low water quality class towards the downstream.Three parameters namely DO, BOD 5 and NH 3 -N show effects of industrial which approximately located at the middle of river stretch.The TSS was contributed to the river system at the upstream and downstream of the river stretch which most likely from sand mining activity which located at Sungai Long, Cheras (near R5) and Sungai Semenyih (R11).