The effect of agricultural activities on water quality at Kuala Krau River, Temerloh, Pahang, Malaysia

Kuala Krau in Temerloh, Pahang, is a significant region for aquacultural and agricultural activities such as fish farming, plantations, and animal husbandry. Although the availability of water supplies, favourable climate, and scenic views encourage these activities, they also negatively impact the water quality of the Kuala Krau River. Three sampling points were selected along the river to assess the parameters of the physico-chemical and heavy metals. In this study, nine physicochemical parameters were analysed to evaluate the water quality of the Kuala Krau River. Five parameters were measured in situ, while the other four were analysed through laboratory testing. The results indicated this river is in Class I for pH and Salinity, Class II for Biochemical Oxygen Demand and Dissolved Oxygen, and Class III for Total Suspended Solids and Turbidity. Only Ferum and Aluminium for heavy metals exceeded the National Water Quality Standards For Malaysia. These findings indicate that the Kuala Krau River is suitable for fisheries, agricultural activities, and livestock drinking. However, regular monitoring is crucial to protect water quality and preserve the habitats for future planning.