Background of Organisation: IWM owes its genesis to the Surface Water Simulation Modelling Programme (SWSMP launched in 1986 by the Ministry of Water Resources under the Master Planning Organization to develop a high level of analytical capabilities by use of state-of-the-art mathematical water modelling.With an added impetus generated by the two disastrous floods of 1987 and 1988, for developing a sustainable professional institution in carrying out all the mathematical water modelling tasks in Bangladesh, including hosting of all Flood Action Plan models the SWSMP continued in its 2nd and 3rd phases with the technical guidance DHI by forming a new project organisation Surface Water Modelling Centre (SWMC). By the end of 1996, SWMC was transformed into an independent organisation under the Trust Act.From the 1st of August, 2002 Surface Water Modelling Centre (SWMC) has been renamed as Institute of Water Modelling (IWM) in matching with its research and learning status created in its user community.