The research involves connecting hydrology modelling to climate change downscaled output by GIS system to enhance the understanding of the impact of climate change scenarios on the river flow. The study provides the useful hydrology data for the future development in Klang watershed. The Hadley Centre Third Generation-GCM model has been employed for emission scenarios A2 and B2 for the period 2001-2100. The output from statistical downscaling model is used as input into HEC-HMS hydrological modelling to project the discharge of Klang River. Then, the hydrological model output is used to determine the future streamflow in the watershed. To evaluate the future climate change, the long time period of projection to 2100 is divided into three parts (2020s, 2050s and 2080s). The mean annual discharge is predicted to be decreasing by 9.4, 4.9 %, and an increase of 3.4 % for the A2 and a decrease of about 17.3, 14.3 and 6.2 % for the B2 scenario, respectively, in the 2020s, 2050s, and 2080s.

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