Modelling of Urban Flooding in Dhaka City

Flooding in urban areas is an inevitable problem for many cities in Asia, in the year 2000 Bombay, India and Phnom Penh, Cambodia had serious problems related to urban flooding. In Bangladesh, Dhaka has faced water logging for the last years. Even a smaller rain events may cause that parts of Dhaka have water standing in the streets. The situation was highlighted in September, 1996 when residences experienced ankle to knee-deep water on the streets. Daily activities in parts of the city were almost paralysed. Heavy traffic jams occurred due to stagnant water on the streets. With the advances in computer technology, many cities manage local and small flood problems with the computer-based solutions. But at present, a few studies of urban flooding with the simulation of both a surcharged pipe network and extensive flooding on the surface are available. In this study, modelling of urban flooding with the interaction between the pipe system and the surface flooding, including a description of the interaction between street and pipe network are carried out.