FloodsMap.com
Global ViewMegadelta Monsoon Plain

Bangladesh Delta & Monsoon River Basins

Bangladesh flood map platform tracks transboundary river flows across the Ganges-Brahmaputra-Meghna basins, summer monsoon crests, and Bay of Bengal cyclonic storm surge vulnerabilities.

Primary Threats:Brahmaputra, Ganges & Meghna Transboundary Peak FloodingBay of Bengal Cyclonic Storm SurgesHaor & Wetland Flash InundationActive Riverbank Erosion & Sediment Displacement

Loading High-Resolution Radar & GIS Engine...

Mean Elevation
30 ft ASL
Coastal Exposure
360 Miles
High-Risk Parcels
15 Million+
Monitored Metros
5 Zones
Topographic & Hydrological Profile

Why Bangladesh Floods: Geological Inundation Mechanics

Bangladesh forms the largest delta system on Earth, sculpted by the confluence of the Ganges (Padma), Brahmaputra (Jamuna), and Meghna rivers. The total catchment area exceeds 1.72 million square kilometers, of which only 7% lies within Bangladesh's borders—meaning the country must process transboundary rainfall and Himalayan meltwater from India, China, Nepal, and Bhutan. More than 80% of Bangladesh consists of low-lying deltaic floodplain with a mean elevation under 30 feet above sea level. Furthermore, the funnel-shaped coastline of the Bay of Bengal amplifies tidal storm surges to heights exceeding 20 to 30 feet during pre-monsoon and post-monsoon tropical cyclones.

Bangladesh Key Metropolitan Risk Tiers

Elevations above sea level, coordinates, and predominant FEMA/regional flood classifications.

Dhaka (Buriganga Basin)
13 ft ASL•Riverine Floodplain
High
Chittagong (Karnaphuli Port)
20 ft ASL•Coastal Storm Surge
High
Khulna / Sundarbans
7 ft ASL•Tidal Coastal Inundation
Extreme
Sylhet / Sunamganj (Haor)
35 ft ASL•Flash Flood Basin
Extreme
Barisal (Coastal Delta)
5 ft ASL•Tidal Surge & Delta
Extreme
Historical Benchmarks

Major Catastrophic Flood Disasters in Bangladesh

20221.2m Above Danger Level

Greater Sylhet Flash Flood

Extreme rainfall in the upstream Meghalaya hills caused sudden, unprecedented flash flooding across 90% of Sunamganj and Sylhet districts.

1998Record 70-Day Deluge

Centennial Megaflood

Simultaneous cresting of the Ganges and Brahmaputra submerged over 68% of the country for 70 consecutive days, affecting 30 million people.

199120.0 ft Cyclonic Surge

Super Cyclone 02B

Catastrophic 20-foot cyclonic storm surge swept across coastal islands and Chittagong coastal belt, claiming over 138,000 lives.

Regional Underwriting & Regulatory Mandate

Flood risk mitigation in Bangladesh relies on national early warning telemetry from the Flood Forecasting and Warning Centre (FFWC), a network of over 139 coastal polders (enclosed embankments), and multi-purpose cyclone shelters rather than private insurance markets.

People Also Ask (Bangladesh)

Frequently Asked Questions About Bangladesh Flood Maps

State-specific answers on flood insurance regulations, storm surges, and high-risk elevation certificates.

Because 93% of the Ganges-Brahmaputra-Meghna catchment area lies outside Bangladesh in upstream Himalayan countries. When heavy monsoon rains strike northern India and Nepal, the vast volume of water drains through Bangladesh's flat terrain toward the sea, inundating floodplains.
Explore Other Vulnerable Coastal & Delta Hubs

Compare Bangladesh flood risk against other critical regions worldwide.

FloridaLouisianaTexasNetherlandsUnited KingdomVeniceJakartaMekong Delta