Flood protection: A natural defense system

Globally, mangroves provide an estimated $855 billion in flood protection services, according to the research of Center for Coastal Climate Resilience at UC Santa Cruz. The Sundarbans itself plays a pivotal role in this contribution, offering irreplaceable protection to Bangladesh’s vulnerable coastal areas, where densely populated communities face recurring threats from cyclones and flooding. Its value extends far beyond national borders, exemplifying the critical importance of preserving such ecosystems for global climate resilience. The Sundarbans, spread over 6000 square kilometers in Bangladesh and about 4000 square kilometers in India, is a critical shield against floods and cyclones for the densely populated coastal regions of Bangladesh. Using advanced flood risk models, researchers have shown that mangroves, such as those in the Sundarbans, reduce storm surges and protect lives, livelihoods, and infrastructure.

The research, conducted by project co-lead, Pelayo Menendez and center director, Michael W. Beck, is featured in the World Bank’s 2024 edition of The Changing Wealth of Nations. As highlighted by the research, the value of mangroves for flood-risk reduction has grown exponentially due to rising coastal populations and increasing climate threats. For Bangladesh, which experiences frequent cyclones, the Sundarbans is a natural barrier that significantly mitigates the impact of these disasters. The devastating Cyclone Sidr in 2007 serves as a stark reminder of how mangroves save lives—areas with dense mangrove cover reported fewer casualties and less infrastructure damage. Furthermore, these natural defenses minimize the long-term economic losses often associated with such disasters.

Biodiversity and livelihoods

The Sundarbans is a UNESCO World Heritage site, home to iconic species such as the Bengal tiger, spotted deer and countless aquatic organisms. It serves as a nursery ground for fish and crabs, ensuring the sustainability of local fisheries. This biodiversity directly supports the livelihoods of millions of people who depend on fishing, honey collection, and eco-tourism. Beyond these tangible benefits, the Sundarbans also holds immense cultural and spiritual significance for local communities.

However, human activities specially brackish water shrimp farming and deforestation have contributed to the degradation of mangroves. Despite this, studies show that the protective benefits provided by mangroves have grown—protecting 61% more people and safeguarding 109% more capital assets from floods in 2020 compared to a decade earlier. This underscores the increasing reliance on these natural assets for coastal resilience. The Sundarbans’ ecosystem services act as a safety net for many vulnerable communities, making its conservation a matter of both ecological and human survival.

Economic and climate benefits

Mangroves, including the Sundarbans, are crucial for Bangladesh’s climate adaptation strategies. By sequestering large amounts of carbon, they help combat global warming. The Sundarbans plays a key role in reducing the country’s vulnerability to rising sea levels and extreme weather events. Moreover, mangroves offer a cost-effective alternative to artificial infrastructure like seawalls, which require significant financial investments and maintenance.

Sustainable aquaculture is gaining momentum as a means of balancing food security with environmental conservation. In Bangladesh, organization like FISHBYTE, an aqua-tech impact startup pioneering efforts to modernize shrimp farming, enabling higher yields from existing land while integrating mangrove restoration into farming practices. Their innovative approach demonstrates how Bangladesh’s low-yield aquaculture can be transformed into climate-smart solutions, supporting biodiversity, enhancing carbon sequestration and reducing the need for land conversion. By incorporating mangrove plantations into aquaculture systems, it exemplifies how environmental restoration can align with economic development, creating a win-win scenario.

The economic benefits of the Sundarbans extend beyond flood protection. The World Bank’s Changing Wealth of Nations report emphasizes mangroves as natural capital assets with long-term value. For Bangladesh, preserving the Sundarbans is not just an environmental necessity but also a smart economic choice. It safeguards fisheries, promotes tourism, and ensures the well-being of coastal communities. The region’s fisheries, for instance, contribute significantly to local and national economies, underscoring the forest’s role in food security and job creation.

Challenges and the way forward

Despite the Sundarbans’ immense value, it faces threats from illegal logging, industrial pollution, and climate change. Rising salinity and reduced freshwater flow from upstream rivers are deteriorating the forest’s health. Additionally, unchecked industrial activities and unplanned urbanization exacerbate these challenges, putting both the ecosystem and the communities it supports at risk. Bangladesh must prioritize mangrove conservation and restoration as part of its national climate-adaptation policies.

Innovative approaches like integrating mangrove restoration with aquaculture demonstrate how sustainable practices can balance economic needs with environmental conservation. By promoting climate-smart aquaculture and integrating mangrove restoration Bangladesh can address the twin challenges of food security and ecosystem preservation.

Investing in the Sundarbans will yield dividends in disaster risk reduction, biodiversity conservation, and economic growth. Learning from global initiatives, such as the Coastal Resilience Explorer tool developed by the Center for Coastal Climate Resilience, can help Bangladesh implement innovative strategies to protect and expand its mangrove cover. Moreover, community engagement and education are critical to fostering a sense of ownership and responsibility for mangrove conservation among local populations.

Global perspectives and local actions

The Sundarbans is part of a broader global network of mangroves that collectively act as climate regulators and biodiversity hotspots. Countries like Vietnam, India, and Indonesia have implemented successful mangrove restoration programs, offering valuable lessons for Bangladesh. These initiatives highlight the importance of government support, community involvement and private sector partnerships in achieving sustainable outcomes. Bangladesh can draw inspiration from these models while tailoring strategies to its unique socio-economic and ecological context.

International collaboration also plays a pivotal role. As climate change knows no borders, global efforts to fund and support mangrove conservation are essential. Bangladesh can leverage its position as a vulnerable yet resilient nation to advocate for increased international assistance and knowledge-sharing platforms focused on mangrove preservation.

Last but not least

The Sundarbans is more than a mangroves forest; it is Bangladesh’s first line of defense against climate-induced disasters and a cornerstone of its environmental and economic resilience. By recognizing the Sundarbans as a natural asset and integrating its conservation into national development plans, Bangladesh can secure a sustainable future for its people while contributing to global efforts to combat climate change.

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In Lakshmipur, around 40,000 ponds across five upazilas have been swept away, washing thousands of fish into nearby rivers and canals, which has affected more than 300 villages. District fisheries officer Billal Hossain initially estimated the losses about USD 20 million, though the final figure is expected to be higher.

Senior upazila fisheries officer Sarwar Zaman emphasized the dire situation, noting that many local fish farmers have been left financially ruined. He highlighted the urgent need for assistance and mentioned that the issue had been raised with higher authorities.

In Noakhali, the aquaculture situation is similarly catastrophic. Flooding in 83 unions across nine upazilas resulted in the loss of over 85,000 fish and significant damage to fishing infrastructure. According to fisheries officer Iqbal Hossain, the financial loss in Noakhali’s fish farming sector alone is estimated about USD 46 million, with further damages of USD 51 million to additional infrastructure.

Farmers in both districts face extreme financial hardship as they struggle to recover from the destruction. Areas like Begumganj and Companyganj upazilas were particularly hard hit by the floods, leaving thousands of farmers grappling with debt and economic ruin.

The flood’s impact on the aquaculture sector in Noakhali and Lakshmipur underscores the urgent need for governmental intervention and financial relief to support affected farmers in rebuilding their livelihoods.

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The recent floods have caused widespread damage across 86 upazilas in 12 districts, severely affecting 180,819 ponds and fish farms. The estimated losses include 90,768 tonnes of fish and shrimp, as well as 337 million units of fish fry and shrimp post-larvae. The overall damage, including infrastructure losses, is valued at approximately USD 85 million.

In addition to the easy-term loans, the government will implement several other recovery measures. These include enhancing flood forecasting systems, conducting training programs, providing infrastructural support for fish farms, and distributing fish fry using unspent funds from previous activities.

The floods have also inflicted considerable losses on livestock, with an estimated USD 34.5 million in damage due to the destruction of feed and other resources. To address these issues, the government will supply animal feed, distribute vaccines to prevent disease outbreaks, and provide grass cuttings to farmers.

This comprehensive support package is designed to help the flood affected fish farmers to recover quickly and ensure the continued growth of the fisheries and livestock sectors in the flood-affected regions.

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Local residents reported that around 1 PM on Thursday, the WAPDA embankment at the southern end of the 22nd Polder in Kalinagar, Diluhti union, ruptured due to the intense high tide. The breach, spanning over 300 feet, has submerged the villages of Kalinagar, Horinkhola, and Darunmallik. Newly planted paddy fields, seedbeds, and homes have all been flooded.

Despite relentless efforts by locals to repair the embankment throughout the night, strong currents have made restoration efforts nearly impossible. The Shibsa River’s powerful currents have also led to the collapse of the Panikhali embankment in Dakop, resulting in widespread flooding across several villages and fish enclosures.

Additionally, continuous heavy rainfall has caused severe waterlogging in Khulna city. Major roads in areas like Tutpara, Boyra, Nirala, Maulavipara, and Baytipara have been submerged, rendering them impassable.

The Khulna district administration has announced that the Water Development Board has initiated repair work on the damaged embankments to prevent further flooding and damage.

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