Spatial Distribution of Water Quality Index in Stormwater Channel: A Case Study of Alur Ilmu, UKM Bangi Campus

Objective : The present paper aims to provide an overview of current status of water quality by analyzing spatial distribu tion of water quality index (WQI) in Alur Ilmu. Method : WQI is used to outline large amount of water quality data into simplest term in water quality classification. The stormwater channel was in-situ monitored and the water samples were ex-situ analyzed seasonally (both dry and rainy seasons) from thirteen stations along the stormwater channel. Six selected parameters, namely dissolve oxygen (DO), pH, ammoniacal nitrogen (NH 3 N), total suspended solid (TSS), biological oxygen demand (BOD) and chemical oxygen de- mand (COD), were used to determine WQI. Spatial analysis was conducted based on the thematic maps which were gener- ated using geostatistical approach whereby Kriging models were used for the mapping of WQI along Alur Ilmu. Result: From the WQI analysis, dry season (68.85 - Class III) is lower than that of rainy season (75.94 - Class III). The comparison of seasonal WQI spatial distribution analysis shows AL5 is the most influential point for source of pollution along Alur Ilmu during dry season. Conclusion : From the Kriging models, the water quality in Alur Ilmu can be determined which is beneficial for the plan- ners and decision makers to device policy guidelines for effective management of stormwater in the campus.