Utilization and Conservation of Water Resources in Bangladesh
Abu Musa Md. Motaher AHMED1∗, Ph.D and Kingshuk ROY, Ph.D2
1

Senior Scientific Officer, River Research Institute, Faridpur 7800, Bangladesh(Tel.: +880 631 63580 Ext. 246, Fax: +880 631 63065, E-mail: motaher64@gmail.com)
2

Associate Professor, College of Bioresource Sciences, Nihon University, 1866 Kameino,
Fujisawa, Kanagawa 252-8510, Japan(Tel & Fax: +81 466 84 3467, E-mail: royk@brs.nihon-u.ac.jp)

Utilization of water resources in Bangladesh depends on its availability and conservation depends on
the storability subject to upstream conditions of the lower riparian countries. Bangladesh is located at
the lower riparian country of the three major internationally famous rivers, namely the Ganges, theBrahmaputra and the Meghna. Management and development of the water resources of the country iscompletely dependent on the availability of water from the Transboundary Rivers and rainfall
distribution round-the-year. It has been recognized that Bangladesh experiences water shortage in thedry season and water abundance in the wet season which disrupt significantly the agro-environmental
practices and socio-economic activities of the country. To address the problems encountered due tosuch water shortage or abundance, cooperation among the co-basin countries is needed, as well as
proper utilization and conservation of water resources has to be practiced. Agro-environmental
education now-a-days should focus these issues in the perspective of Bangladesh as well as in the
global respect. This paper describes the problems of water resources management and development,utilization and conservation options based on available data and information in the context of
Bangladesh; and possible remedial measures to address and overcome the problems have been
discussed.
Keywords: water demand, water supply, water conservation, water utilization, agro-environmental

1. Introduction
In agro-environmental practice water resources play key role over the other variables.
Agricultural activities and most of the environmental issues are related to water. So water
availability and its proper utilization is a major concern for sustainable development ofagriculture. Agriculture and environment are always interrelated and these two broad areas
should be priori considered in planning and evaluation of any agricultural projects. Water
resources management and its proper utilization improve the agro-environmental conditionsof a country. Compliance with the policy is intended to ensure that the development andmanagement of the nation’s water resources include the protection, restoration andpreservation of natural habitats and their dependent bio-diversity with specific provisions forwetlands, mangrove and other forests, endangered species and water quality. Utilization ofwater resources in Bangladesh depends on its availability and conservation depends on thestorability due to upstream conditions of the lower riparian countries. Water conservationconsists of actions that reduces the demand of water, improve efficiency in use and reduces
losses and waste, and improves land management practices to conserve water. The naturalsubsystem of water resources system are: 1) the interlinked system of rivers, estuaries, canals,
khals (smaller than rivers in size) etc. 2) the floodplain 3) wetlands 4) haor, baor, beel (local
names of different kinds of ponds filled with stagnant rain water), lakes etc. 5) ponds 6) inter∗Corresponding author

tidal lands and water 7) groundwater aquifers. However, other than rivers, the natural
reservoirs are scarce and thereby water conservation in rainy season for dry season use islimited.
Water resources management is now a global concern, the main purpose of which is toprovide adequate water for humans and the natural environment. The water management
includes water utilization, water source conservation, monitoring and preservation of water
quality. In this paper the overall status of water resources of Bangladesh and its utilization indifferent areas with emphasis to conservation is described based on available information.
2. Water resources and Agricultural information
2.1 Geographical and water resources information
Bangladesh lies in the northeastern part of South Asia between 20034′ and 26038′ northlatitude and 88001′ and 92041′ east longitude. The country is bounded by India on the west,
the north and the northeast; Myanmar on the southeast and the Bay of Bengal on the south.
The area of the country is 147,570 sq.km. The country is the lowest riparian of the Ganges
basin, the Brahmaputra basin and the Meghna basin. Most of its area is low lying floodplain
formed by the alluvial soil deposited by three great rivers, namely the Brahmaputra/Jamuna,the Ganges and the Meghna. These rivers drain a catchment area of about 1.72 million km2 in
India, Nepal, China, Bhutan and Bangladesh; only 8 percent of the catchment area lies within
Bangladesh. These major rivers and their tributaries have their headwaters outside
Bangladesh as shown in Fig.1, with about 90% of their annual flow originating outside thecountry. This flow has a huge annual variation, with the combined flow of the Ganges and theBrahmaputra typically increasing from less than 10,000 cumecs early in the year to a peak of
80,000 to 140,000 cumecs by late August to early September. Shortage of water in the dry
season in Bangladesh is exacerbated by the diversion of water at the Farakka Barrage, just
upstream of where the Ganges enters Bangladesh. The country contains about 22155 km ofriver length for about 700 rivers. The river system of Bangladesh is shown in Fig.2.Rivers
and water bodies occupy about 5% of the land surface. The land topography is almost flatwith little hilly areas in the southeastern part.
The country enjoys tropical monsoon climate with two prominent seasons; dry season(November-May) and wet season (June-October). Bangladesh is predominantly an
agricultural country; about 54% of the lands are used for crop production. Up to 85% of theannual rainfall occurs between June and September. Mean annual rainfall ranges from about1200 mm in the west to almost 6000mm in the northeast. The average annual rainfall in the
Himalayas and in the Meghalaya hills to the north of Bangladesh reaches about 10,000mm.
About 25% of the country is flooded to varying degrees each year during May throughSeptember when over 60% of the cereals is produced. Recurrent flooding severely restricts
the farmers’ choice of cropping to traditional low yielding broadcast variety of rice that can
thrive in deep water and, in fact, the coverage is dominated by it. The real production
potential is not harnessed due to flood depth. On the other hand, scarcity of irrigation water
during March-April limits the cultivation of High Yielding Variety rice which accounts forabout 36% of total rice production.
2.2 Bangladesh’s problems as a Lower Riparian in the Basins
As the lower riparian of the major rivers, Bangladesh is located at the point of concentration
for monsoon floods generated by runoff from the Himalayas. Continued development ofupstream basins will increase the disadvantages of being the lower riparian and floods arelikely to increase because of deforestation of the Himalayas, land degradation and erosion.
On the other hand, during the October-May lean period Bangladesh receives only the residual
flow after diversion and upstream use. Reduction of dry season flows in Bangladesh due toincreasing upstream withdrawal is causing severe water shortage across the country and in
the South West region in particular, reduced stream flow is also aggravating salinity intrusionand environmental degradation.
2.3 Agricultural information
The landscape of Bangladesh is broadly grouped into three land forms. These are hill areas
accounting for 12%, terrace areas covering 8%, and floodplain areas covering 80%. Totalland areas of Bangladesh are 14.8 million hectares of which 9.5 million hectares are available
for cultivation and 7.5 million ha of land are subject to potential irrigation. Six million ha aresubject to flooding ranging from 30 cm to in access of two meters. The time of arrival, depth,
duration of flooding and the rate of rise largely determine the choice and timing of crops.
Diversified cropping pattern is in practice in Bangladesh from time immemorial. Cropping
patterns is essentially rice based and most non-rice crops are grown in sequence with rice in
one or even two seasons. Apart from different varieties of seasonal rice, non-rice crops
grown in the country include nearly a hundred types of fruits, vegetables, pulses, oilseeds,
spices, jute, sugarcane, potato, tobacco, millets, wheat etc. Agro-climatic condition in thekharif season (April-July/August) acts in favor of rice, non-rice crops with the exception of
jute can not be grown in these seasons. Most non-rice crops are grown in the rabi season(December-May) when hydrological regime is one of the major factor in the selection of crop
type.
3. Sources of water in Bangladesh
In Bangladesh, the sources of water are surface water and ground water. Both the sources
may be fresh or saline.
3.1 Surface water
Surface water sources are categorized as rainfall, transboundary flow, water on standing
water bodies (water storage in reservoir, water bodies such as river, lake and pond), water on
seasonal wetlands, and in-stream storage. These are describes below:i) Rainfall
Average annual rainfall of the country is about 2360 mm (1960-1997). Yearly variation ofannual rainfall is shown in Fig.3. Regional distribution of annual rainfall is shown in Table 1.
This table shows that northwest and southwest region of the country receives less rainfall
compared to other parts. About 20% of the average annual rainfall occurs in dry season(November-May) in northwest region but the monthly distribution of this amount is highly
uneven.
ii) Transboundary flow
Bangladesh shares 57 transboundary rivers, 54 incoming from India, 3 from Myanmar.
Among the rivers, the Ganges, the Brahmaputra and the Meghna drain about 1.08 million
sq.km., 0.58 million sq.km. and 0.09 million sq.km. respectively. Total annual volume ofwater that enters into the country from the transboundary rivers is about 1000 billion cubic

meter. Though this amount seems high, its contribution in the critical month of February is
only 1% of the total showing the vulnerability of the transboundary flow to meet the water
demand during dry season. Striking features of the transboundary flow is the difference
between the peak flow and the lean flow as shown in Table 2.
In almost all the shared rivers, except the three major rivers, no flow situation prevails duringdriest period of the year. Crucial issue of the transboundary flow is the diminishing values ofthe lean season inflow to Bangladesh. Due to indiscriminate and unilateral upstream
withdrawal of water of common rivers during lean period when the country needs it (inabsence of any rainfall), a water crisis situation is prevailing in Bangladesh. The southwest
part (Ganges Dependent Area) of the country is the most affected region due to upstream
withdrawal of the Ganges at Farakka where irreversible environmental degradation ishappening. Peak monsoon flow is often causing flood in Bangladesh. In normal year, about
20% of the country is inundated which in extreme cases may rise up to 60% (example 1987,
1988, 1998 flood).
iii) Water on standing water bodies
In addition to natural rivers, water is retained in localized low pockets (beels/baors) andponds in dry season. Kapatai lake is the lonely reservoir in the country that has storage
capacity. Total volume of such standing water bodies is about 0.61 billion cubic meter.
iv) Water on seasonal wetlands
Floodplains (about 80% of the total area of the country) become seasonal wetlands during
monsoon (July-October) because of slow drainage of huge transboundary flow and local
rainfall excess. The seasonal wetlands remain inundated from a few days to as long as several
months (May-November). Estimated volume of water stored in these seasonal
wetlands/floodplains is about 2.69 billion cubic meter. This seasonal storage has virtually nocontribution during dry season.
v) In-stream water storage
The numerous channels criss-crossing the entire country, in flowing stage, store water tillthese are completely dries. Estimated volume of channel storage is of the order of 0.5 billion
cubic meters.
3.2 Groundwater
The main source of ground water is the recharge from surface water. Most of the areas of
Bangladesh have been formed from the sedimentary alluvial and deltaic deposits of threemajor rivers. These alluvial deposits have formed mainly an unconfined aquifer for most of
the area of the country. Groundwater was supposed to be one of the major natural resourcesof the country except the safe drinking water supplies. But the presence of Arsenic in shallow
aquifer has completely changed the situation. It is estimated that about 16% of present
population of 123.15 million is exposed to arsenic contamination exceeding Bangladesh
standard (0.05 mg/l). About 74452 sq.km. of groundwater use area (about 50% of thecountry) is unsuitable for use by hand tubewells (as a source of drinking water according to
WHO standard) due to arsenic.
The volume of water occupied by the important sources is shown in Table 3.
4. Water availability and problems

4.1 Surface water availability and problems
The natural surface water resources in Bangladesh are mainly derived through the major river
systems and their tributaries. The flow distribution characteristic in the river system is acombination of upstream inflows and run-off generated from rainfall within Bangladesh. In
the southern regions, the distribution is also affected by tidal conditions.
Surface water is abundant in the wet season in Bangladesh. An estimated 795,000 million
cubic meter (Mm3) of surface water is discharged per year through the Ganges-Brahmaputra
system, in the downstream of the confluence of the Ganges and the Brahmaputra. This isequivalent to 5.52m deep water over a land area of 144,000 km2. There are other rivers
discharging surface water into the Bay of Bengal. In dry season country suffers from acuteshortage of both surface and groundwater (BUET, 2004).
Bangladesh experiences four main types of floods: monsoon floods from the major rivers;
local flooding due to drainage congestion, flash floods in the eastern and northern rivers;
floods caused by high tides and storm surges in the coastal areas. During the June-September
monsoon, Bangladesh receives about 80% of annual precipitation, averaging 2300mm, butvarying from as little as 1200mm in the west to over 5000mm in the east. Runoff fromadjacent riparian is generated by rainfall which averages 5000mm over the Himalayas, andexceeds 10,000mm over the Meghalaya plateau north to Sylhet. Together inflows and rainfall
causes peak floods in the Ganges, Brahmaputra and Meghna rivers in the period July-August,and on average 22% of the country is flooded annually.
Drought is also a problem in Bangladesh, particularly in the North West regions during thespring where there are few surface water resources, and agricultural production is heavily
reliant on groundwater resources. However, drought is not only confined to the dry season,and scanty rainfall during the monsoon, as happened in 1994, but also severely affects
floodplain fisheries and late monsoon aman rice. Groundwater recharge for the following dry
season is also adversely affected.
4.2 Groundwater availability and problems
Groundwater is the main source of water supply in urban and rural areas of Bangladesh.
Except for few hilly regions Bangladesh is entirely underlain by water bearing aquifers at
depths varying from zero to 20m below ground surface. Groundwater in Bangladesh isavailable in adequate quantity, but the availability of groundwater for drinking purposes has
become a problem for the following reasons (BUET, 2004):
•
•
•
•
•

Arsenic in groundwater;
Excessive dissolved iron;
Salinity in the shallow aquifers in the coastal areas;
Lowering of groundwater level;
Rock/stony layers in hilly areas;

So, it may be said that in spite of heavy rainfall, readily accessible groundwater and large
river systems in this country, at present water scarcity for drinking purpose is the major
problem in Bangladesh due to arsenic contamination in groundwater and surface waterpollution by point sources and non-point sources.
4.3 Water resources development

On an annual basis, the water theoretically available to Bangladesh is huge in relation to
demands. The annual rate of reference crop evapotranspiration (ET0) is around 1500 mm/year
and the annual average rainfall is some 2200mm. In addition, a volume of some 1010 Billion
m3 enters the country in the 57 rivers which cross its border with India and Myanmar, whichcorresponds to a further 6800mm over its surface of 147,570 km2, for a total of 9000mm, fourtimes ET0. Regional balance of rainfall and evapotranspiration as presented in Table 4 showswater abundance in wet season and shortage in dry season.
The surface water available for development in the regional rivers in the dry season(November to May) was estimated by the Master Plan Organization (MPO) for the period
1989-1990 as shown in Table 5.
These figures are small when divided by the net cultivable area (NCA in Mha) in each region,and compared with ET0 as shown in Table 6. In the South West, the surface water available
in March of 7 mm and the dependable rainfall of 27 mm, together amount to only 22% of ET0.
However, there is a large groundwater reservoir, which is replenished by monsoon rainfall
and flooding, and is tapped by shallow tubewells (STW) in the dry season.
5. Water demand and supply
Demands arise from several factors such as, natural (evapotranspiration), water supply,
irrigation, fisheries and livestock, industrial, navigation and the environment (demands forsalinity control). Proportion of total water demands, as projected for 2025, is estimated to be:
instream-56%, agriculture-32%, environment-9% and water supply-3%. So, consumptive use
comes to be 44%. Environmental flow requirements according to IUCN as stated by Saleh(2003) should at least be 30% of the world’s river flows so as to maintain a fair condition of
freshwater ecosystems.
If we compare the rainfall and reference crop evapotranspiration we can see the situation ofwater demand and supply. The reference crop evapotranspiration and rainfall during thecritical months (when it exceeds the rainfall) is given region-wise in Table 7, which showsthat supply of water in the driest periods in the whole country is much less than demands.
Water demand for agriculture amounts to about 70% of the global withdrawal; for
Bangladesh, the figure is about 80% (November to March withdrawal). Water use in
Bangladesh agriculture has increased by 2.73 times in 2001 relative to 1991 according to
IRRI as reported by Saleh (2003).
Water balance, on yearly basis, shows a clear deficit for the entire country. This picture
would be alarming if the same is done for driest period of the year. In the absence ofsignificant storage for water in Bangladesh, water balance calculations are normally made ona monthly basis. Table 8 shows the projected demand and supply in the month of March in2018 according to MPO (1991). Still the projected water supply is found to be less thandemand.
6. Water conservation and regional development options
Water conservation is necessary for agriculture, hydro-power and recreation, environment
and preservation of wetlands. Bangladesh’s overall agricultural policy objective is to expand

and diversify agricultural production and to maintain food security, especially with regard tosustaining near self-sufficiency in rice. Irrigation has been the major water sector contributor
to agricultural growth. Groundwater irrigation is limited to about 56% of the country and themain concerns are whether this will need to be curtailed due to possible arsenic
contamination. Surface water is the cheapest form of irrigation providing water is available
nearby in sufficient quantities. It is applicable to 44% of the country where groundwater is
not available and to those parts of the groundwater areas where deficits may be expected due
to low recharge or arsenic limitations.
Most of the NE, SE and SW regions are dependent upon surface water. Parts of the NW and
NC regions would also require surface water. First priority can therefore be assigned todevelopment of surface water resources in the SW by utilizing Ganges waters and second to
the NE and SE regions by utilization of Meghna waters. Through the development ofbarrages on the Jamuna, Ganges and Padma can conserve water resources to use in the dry
season. Such development in the Eastern Hills is also needed as this region has little
groundwater. Higher dry season water levels in the reservoir will ensure lower irrigationwater pumping costs, rises in dry season groundwater levels in land adjacent to the reservoir
and increased water level will increase water retention of ponds adjacent to river.
Region-wise water-related issues has been sorted out in National Water Management Plan as
presented in Table 9 so as to address them in the future.
National Water Policy has been undertaken to address the above issues by:••••Harnessing and development of all forms of surface and ground water andmanagement of these resources in an efficient and equitable manner
Ensuring the availability of water to all
Accelerating the development of sustainable public and private water delivery
systems
Developing a state of the art knowledge and capability that will enable the country todesign future water resources management plans

Water Resources Planning Organization (WARPO) is an organization, which was created in
1992 to perform planning of water resources by:••••

Preparing environmentally compatible master plan for water resources development
Formulating strategy and policy for scientific utilization and conservation of water
resources
Assisting the organizations/agencies involved in utilization, conservation anddevelopment of water resources, in conducting studies and, if necessary, to conduct
special studies on any related issueCollecting and analyzing data and information on water resources and arrange fordissemination

7. Conclusions
Due to its geographical location, Bangladesh experiences water abundance in the wet season
and lack in dry season. These are two major conflicts in water resources management of thecountry. These two major conflicts can be overcome by conserving required amount of waterin the wet season by building more barrages across the rivers as well as by dredging or bydeveloping the rivers and spilling additional amount. The water conservation practice in
Bangladesh still needs attention as the country is geographically dislocated. Moreover,cooperation among the co-basin countries is necessary for sharing of Transboundary riverflows. For instance, if appropriate measures are not taken urgently to restore Bangladesh’s
rightful share of the Ganges, it may face further morphological and environmental hazards
especially in the southwestern part of the country. Diversion of water in Meghna at the Barakdam could have effects on the eastern region. Efficient water and flood management andassured shares of the dry season flows of the Transboundary Rivers have, therefore, become
imperative for the survival of Bangladesh. Interception of flood waters by upstream storage iscrucial need for augmentation of dry season flow, power generation, comprehensive
development and harnessing of water resources of Bangladesh.
8. Recommendations
As the lower riparian state of three major river systems, Bangladesh should work with its
neighbors towards overall basin management, with an early focus on the differenthydrological regions and promoting information exchange. Although Signature of Ganges
Water Treaty in 1996 is an important milestone, continued efforts are needed to secure
Bangladesh’s share of the flows of the other 53 transboundary rivers. The National Water
Management Plan has to address and balance the conflicting needs of too much water inmonsoon and too little in the dry season which would need tapping the resources of both
surface and ground water.
Acknowledgements
The authors are grateful to Water Resources Planning Organization (WARPO) for supplying
the necessary data and information for preparing this paper.
References
Ahmed, M. F., 1999. Rainwater harvesting potential in Bangladesh, Proceedings of the
WEDC Conference on Integrated Development of Water Supply and Sanitation, Addis Ababa,
Ethiopia, 363-365.
BUET, 2004. Water Supply Situation Analysis, Online Publication (URL:
http://www.buet.ac.bd/itn/publications/as_mitigation/as_mitigation_part4_2.pdf), Bangladesh
University of Engineering and Technology, Dhaka, Bangladesh.
MPO, 1991. National Water Plan, vol-2, Master Plan Organization, Ministry of Irrigation,
Water Development and Flood Control, Government of the People’s Republic of Bangladesh.
Saleh, A.F.M., 2003. Lecture notes on Water Management and Agriculture, Short course on
Integrated Water Resources Management, BUET, Dhaka, 18pp.

Table 1: Rainfall of the country, mm
SeasonWet
DryAnnualRegion of the country
NW
NC
NE
1393
1445
2297
346
511
897
1739
1956
3194

Average
SW
1299
366
1665

SC
1821
486
2307

SE
1683
588
2271

EH
1934
511
2445

1856
504
2360

NW-North West, NC-North Central, NE-North East, SW-South West, SE-South East, SC-South Central, EHEastern Hills

Table 2: Peak and lean flow in the major rivers
River

StationGangesBrahmaputra
MeghnaHardinge
Bahadurabad
Bhairab Bazar

Peak flow(m3/s)
76000
102534
19800

Lean flow(m3/s)
526
2860-

Lean flow(% of peak)
0.7
2.79
-

Table 3: Volume of water occupied by the important sources
SourceVolume inmillion cubic meter
Volume in percent

Transboundary
1,050,000

Rainfall343,000

Groundwater
23,000

74%

24%

2%

Table 4: Regional balance of rainfall and evapotranspiration
RegionNW
NE
SW
SE

Rainfall, mm
Wet
Dry
1881
156
2594
368
1792
183
2661
260

Evapotranspiration, mm
Wet
Dry
795
679
776
700
816
719
866
785

Deficit, mm
Wet
-1116
-1818
-974
-1795

Dry
523
432
536
525

Table 5: Surface water available for development in volume (1989-1990)
Surface water available for development (Mm3)
Region
Nov
Dec
Jan
NW
2,970
1,840
1,160
NE
5,090
1,710
710
SE
820
950
750
SC
8,250
4,440
3,050
SW
1,180
580
270
Total
18,310
9,520
5,940

Feb
780
130
640
2,020
140
3,710

Mar
780
230
650
2,320
120
4,100

Apr
920
2,480
630
3,760
100
7,980

May
2,210
9,680
1,090
7,680
230
20,890

Table 6: Surface water available for development in depth (1989-1990)
Surface water available for development (mm on cultivable area)
RegionNCA Nov Dec
Jan
Feb
Mar
(Mha)
NW
2.451 121 75
47
32
32

Apr

May

38

90

NE
SE
SC
SW
ET0

2.573
1.313
1.026
1.666
-

198
62
804
71
102

66
72
433
35
87

28
57
297
16
88

5
49
197
8
107

9
50
226
7
155

96
48
366
6
175

376
83
749
14
180

Table 7: Regional monthly ET0 and Rainfall (mm)ET0/Rainfall Nov
Region
SE
80/39
NW
79/12
NC
80/23
RT
83/38
SW
84/31
NE
78/32
SC
81/53
EH
88/59

Dec

Jan

65/11
65/7
66/11
70/11
72/11
65/13
71/11
79/11

Feb
70/6
67/8
70/6
74/6
76/9
68/9
75/7
85/5

Mar

86/24
85/11
87/21
90/20
92/23
85/31
90/23
98/17

132/60136/22
136/40136/48145/36
128/82
135/46140/44

Apr
164/72
159/127
157/130
173/80152/115
153/124

Table 8: Projected water supply and demand in the month of March
Projected water supply and demand, March 2018 (MPO 1991)
Water requirements
Mm3%
Water supplies
Agriculture
14,29058.6
Main rivers
Navigation,
9,910
40.7
Regional rivers
Environment
andFisheries
Domestic uses and 170
0.7
Groundwaterindustry
Total
24,270
100
Total

Mm3
11,740
6,390

%
50
27

5,360

23

23,490100

Table 9: Region-wise water-related issues
RegionSW

IssuesPreservation of the Sundarbans, restoration of dry season fresh water inflows,
maintenance of the coastal embankment system, alleviation of coastal drainage
congestion, improved cyclone protection, flood proofing in the low lying areas
NE
Environmental management of the Haor basin, flood proofing, erosion of old
Brahmaputra left bank, drainage congestion in the rivers, hill irrigation
NC
Bulk water supplies and pollution control in Dhaka city, flooding and drainage
problems, flood proofing in low lying areas
NW
Erosion along the right bank of the Brahmaputra, flooding and drainage problems,
drought in the western fringes, flood proofing in the low lying areas
SC
Siltation and drainage congestion, improved cyclone protection, flood proofing in
low areas
SE
Gaseous aquifers, cyclone protection, drainage congestion, protection of newly
accreted lands against tidal flooding
Eastern
Small scale irrigation development, mini-hydro power development, improved
Hills
cyclone protection,
Rivers and Erosion protection, regional augmentation, flood proofing, cyclone protection in
Estuary
Meghna estuary, erosion of Meghna river, protection of newly accreted lands

Fig.1 The Ganges-Brahmaputra-Meghna river basinsFig.2 River systems in Bangladesh

Average Rainfall
RAINFALL PATTERN

Fig.3 Variations of annual rainfall in Bangladesh(Source: Ahmed, 1999)