Flood Studies at IWFM

Saiful IslamAssociate Professor

Institute of Water and Flood Management (IWFM)Institute of Water and Flood Management (IWFM)Bangladesh University of Engineering and Technology Bangladesh University of Engineering and Technology

February 24, 2009

Floods and IWFM

• Institute of Flood Control and Drainage Research was established in 1974 and later renamed as the Institute of Water and Flood Management (IWFM) in 2002.

• The Institute pursues research and capacity development in the field of water and flood management that is vital for economic development and social prosperity of the country.

http://teacher.buet.ac.bd/diriwfm/http://teacher.buet.ac.bd/diriwfm/index.htmlindex.html

IWFM

Vision

• IWFM is a premier institute for the advancement of knowledge and development of human resources in water and flood management.

Mission  

• To promote integrated water resources management.

Recent Studies on Flood

• Improving Flood Forecasting of Bangladesh using Artificial Neural Network (ANN) and Remotely Sensed Rainfall Data.

• Hydrologic Aspects of Flood 2007. http://teacher.buet.ac.bd/diriwfm/flood/doc/Flood_2007.pdf

• Investigation of Hydrological Aspects of Flood-2004 with Special Emphasis on Dhaka City.

http://teacher.buet.ac.bd/diriwfm/flood/doc/Flood%202004%20study-%20final%20report.pdf

Some of the past studies at IWFM

• Performance evaluation of FCD/FCDI projects during 1998 flood.

• Effects of Coastal Phenomena on the 1998 Flood .

• Modalities for Environmental Assessment: Flood Loss Control in Bangladesh in Integrating Environmental Considerations into economic policy Making Processes.

• Hydrologic Characteristics of 1998 Flood in Major Rivers

• Performance Evaluation of FCD/FCDI Projects during 1998 Flood

• Review of Flood Management Practices with respect to 1998 Flood: A Thematic Study.

• Impact of 1998 Flood on Dhaka City and Performances of Flood Control Works.

• Flood Control in a Floodplain Country: Experiences with Bangladesh.

• Flood Frequency Analysis, Component of the Study on Revision of Flood Danger Levels in Bangladesh

Flood Study on Dhaka City

A study was carried out immediately after flood 2007 with the following objectives:

to explore the causes of the flood 2007to investigate the hydrologic aspects of flood

2007to compare Flood 2007 with major historic

floodsto determine the extent of flood 2007to evaluate the performances of flood control

structures around Dhaka city

River System surrounding Dhaka City

Hydrographs

Flood StatsParameters River Gauge

Station2007 2004 1998 1988

       

 Height of peakflood level inmeter aboveDanger Level

Buriganga Dhaka 0.02 0.7 1.23 1.58

Turag Mirpur 0.68 1.35 2.03 2.41

Tongi Khal Tongi 0.78 1.05 1.46 1.75

Balu Demra 0.5 - - -

  Buriganga Dhaka 1 17 56 22

Duration of flood

in days aboveDanger Level 

Turag Mirpur 25 26 69 30

Tongi Khal Tongi 29 22 65 25

Balu Demra 20 - - -

Flood Control Works

Performance of Flood control works around Dhaka city

Rampura temporary pump station shows negligible impact on drainage congestion

Temporary pumps near Hazaribag discharge untreated waste water which cause serious

pollution of Buriganga river

Dredging in Turag river filsl wetlands of Dhaka west. Serious thread to retention ponds of

Goran chatbari pumping stations.

Encroachments gradually increases and reduces retention pond area of Kallayanpur pump station

Floating mat of waste on Dholai khal indicates poor solid waste management of the Dhaka city

Water hayacintih grows due to polluted water comes from the pumping of untreated drainage water inside embankment

Improving Flood Forecasting of Dhaka Using Artificial Neural Network

• Ganges-Brahmaputra-Meghna Basins

Boundary Stations as Input Node

Measured Versus Predicted

Goodness Fit  Time(days) 

Goodness-of-Fit Water Level

R2 RMSE(m)

MAE(m)

MaximumError

(m)

ErrorStandardDeviation

(m)

1 0.601 0.607 0.475 1.249 0.592

2 0.636 0.573 0.415 1.356 0.567

3 0.681 0.529 0.394 1.014 0.517

4 0.700 0.506 0.373 1.093 0.517

5 0.680 0.515 0.388 1.451 0.514

6 0.634 0.543 0.410 1.197 0.525

7 0.663 0.514 0.374 1.054 0.486

8 0.643 0.530 0.399 1.163 0.503

9 0.639 0.518 0.403 1.299 0.508

10 0.537 0.579 0.455 1.782 0.570