Bangladesh's Wetlands Under Pressure: Water Resources and Haor Ecosystems

Bottom Line

Bangladesh's water sector composite score of 87.4/100 (moderately healthy)

reflects three structural failures operating simultaneously: transboundary

dependency at 85.5/100 (risk rated critical), 56+ rivers

classified as polluted by DoE, and 20.0% of tube wells arsenic-contaminated.

The 1996 Ganges Water Sharing Treaty expired in 2026 with no successor agreement

signed, eliminating the sole legal guarantee of dry-season flow from Farakka. A

60% dry-season flow deficit on the Teesta persists unresolved.

These are not water management failures; they are diplomatic, enforcement, and

governance failures with water consequences. The policy response must be

calibrated accordingly.

Base case: With the Ganges Treaty unrenewed and Teesta unresolved,

dry-season agriculture in northern Bangladesh faces sustained stress. The

5,000 km of BWDB embankments protect settled land but do not compensate

for upstream diversion losses. Gradual pressure on the 8.0 million

ha wetland system continues, eroding the 40% wetland share of the

national fish catch and threatening livelihoods for 20 million haor

residents.

Risk case: Failure to conclude Ganges Treaty renewal before India's next

general election cycle hardens positions for a decade. Combined with accelerated

groundwater depletion and sea-level-driven saline intrusion in coastal districts,

the compound stress could breach agricultural resilience thresholds in Rajshahi

and Rangpur divisions within five to seven years.

Water Resources Position

Bangladesh's 700+ rivers carry 1,105 billion cubic meters of

surface flow annually, making it one of the most water-abundant nations by volume.

However, the overwhelming majority of that flow originates upstream in India, China,

Nepal, and Bhutan; Bangladesh is almost entirely a lower riparian state with minimal

headwater control. That structural dependency defines Bangladesh's water situation

more than any domestic policy variable.

Per capita renewable availability stands at 7,872 m3/year, classified

as "no stress" under the Falkenmark indicator (threshold: 1,700 m3/capita for

water stress). Long-term trend data are unavailable, as population growth progressively

dilutes a fixed natural endowment. The national average obscures a structural

north-south split: the Barind Tract in Rajshahi and Rangpur experiences

near-scarcity conditions from November to April, when river flows fall 80-90%

below monsoon peaks and farmers depend on groundwater that is being drawn down

faster than it recharges.

Agriculture accounts for 11.2% of GDP and is the economy's primary water

consumer. The sector's exposure to seasonal water stress is not bounded by this

figure; rural employment and food security multiply the downstream risk. GDP

growth of 4.2% requires continued agricultural output, which in turn

requires water availability that upstream diplomacy, not domestic investment, will

ultimately determine.

Peer comparison: Vietnam, operating on the Mekong with comparable upstream

dependency, secured a 1995 multilateral framework and data-sharing protocols

before diplomatic relations with upstream states deteriorated. Egypt on the Nile

achieved binding flow guarantees through the 1929 and 1959 treaties. Bangladesh

has neither a multilateral framework nor a successor to the 1996 Ganges Treaty.

Transboundary Exposure: The Defining Risk

The Ganges Water Sharing Treaty of 1996 guaranteed Bangladesh a minimum

dry-season allocation of 35,000 cusec at Farakka. The treaty ran

30 years and its expiry in 2026 without replacement removes the only legal

constraint on Indian diversions. No automatic renewal clause exists. India's

Interlinking of Rivers program, which would divert Himalayan surplus to Peninsular

India, would structurally reduce flows to Bangladesh regardless of bilateral

goodwill.

The Teesta represents the harder negotiating problem. A 2011 draft agreement

allocating flows between India and Bangladesh was blocked by West Bengal's state

government and has not been revived at the central level. The consequence is a

60% dry-season deficit that directly reduces boro rice yields in

Rangpur Division and has driven farmers to groundwater extraction that is

depleting aquifers not designed for that load.

Bangladesh shares 54 common rivers with India. The Joint Rivers Commission,

established 1972, has produced one treaty in over 50 years. That record indicates

structural constraint, not negotiating failure, and the appropriate response is

to supplement bilateral channels with multilateral pressure, third-party

arbitration clauses, and upstream engagement with Nepal and Bhutan on storage

cooperation that benefits all downstream riparians.

Wetlands and Ecosystem-Based Assets

The 8.0 million ha wetland system, anchored by 1,990,000 ha

of haors in the northeast, underpins protein security for a country where fish

is the dominant source of animal protein. Wetlands supply 40% of the

national fish catch (DoF); the 20 million people living within the haor basin

depend on this directly for food and income.

Bangladesh holds 2 Ramsar sites: the Sundarbans (6,017 km2,

the world's largest contiguous mangrove forest) and Tanguar Haor. The Sundarbans

provides storm surge attenuation, carbon sequestration, and coastal fishery

nursery functions that coastal protection infrastructure cannot replicate. Reduced

freshwater inflow from the Farakka Barrage is increasing salinity within the

Sundarbans, stressing species composition and accelerating die-off of

freshwater-dependent vegetation.

Wetland conversion has accelerated through drainage for boro rice cultivation,

floodplain embankment construction, urban encroachment, and upstream siltation.

The economic logic driving conversion is straightforward: boro rice in drained

beels yields a predictable seasonal return while the wetland's fishery services

are diffuse and unpriced. Correcting this requires explicit economic valuation of

wetland ecosystem services and regulatory instruments that internalize those values.

River Pollution: A Municipal and Industrial Governance Failure

56+ rivers classified as polluted by the Department of Environment

represent a governance failure, not a technical one. The Environment Conservation

Act (1995, amended 2010) provides the legal basis for pollution control; DoE

lacks the enforcement staff, laboratory capacity, and political support to apply

it. Dhaka's four surrounding rivers (Buriganga, Turag, Balu, Shitalakkhya)

receive industrial effluent from tanneries relocated to Savar without an adequate

central treatment facility, textile dye houses in Gazipur and Narayanganj, and

untreated municipal waste. Dissolved oxygen in these rivers drops to near zero

during the dry season; biological productivity is effectively zero.

Arsenic affects 20.0% of tube wells, a chronic public health condition

concentrated in southern and southeastern districts where shallow aquifer geology

elevates natural arsenic levels. Access to improved water sources reaches

98.0% nationally (JMP), but "improved source" does not equal safe

water. Only an estimated 60-65% of water points meet all Bangladesh Drinking

Water Standards parameters (DPHE estimate). The gap between coverage and quality

is widest in rural areas where arsenic-safe alternatives (deep tube wells,

piped systems) have not achieved full penetration.

Flood Infrastructure: Diminishing Returns Without Reform

The BWDB operates 5,000 km of embankments built primarily between 1960

and 1990. This infrastructure has prevented catastrophic settlement losses but

severed river-floodplain connectivity, reducing fishery productivity, accelerating

within-channel sedimentation, and eliminating the nutrient deposition that

sustained soil fertility before embankment construction. The net ecological cost

of the embankment system has not been formally quantified and should be.

The Tidal River Management (TRM) approach in the southwest, which restores

controlled seasonal flooding to beels, demonstrates that river-floodplain

reconnection is practically achievable. Scaling TRM and applying analogous

approaches to haor flash-flood management represents the viable adaptation

direction; extending embankments does not.

Climate projections (Bangladesh Delta Plan 2100) add compounding pressure:

10-15% higher monsoon precipitation by 2050, declining dry-season base flows as

Himalayan glaciers retreat, and 0.5-1.0 meters of sea-level rise by 2100 pushing

saline intrusion further inland. These changes require transformative adaptation

policy, not incremental embankment extension.

Drinking Water Quality: The Access-Safety Gap

The 98.0% improved-source coverage rate understates the actual

safe-water gap. The critical unresolved problem is water quality within the

improved-source category: arsenic, iron, manganese, salinity, and microbial

contamination all breach safe limits at a significant share of technically

"improved" points. The WASH sector needs a shift from access measurement to

quality-verified access measurement, which DPHE's monitoring system does not yet

systematically produce.

Sanitation has a parallel structure: open defecation has been largely eliminated,

but safely managed sanitation (containment, emptying, transport, and treatment

of fecal waste) remains far below universal coverage. Dhaka's sewerage network

covers a small fraction of the city. The gap is structural and will not close without

capital investment of a scale that requires multilateral financing.

Priority Recommendations

**1. Negotiate a package Ganges-Teesta-shared rivers agreement before the 2027

Indian electoral cycle**, treating the three as a linked set to create exchange

value across issues. Technical confidence-building measures (real-time flow

data sharing, joint monitoring stations at Farakka and Gazaldoba) should precede

and accompany political negotiations, not follow them. Engage Nepal and Bhutan on

upstream storage cooperation that reduces India's own flood risk, creating a

coalition interest in regional basin management. The Mekong River Commission's

data-sharing architecture, despite its enforcement limitations, provides a

replicable model for the GBM basin.

2. Launch a phased National River Pollution Abatement Program, starting with

the 56+ DoE-classified rivers and prioritizing Dhaka's four (Buriganga,

Turag, Balu, Shitalakkhya) where tannery relocation has already occurred but

treatment remains inadequate. The program requires mandatory effluent treatment

for all industrial categories, combined sewerage-treatment infrastructure for

riverside towns, and continuous real-time water quality monitoring with public

disclosure. Financing mechanism: enforce the polluter-pays principle embedded in

the Environment Conservation Act through graduated discharge fees, with proceeds

capitalized into a Pollution Abatement Fund. South Korea's Cheonggyecheon

restoration and the Thames cleanup confirm that urban river recovery within one

generation is achievable when enforcement is genuine.

3. Enact a National Wetland Protection and Valuation Framework that maps,

classifies, and assigns legal protection to all wetlands above a defined area

threshold, with explicit economic valuation of ecosystem services integrated into

project approval calculations. Immediate actions: extend Ramsar designation to

Hakaluki Haor and Chalan Beel; enforce the Wetland Conservation Act 2023; and

establish community co-management for haor fisheries modeled on the Tanguar Haor

experience. The arsenic response requires a parallel capital program: full

replacement of arsenic-affected tube wells in the highest-burden districts with

deep wells or piped alternatives, targeted to complete coverage in the 20 highest-

prevalence districts within five years.

*Sources: World Bank WDI, BWDB, JRC Global Surface Water Explorer, Ramsar

Convention Secretariat, DPHE, DoE, WARPO, IUCN Bangladesh, UNICEF/WHO JMP,

Bangladesh Delta Plan 2100.*