Theme-4-2-Flood modelling in Bangladesh.

Abstract

A general mathematical modelling system for real-time flood forecasting and flood control planning is described. The system comprises a lumped conceptual rainfall-runoff model, a hydrodynamic model for river routing, reservoir and flood plain simulation, an updating procedure for real-time operation and a comprehensive data management system. The system is being used for real-time flood forecasting as well as for flood control modelling studies in a large number of projects. The present paper describes the model application for the Surface Water Simulation Modelling Programme in Bangladesh, where the system is beeing established for the entire country with a coarse discretization and for the South East Region of Bangladesh with a fine model discretization. The objectives of the modelling application in Bangladesh are to enable predictions of the effects of alternative river regulation structures in terms of changes in water levels, inundations, siltation and salinity.