Author(s): M. F. Bari; M. Hasan
Linked Author(s):
Keywords: Conceptual model; Rational method; Runoff coefficient; Urban runoff
Abstract: During the last 25 years or so rapid urbanization has taken place in Dhaka city. Substantial increase in built-up areas has taken place due to development of residential and commercial areas mostly through private land developers and real estate business. These activities resulted in substantial increase in impervious area, created obstruction to natural drainage pattern, and reduced detention basins, which in turn lead to shortening of the runoff concentration time and an increase of the peak flow. In this paper efforts are made to investigate the increase in built-up area with progression of urbanization and corresponding increase of runoff rates and volume. Peak runoff rates computed by a rainfall-runoff model were compared with the results obtained by the rational obtained. Results showed that simple but widely used rational method produced comparable results.
Year: 2001