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Application of Mathematical Model for Flood Hazard and Flood Management of Gumti River

Md. Masud HASSAN
Institute of Water Modelling (IWM), Bangladesh

Afzal HOSSAIN
IWM, Bangladesh

M.A. KARIM
IWM, Bangladesh

Abstract/ Executive Summary:

The Gumti River originates from India, flows into territory of Bangladesh and ultimately falls into the river Meghna. Each year several flash floods occur in this river during monsoon. Due to high flood level and heavy rainfall during monsoon, in the recent year serious flood and breaches occurred in the embankment of this river. Accordingly, the objective of the study was to investigate different scenarios for finding the most feasible option for reducing flood hazard and improving flood management in the Gumti basin using mathematical model. Total thirteen nos. of options have been studied. Model results of all options have been demonstrated to the field officials and stakeholders for social acceptability. Finally, one option has been recommended considering technical, social, economical and environmental aspects. Implementation of the recommended option will reduce flood hazards and flood damages in the Gumti Basin.

Keywords: Flood Management, Flashy River, Mathematical Model, Technical Alternatives

Location: Gumti River, Comilla

Start Date:

End Date:

Program Area: Socio-economic and Policy

Non-commodity: Performance

Objectives:

To study the effect of application of mathematical model for flood hazard and flood management of Gumti river. The main objective of the study was to investigate different scenarios for finding the most feasible option for reducing flood hazard and improving flood management in the Gumti basin using mathematical model.

Methodology:

Study activities involved in representing the physics of the project area into the model and then proceeding with model simulations in order to simulate different options with the model. For conducting this study, an approach has been adapted with due emphasize on data collection. Data collections are needed for model development, calibration and validation. However, different components of the study have been enumerated below: 1) Hydrometric, Hydro-meteorological and Cross Section Data Collection. 2) Development of Digital Elevation Model (DEM) based on Secondary Data. 3) Model Development, Calibration and Validation. 4) Application of Model and Analysis of Model Result. 5) Impact Assessment considering Socio-economic and Environmental aspect. 6) Formulation of a Flood Management Plan.
An intensive hydrometric and hydro-meteorological data collection programme was carried out for the monsoon (June-August) 2002 & 2003 for model development, calibration and validation. Series of cross-sections, channel connectivities, structure locations etc were procured for model development. The land topography was also collected from 1:16000 water development maps prepared by FINN Map authorities in 1989 based upon aerial photographs and field surveys done in 1987. Digital Elevation Model (DEM) for the study area has been developed from this topographic data. Stage-Discharge rating also has been developed for the station Comilla at Chainage 5.59 km of Gumti River using measured discharge from 1997 to 2003. Frequency analysis of the available observed data at Comilla has been carried out to select the design year for different return period. 50-year flood event has been selected as design event. In this study, year 1983 has been determined as design event year.

Various technical alternatives have been formulated in consultation with stakeholders to resolve the existing flooding problems of Gumti River. The development alternatives were studied using calibrated and verified model against the monsoon of 1983 i.e. 50-year flood event since this year has been determined as the design event year. Total thirteen nos. of options have been studied. In each option re-sectioning of existing embankments to some extent was considered to protect the embankments from overtopping at 50-year design flood.

Source of Information: International Conference on Water & Flood Management (ICWFM-2007), 12 - 14 March 2007, BUET, Dhaka, Bangladesh

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Various technical alternatives have been formulated in consultation with stakeholders to resolve the existing flooding problems of Gumti River. The development alternatives were studied using calibrated and verified model against the monsoon of 1983 i.e. 50-year flood event since this year has been determined as the design event year. Total thirteen nos. of options have been studied. In each option re-sectioning of existing embankments to some extent has been considered to protect the embankments from overtopping at 50-year design flood.

Knowledge Management: Report/Proceedings