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Geographical Location of Bangladesh Bangladesh

Flood Management in Bangladesh

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Page 1: Flood Management in Bangladesh

Geographical Location of Bangladesh

Bangladesh

Page 2: Flood Management in Bangladesh

The Ganges, Brahmaputra & Meghna Basins

Country

Ganges Basin Brahmaputra Basin Meghna Basin

Area

(sqkm) %

Area

(sqkm) %

Area

(sqkm) %

Bangladesh 39,726 4.0 38,956 7.0 31,859 41.1

India 770,197 77.3 197,504 35.7 44,934 58.0

Nepal 149,417 15.0 1,324 0.2

Bhutan 41,324 7.5

China 36,941 3.7 273,539 49.5

Myanmar 690 0.9

Total 996,281 552,646 77,483

Page 3: Flood Management in Bangladesh

Digital Elevation Model of . DEM of Bangladesh

SRTM 90m

SRTM, 90m

Page 4: Flood Management in Bangladesh

Complex River Network

River System: 24,000 km,

57 trans-boundary rivers

Page 5: Flood Management in Bangladesh

• Highest in Sylhet (> 6,000mm)

• Lowest in Rajshahi

Page 6: Flood Management in Bangladesh

Rainfall in Cherrapunji, Meghalaya - Home of Clouds

The wettest place in the World, Annual

Average 12,000mm, max 26,442 (1861)

Page 7: Flood Management in Bangladesh

• Monsoon rainfall

• Spring snow melt

• Deforestation in Nepal & Tibet

• Soil Erosion

• Low topography in

• River silted up

• Cyclones/CC/SLR

Page 8: Flood Management in Bangladesh

Snow melting in

Himalays

Page 9: Flood Management in Bangladesh

Deforestation

in Nepal

Page 10: Flood Management in Bangladesh

Flood in Bangladesh

River Flood

Flash Flood

Rain-fed Flood

Tidal Flood

Unique geographical locations

Excess runoff from U/S

Low topography , River siltation

Sea swell during monsoon

Low gradients of major rivers; Gan – 3cm/km, BPutra –

8cm/km and Meg- 3cm/km

Page 11: Flood Management in Bangladesh

Catastrophic floods: 1987,1988, 1998, 2004

Casualties in 1998 floods • Over 60% area inundated

• Over 30 million people affected

• Over 4300 km of roads damaged

• Food grain loss 2.2 million tons

• 270 thousands fish farms washed away

• More than 3000 industries were affected

Floods in Bangladesh

Every year about 20 % of the cultivable

area is inundated more than one meter

about 4 to 6 months period

Situation deteriorates during floods of

higher magnitude

Flooding reduces economical activities and enhances poverty

Page 12: Flood Management in Bangladesh

Water Level Comparison (1988, 1998, 2004)

Water level comparable with

those of 1998 in Ganges and

Jamuna

Major 3 Floods in Bangladesh

Bahadurabad on the Jamuna River

15.5

16.0

16.5

17.0

17.5

18.0

18.5

19.0

19.5

20.0

20.5

16-May 31-May 15-Jun 30-Jun 15-Jul 30-Jul 14-Aug 29-Aug 13-Sep 28-Sep

Date

Wa

ter

Le

ve

l (m

PW

D)

1998

2004

1988

Hardinge Bridge on the Ganges River

6.5

7.5

8.5

9.5

10.5

11.5

12.5

13.5

14.5

15.5

16-May 31-May 15-Jun 30-Jun 15-Jul 30-Jul 14-Aug 29-Aug 13-Sep 28-Sep

Date

Wa

ter

Le

ve

l (m

PW

D)

2004 1998

1988

Bhagyakul on the Padma River

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

6.5

7.0

7.5

8.0

16-May 31-May 15-Jun 30-Jun 15-Jul 30-Jul 14-Aug 29-Aug 13-Sep 28-Sep

Date

Wa

ter

Le

ve

l (m

PW

D)

1998

1988

2004

Page 13: Flood Management in Bangladesh

Niketon area, Gulshan-1

Flood in 2004

Houses beside Hatirjheel

Pump Drainage

Motijheel Area

Page 14: Flood Management in Bangladesh

Flood 2007

Page 15: Flood Management in Bangladesh

Flood in Bangladesh – Few Shots 2007

Page 16: Flood Management in Bangladesh

Damage to infrastructure goes higher even with flood of lower

magnitude

Comparison of Losses Resulting from Recent Floods

Page 17: Flood Management in Bangladesh

Risk Factors with respect of Water Induced Disaster

Low lying area, 80% area below 9.0m

Flat topography, mild to low slope (10-20cm/km)

Located at the outfall of 3 mighty rivers

Large coastal exposures, east to west along the south

High population density

Infrastructure development and rapid urbanization

Limited coverage of flood forecasting

Limited disaster preparedness capability, e.g limited

flood shelters

Page 18: Flood Management in Bangladesh

The geographical location

and average land levels of

Bangladesh are conducive

to Flood, Erosion, Storm

Surge

Average inundation 22%

68% area inundated in 1998

About 1/4 th of the country susceptible to tidal surges

Over 3000 km river bank will be eroded by 2025

Water scarcity in 7

months a year

Page 19: Flood Management in Bangladesh

How to cope with the new challenges

Increase in precipitation in monsoon

Increase in evaporation

Increase in snow melt in the Himalayas

Prolonged monsoon

Increase in salinity intrusion

Drought

Impact on agriculture

& fisheries

Increase in flooding intensity

Sea level rise

Decrease in precipitation in dry season

Submergence of coastal areas

Cyclone

Page 20: Flood Management in Bangladesh

Bangladesh

The land of

intricate river

Systems

Because of geographical

location, low topography, deltaic

plain, complex river system,

high population, agriculture

dominated economy, huge

losses due to flood, present

level of preparation etc

International bodies including

UNDP has identified

Bangladesh to be the most

vulnerable country in the

world with respect to climate

change and disaster

Joint probability of flood and

cyclone surge…

Page 21: Flood Management in Bangladesh

National Plans and Policies:

Travelling a long way

1972, IBRD Plan

National Water Plan 1, 1986

National Water Plan 2, 1991

Flood Action Plan, 1989-95

BWFMS, 1995

National Water Policy, 1999

Guidelines for PWM, 2000

1964, IECO Master Plan

NWMP, 2004

National Flood Workshop, 2004

Coastal Zone Policy

Coastal Zone Plan, 2005

There is no shortage of

national policies, plans

and frameworks – there

is shortage of their

proper application and

integration/implementat

ion

Climate Change Strategy 2008

Page 22: Flood Management in Bangladesh

Krug Mission Report 1957

Disastrous floods of 1954, 1955 and 1956 focused world attention

on the importance and the need for flood control and water

management in Bangladesh (the then East Pakistan). The report

stressed that water resources development was essential for

higher agricultural production and flood control as central

issue

Recommendation of the Mission Report led to the formulation

of the EPWAPDA Master Plan, 1964

Chronological Development of Water Management

Page 23: Flood Management in Bangladesh

EP WAPDA Master Plan 1964

EPWAPDA 1964 Master Plan emphasized to meeting

agricultural demand of water through large scale public

sector development for both dry season (irrigation) and

wet season (flooding) water management.

The Plan identified 63 water development projects.

This initiated the implementation of large scale Flood

Control Drainage (FCD), Flood Control, Drainage &

Irrigation (FCDI) projects including the protection of

most of the Coastal zone against tidal flooding and

Hydropower generation..

Chronological Development of Water Management

Page 24: Flood Management in Bangladesh

Land & Water Sector Strategy 1972

The proposed strategy emphasized the need for

quick results from water development efforts in

order to achieve food grain self-sufficiency. It

attached high priority to small and medium sized,

simple, low cost, labour intensive projects.

Although, Government did not accept the study as

a whole but the strategy of the government in the

water development sector was greatly influenced

by the study report.

Chronological Development of Water Management

Page 25: Flood Management in Bangladesh

MPO National Water Plan-1 1986

MPO National Water Plan-2 1991 NWP marks the systematic planning practice in Bangladesh

NWP -I , 1987 has set the following investment priorities:

(i) Minor irrigation schemes, LLP, STWs and DSSTWs

(ii) Major irrigation schemes (FCDI)

(iii) Deep tubewells (DTW)

(iv) Flood Control and Drainage Scheme (FCD).

In NWP-II, a detailed investment programme were prepared. The 20

year (1991-2010) public investment programme gave more emphasis to

FCD than NWP Phase-1. Both NWP's made important contributions to

the knowledge and understanding of the water resources of

Bangladesh. However the report was not accepted by the Government..

Chronological Development of Water Management

Page 26: Flood Management in Bangladesh

Flood Action Plan 1989-95

After the disastrous floods of 1987 and 1988, Government as well

as development partner's attention were once again focused to the

flood problem which initiated the Flood Action Plan. Noteworthy

features of FAP are : 26 Studies were conducted.

Attention was paid to urban FCD and non-structural flood

proofing, though agriculture remained the main focus of

regional plans;

Social, environmental and fisheries impacts and people's

participation were given particular emphasis.

Emphasized formulation of National Water Strategy

Chronological Development of Water Management

Page 27: Flood Management in Bangladesh

Bangladesh Water & Flood Management Strategy-1995

The BWFMS was the major strategy follow-up to FAP and

became the working policy document for the water sector.

It recommended a 5 year programs involving:

Preparation of National Water Policy

Preparation of a National Water Management Plan.

Strengthening of water sector organizations responsible

for planning, construction, operation and maintenance

Chronological Development of Water Management

Page 28: Flood Management in Bangladesh

Develop early warning and flood-proofing systems to manage natural

disasters like flood and drought

Designate flood risk zones and take appropriate measures to provide

desired levels of protection for life, property, vital infrastructure

agriculture and wetlands.

Policy Statement in NWPo - Related to Disaster Management

Guidelines for Protection

Regions of economic importance will be fully protected against floods.

Other critical areas, will be gradually provided reasonable degree of

protection against flood.

In the remaining rural areas, with the exception of those already covered by

existing flood control infrastructure, the people will be motivated to develop

different flood proofing measures such as raising of platform for homesteads,

market places, educational institutions, community centers, etc., and

adjusting the cropping pattern to suit the flood regime.

Page 29: Flood Management in Bangladesh

A system of cost recovery, pricing, and economic incentives/disincentives is

necessary to balance the supply and demand of water.

Cost recovery of services such as flood control, drainage, irrigation, and

wastewater treatment has not been considered adequately

Cost recovery for FC and FCD projects is not envisaged in this policy. In case of

flood control, drainage, and irrigation (FCDI) projects water rates will be charged

for O&M as per Government rules.

Investigate thoroughly important flood control and management issues, such as

the efficacy of coastal polders, for guiding future policy on structural

interventions.

Undertaking any special study, as may be required, for fulfilling the objectives

and programmes envisaged in the NWPo and the Bangladesh Water and Flood

Management Strategy (BWFMS).

Policy Statement in NWPo - Related to Disaster Management

Page 30: Flood Management in Bangladesh

Agriculture & Water Management

Environment & Aquatic Resources

Main Rivers

Major Cities

Disaster Management

Towns & Rural Areas

Institutional Development

Enabling Environment

Total 84

Programmes

8 Programmes

10 Programmes

17 Programmes

6 Programmes

12 Programmes

10 Programmes

8 Programmes

13 Programmes

National Water Management Plan, December 2001

Page 31: Flood Management in Bangladesh

BWDB, WARPO,

JRC, RRI,IWM, CEGIS DoE, DoFo

LGED, DPHE,

DWASA , CWASA

DMB

DoF

BMD,

SPARRSO,

SoB,

Key Organizations

Ministry of

LGRD

Ministry of

Disaster Management

and Relief

Ministry of Fisheries &

Live Stocks

Ministry of

Shipping

Development

Partners

Ministry of

Communication

Ministry of

Agriculture Ministry of

Defence Ministry of

Works

BIWTA

BARC, BADC,

BARI, SRDI

RHD

WB, ADB

RNE, DFID

etc.

BUET, DU,

IWM,CEGIS

RAJUK

Ministry of

Environment

& Forest

Universities, NGO,

Pvt Organisations

Ministry of

Water

Resources

Page 32: Flood Management in Bangladesh

Organizations under the Ministry of Water Resources

Bangladesh Water Development Board (BWDB)

Water Resource Planning Organization (WARPO)

River Research Institute (RRI)

Joint Rivers Commission (JRC)

Bangladesh Haor & Wetlands Development Board (BHWDB)

Center for Environmental & Geographic Information Services (CEGIS)

Institute of Water Modelling (IWM)

BWDB is entrusted with the task of

managing the country’s water

resources through implementation of

flood control, drainage & irrigation

(FCDI), river erosion, dredging, land

reclamation, coastal zone

management, GW development and

other allied project for socio-economic

development of the country. Its main

principal of operation is IWRM and

active beneficiary participation..

WARPO is an apex organization

under the Ministry of Water

Resources, dealing with nationwide

water resources planning. The

Water Resources Planning Act

1992 and the National Water Policy

of the Government of Bangladesh

mandated and assigned various

important responsibilities

Page 33: Flood Management in Bangladesh

Organizations under the Ministry of Water Resources

Bangladesh Water Development Board (BWDB)

Water Resource Planning Organization (WARPO)

River Research Institute (RRI)

Joint Rivers Commission (JRC)

Bangladesh Haor & Wetlands Development Board (BHWDB)

Center for Environmental & Geographic Information Services (CEGIS)

Institute of Water Modelling (IWM)

A research institute that conducts

tests (physical models) & research in

the fields of River, Estuarine &

Coastal Hydraulics at local level

including Soil Mechanics, Material

Testing & Sediment Technology.

Performs integrated environmental

analysis using technology such as

GIS, RS, databases and IT and

provides solutions to challenges

related to natural resources

management.

Provides services in the field of

Water Modelling, Computational

Hydraulics & allied sciences for

integrated water resource

management to enhance the quality

of planning, implementation &

monitoring activities.

A research institute that conducts

tests (physical models) & research in

the fields of River, Estuarine &

Coastal Hydraulics at local level

including Soil Mechanics, Material

Testing & Sediment Technology.

Page 34: Flood Management in Bangladesh

DDM is mandated to implement the objectives of Disaster Management Act by

reducing the overall vulnerability from different impacts of disaster by

undertaking risk reduction activities;

DDM conducts humanitarian assistance programs to enhance the capacity of

poor and disadvantaged, coordinates programmers of various GO and NGOs

related to disaster risk reduction and emergency response.

DDM is responsible to execute the principles, plans, directions and

recommendations of GoB related to disaster management.

DDM conducts research, organizes workshops and training programs,

publishes its reports and documents and provide various policy advisory

services to the concerned Ministry of the Government of Bangladesh.

Page 35: Flood Management in Bangladesh

National Level Council and Committees for Disaster Management

Page 36: Flood Management in Bangladesh

Flood Mitigation Structural measures

• Embankments • Hydraulic Structures

Non-structural measures

• Flood forecasting and dissemination

• Flood preparedness, etc.

• Flood relief

What has been done to reduce the huge losses of lives and properties?

Since flood can not avoided in Bangladesh then what can be done to compensate the flood losses, properties and to minimize the sufferings?

• Flood Insurance

Page 37: Flood Management in Bangladesh

What has been achieved so far?

Structural measures:

Flood protection – over 10,000 km flood protection

embankment

Flood and Cyclone Shelters

Page 38: Flood Management in Bangladesh

0

20000

40000

60000

80000

100000

120000

140000

160000

Total Area SQKM

100%

Flood Prone

65%

Controlled

40%

25%

FLOOD CONTROL

Page 39: Flood Management in Bangladesh

What has been achieved so far? Non-structural measure

Established a Flood Forecasting and Warning Centre

Flood Forecasting Model (Super Model) has been

re-calibrated 2007-08 conditions

Forecast, using Super Model, is generated for

up to 5 days (24 hrs, 48 hrs,72 hrs .. ) on regular

basis during monsoon, Apr- Spt

10 days also during monsoon (CFAN), Apr-

Sept, not widely circulated

Dissemination of warning through Government and

NGO initiatives

DMB plays a great role for Disaster Management

Page 40: Flood Management in Bangladesh

Flood Forecasting in Bangladesh Chronological development

In the initial stage of the establishment of FFWC in 1972, there was 10

real-time flood monitoring points where forecast information was based

on the correlation analysis and Muskingum-Conge flood routing model.

During the period of 1989-94, through UNDP assistance project and

DANIDA funded Flood Action Plan 10 (FAP10) project, hydrological/

hydraulic approach utilizing MIKE11 was employed and forecast was

made at 16 locations.

During the time of 1995-99, through extension of FAP10, expansion of

Flood Forecasting and Warning System (FFWS) using MIKE11 with GIS

facilities was made and forecast was increased at 30 locations.

In 2000 to 2005 period, the model area (super model) was extended,

and forecast stations were increased to 38 no. under another DANIDA

funded project.

A project funded by CDMP-II is on going under FFWC, which is being

conducted to increase forecast lead-time from 3 days to 5 days

including generation of flood forecast at three selected projects.

Page 41: Flood Management in Bangladesh

Flood Forecasting & Warning System in Bangladesh Water Level Forecast: 1-5days & 10days (probabilistic)

Forecasting Output

Forecast bulletin

Flood hydrograph

Thana status map

Flood map

IWM with DHI developed &

updated the FFWC model

Provides modelling and technical

support to FFWC

Training to BWDB staff

Role of IWM in Flood Forecasting

Future flood Forecasting

10 days/ Seasonal Forecasting

Low Flow Forecasting

Page 42: Flood Management in Bangladesh
Page 43: Flood Management in Bangladesh

Forecast Hydrographs with 5 days Lead Time

(Experimental)

Page 44: Flood Management in Bangladesh

Forecast Bulletin with 5 days Lead Time

(Experimental)

Page 45: Flood Management in Bangladesh
Page 46: Flood Management in Bangladesh

Location Specific FF

At 3 key Locations

Brahmaputra Right

Embankment

Irrigation Project

- PIRDP

- MDIP

National Highway

- Dhaka – Mawa Road

Page 47: Flood Management in Bangladesh

Location Specific FF Brahmaputra Right

Embankment

BRE (mid sixties) is an Earthen

Embankment, 220km from

Gaibhanda

The river Jamuna is morphologically

very active and erosion prone

Along the BRE, from Gaibandha to

Eneatpur, there are 18 nos of Spurs

& Groyane to protect the important

Townships

Forecasting are at 4 locations;

Gaibandha, Sariakandi, Sirajganj &

Enaetpur

and also forecast profile from

Gaibanga to Enaetpur

Page 48: Flood Management in Bangladesh
Page 49: Flood Management in Bangladesh
Page 50: Flood Management in Bangladesh

Location Specific FF Dhaka- Mawa Highway

Proposed WL Measurement

Locations

Dhaka-Mawa road connects

Dhaka with Mawa Ferry Ghat of

the Padma river stretching

through Munshiganj district.

It is a two lane national

highway having length of 36 km.

Highway is stretched through

a low lying floodplain between

the Padma and the Dhaleswari

river which, Figure attached

Further details of the road will

be given in next progress.

Page 51: Flood Management in Bangladesh
Page 52: Flood Management in Bangladesh

Location Specific FF Irrigation Project PIRDP

PIRDP is located in Northwest region

bounded by Baral-Hurasagar river on the

north, the Ganges on the South, the Jamuna

on the East Abdulpur on the west.

Project area is in 8 Upazila: Pabna

Sadar, Ishurdi, Sujanagar, Faridpur, Bera,

Catmohar, Santhia and Atgharia of Pabna,

2Upazila: Lalpur and Baraigram of

Rajshahi & 1upazila of Sirajganj district.

Project area is 196,680 ha of which

184,534 ha FC, Net irrigable area is

145,263 ha. The project comprises FC of

157.55 km, drainage K of 145.21 km, DR

23 nos & irrigation K of 254.76 km.

RT WL are proposed at Bera PS

Page 53: Flood Management in Bangladesh
Page 54: Flood Management in Bangladesh

FCDI project management using Flood Forecast

• Pump operation

• Emergency

maintenance of

embankment

• Evacuation of people

in the event of

embankment failure

Meghna Dhonagoda FCDI Project

• Total area under FCDI is

17,584 ha.

• The project comprises of

FC Emb of 60.7km, 4

Pump Stations, Drainage

K of 125.5 km, Irri. K of

218km & 69 Regulators

Page 55: Flood Management in Bangladesh
Page 56: Flood Management in Bangladesh
Page 57: Flood Management in Bangladesh

Flash Flood in Northeast Region Major Activities

Physical understanding of Northeast Region

Review past attempts for flash flood model

development in Bangladesh and elsewhere

Develop Flash Flood Model of the Northeast region

using the Northeast Region Model

Investigate the possibility of using of Radar data

from Moulvibazar Radar installed recently

Investigate the possibility of using 3-day short-

duration rainfall forecast provided by ADPC (WRF),

BMD(WRF) and NCMWRF (WRF)

Model Performance checking for hindcast period

Page 58: Flood Management in Bangladesh

DEM : IWM

Page 59: Flood Management in Bangladesh

DEM : IWM

Page 60: Flood Management in Bangladesh

DEM : IWM

Page 61: Flood Management in Bangladesh

DEM : CEGIS

Page 62: Flood Management in Bangladesh

DEM : CEGIS

Page 63: Flood Management in Bangladesh

DEM : CEGIS

Page 64: Flood Management in Bangladesh

Flash Flood Forecast : Lead Time 2 days

(Experimental) Forecasted Water level [m]Measured Water level [m]

00:002013-04-28

00:0004-30

00:0005-02

00:0005-04

00:0005-06

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

Wa

ter

Le

ve

l (m

PW

D)

Kushiyara River at Sherpur; Forecast Date 04-05-2013

Forecasted Water level [m]Measered water level [m]

00:002013-04-28

00:0004-30

00:0005-02

00:0005-04

00:0005-06

5.0

6.0

7.0

8.0

9.0

10.0

Wa

ter

Le

ve

l (m

Pw

d)

Manu River at Moulvi Bazar; Forecast Date 04-05-2013

Forecasted Water level [m]Measured Water level [m]

00:002013-04-28

00:0004-30

00:0005-02

00:0005-04

00:0005-06

5.5

6.0

6.5

7.0

7.5

8.0Khowai River at Habiganj; Forecast Date 04-05-2013

Forecasted Water level [m]Measured Water level [m]

00:002013-04-28

00:0004-30

00:0005-02

00:0005-04

00:0005-06

2

4

6

8

10

12

14

Wa

ter

Le

ve

l (m

PW

D)

Kushiyara River at Sheola; Forecast Date 04-05-2013

Page 65: Flood Management in Bangladesh

Flash Flood Forecast

Bulletin

Page 66: Flood Management in Bangladesh

Detection Range of

the Proposed

Radar System

New Doppler Radar in

Moulvibazar (JICA

fund)

Covers most part of

Meghna basin

Calibration of RADAR

against ground measured

data is needed

Digital form of data

Page 67: Flood Management in Bangladesh

Atomization of Data Processing A computer based Software System

Key Activities

o Data Acquisition

o Data Processing for Model Input

o Data Processing Output dissemination

o http://www.imdguwahati.gov.in/rf24.htm

o http://121.241.116.157/dynamic/weather/delhiregion.html

o http://www.imdkolkata.gov.in/maxminrf.php

o http://amssdelhi.gov.in/dynamic/weather/wxtable.html

o http://imdguwahati.gov.in/dwr.htm

o http://imdnagpur.gov.in/dwr.php

o http://www.imd.gov.in/section/nhac/dynamic/today.htm

o http://www.nepalhomepage.com/hotlinks/weather/index.php

Page 68: Flood Management in Bangladesh
Page 69: Flood Management in Bangladesh

Global warming will hit through water:

Through climate change :

- changes in the hydrological cycle

- sea level rise

- increased water temperatures

Through increased climate variability:

- more serious and frequent extremes,

such as floods, droughts, typhoons

The overall picture Climate Change Impacts, adaptation and vulnerability

Page 70: Flood Management in Bangladesh
Page 71: Flood Management in Bangladesh

AT MIRPUR

2

3

4

5

6

7

8

9

10

11

Wat

er L

evel

(m

PW

D) CC2080 (FL = 8.36m)

CC2050 (FL = 8.14m) Design FL = 7.8m

Crest Level = 10m

R/S

C/S

Drainage congestion in Dhaka City

due to CC would be a serious issue.

Impact of Climate Change on Flood Dhaka Flood Protection Embankment

Page 72: Flood Management in Bangladesh

Inundation of the coastal area due combined effect of SLR and increase of precipetation

1998 Flood due to SLR 1998 Flood due to SLR 60cm & increase of precipitation (ECHAM A2 Scenario): 18% increase of flooding

1998 Flood due to SLR 120cm & increase of precipitation (ECHAM A2 Scenario): 25% increase of flooding

Page 73: Flood Management in Bangladesh

Adaptation

Height of the ground floor should be determined considering the inundation

risk map of that area

Flood Shelter of Bangladesh Red

Crescent Society (BDRCS)

2.0 m PWD

6.0 m PWD

9.5 m PWD (for worst scenario 2050)

Additional Height= 3.5 m

Existing Height= 4.0 m

Kutubdia Island

Page 74: Flood Management in Bangladesh

Climate Change Impact on Water logging

22:00:00

8-9-1998

00:00:00

9-9-1998

02:00:00 04:00:00 06:00:00 08:00:00 10:00:00 12:00:00 14:00:00 16:00:00 18:00:00 20:00:00 22:00:00 00:00:00

10-9-1998

02:00:00

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

2.0

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

3.0

3.1

3.2

[meter] Time Series Water Level (SWV_98-99_HD-Base-Modify-2.res11)

Outfall River

Base SLR 2050 SLR 2100

25-7-1998 4-8-1998 14-8-1998 24-8-1998 3-9-1998 13-9-1998 23-9-1998

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

2.0

2.1

2.2

2.3

[meter] Time Series Water Level (SWV_98-99_HD-Base-Modify-2.res11)

Polder-3

Base SLR 2050 SLR 2100

Affected Polder

(Water Logging)

Existing No. of Structure Adaptation of Drainage System

No. of Structure No. of Vent

(1.52m X 1.83m)

Additional No.

of Vent Required ( BDT. million)

P 3 30 51 46 920

P10-12 15 25 23 460

P17/1 11 11 10 200

P24 11 40 36 720

P25 13 45 41 820

P36 20 144 43 860

P39/2 4 33 10 200

Page 75: Flood Management in Bangladesh

Impact of Climate Change on Agriculture Loss of Crop Production due to MSL rise

Page 76: Flood Management in Bangladesh

0 SLR

60 cm SLR

120 cm SLR

Impact of Climate Change on Salinity Intrusion

(5ppt Salinity line)

Hiron Point

95 km

55 km

Sundarbans

Khulna

Barisal

Bhola Barguna

Patuakhali

Page 77: Flood Management in Bangladesh

Mohora

Impact of SLR(120 cm) on Drinking Water in the

Halda River

Base

Condition

Increase of Salinity with No Kaptai

Release+120 cm SLR

( Worst Scenario)

Page 78: Flood Management in Bangladesh

Mohora

Impact of SLR(120 cm) on Fish Habitat in the

Halda River

Base

Condition

Increase of Salinity with No Kaptai

Release+ 120 cm SLR

(Worst Scenario)

Page 79: Flood Management in Bangladesh

People’s participation specially in the flood prone areas by

providing information, awareness development and

increasing resilience

More emphasis to given on adaptation in the agricultural

sectors, seed variety, cropping pattern, management

practice etc.

Disaster risk incorporated town planning to be introduce for

reduction of urban flooding, water congestion etc.

Reassess and redesign of the flood embankments including

submergible embankments in NE region considering climate

change impacts.

Way forward

Page 80: Flood Management in Bangladesh

Redesign the National Highways, Railways and other key

infrastructures etc considering the climate change impacts

Development of early warning of storm surge inundation

forecasting covering entire Bangladesh.

Reengineering of the coastal polders by phases for Sea level

rise and storm surge for the safety of life and livelihood of

coastal community.

There are need of new cyclone shelters in the newly defined

high risk areas specially in the Barisal and Khulna division.

Way forward

Page 81: Flood Management in Bangladesh

Reassess and redesign of the flood embankments including

submergible embankments in NE region considering climate

change impacts.

Redesign the National Highways, Railways and other key

infrastructures etc considering the climate change impacts

Development of early warning of storm surge inundation

forecasting covering entire Bangladesh.

Reengineering of the coastal polders by phases for Sea level

rise and storm surge for the safety of life and livelihood of

coastal community.

There are need of new cyclone shelters in the newly defined

high risk areas specially in the Barisal and Khulna division.

Way forward

Page 82: Flood Management in Bangladesh

There are knowledge gaps right from downscaling of the

climate model to the considerations of glacial melt or

blending of meteorological science with the hydrology.

Capacity building in these areas will be of prime importance.

Regional cooperation at the basin level for prediction of

climate change impacts and adaptation measures, sharing of

knowledge and development of resources (conservation of

water through upstream reservoirs, flood moderation and

forecasting, navigation, hydro-power etc.)

The existing Bay models are capable of forecasting storm

surge induced flooding. These models extend from Indian to

Myanmar coast. These models can for the basis for regional

cooperation

Way forward Way forward

Page 83: Flood Management in Bangladesh

Thank You

Cost of doing nothing..…. retreat to the top of the Embankment

[email protected]