2. MATERIAL AND METHODS 2.1 Case Study (Klang River Basin) The Klang River Basin flowing through Selangor and Kuala Lumpur has experienced flooding for more than a decade. As a capital city of a developing country such as Malaysia, it suffers from urbanization and a high rapid population. The catchment area of the Klang River Basin is 1288km2 with a total stream length of approximately 120 km. Located at 3°17’N, 101°E to 2°40’N,101°17’E, it covers areas in Sepang, Kula Langat, Petaling Jaya, Klang, Gombak and Kuala Lumpur.