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The Bangladesh delta plan: Between certainty and reality
The models were not wrong, exactly. The science was sound. But the models were answering questions that nobody in that room had asked. We had travelled eleven hours to show people a mirror, and the mirror was reflecting something they did not recognise as themselves. It was reflecting us, the...
The Bangladesh delta plan: Between certainty and reality
21 March 2026, 15:00 PM
Willem van Deursen
My colleagues called me the Banana Man.
Not because I was particularly yellow, or easy to peel, but because of the way I ate bananas. I would strip the skin away completely, touching the fruit with my hands. My Bangladeshi colleagues found this endlessly amusing.
"The banana has its own packaging," they said. "Why strip it all away?"
Friendly laughter. Gentle teasing. But looking back now, I think the joke carried a truth I wasn't ready to hear. Perhaps I was always stripping away what was already there, the natural wrapping, the local knowledge, the lived experience, in order to get to what I thought was the essential thing underneath. Perhaps that was my mistake. And perhaps it took me twenty-five years of travelling to Bangladesh to understand it.
The journey itself is not subtle. Eleven hours in the air, then Dhaka. Chaotic, loud, overwhelming, beautiful in its own relentless way. And then, almost immediately, the bubble closes around you: the hotel, the office, the project meetings, the PowerPoints. The familiar rhythm of international development work, which has a way of making every city feel like every other city, as long as you stay inside it.
For years, that was my Bangladesh. I was a solid engineer. I knew the science, I trusted my models, I had the data and the computing power to back up everything I said. I told myself I understood the delta.
I did not understand the delta.
In September 2018, I was part of the Dutch team working on the Bangladesh Delta Plan 2100, a document that dared to think eighty years ahead in a country where cyclones do not wait and policies change quickly. Long sessions. Heated debates. Whiteboards covered in arrows. I survived those sessions on bananas.
We had a remarkable team: Bangladeshi experts, Dutch colleagues, modellers, planners, economists. Those were good days. And yet, even then, something sat at the edge of my awareness. We could talk, we could model, we could laugh together. But this was more their delta than ours. They carried an intimate knowledge, a lived experience that I could never fully access from behind my models.
When the Government of Bangladesh approved the Delta Plan, I felt proud. The Dutch water sector had contributed substantially. At that moment, confidence felt like exactly what Bangladesh deserved.
As a Dutch water professional, I should have been more careful with my enthusiasm.
The moment I truly understood my limits was not dramatic. It was quieter than that, and in some ways more unsettling.
I was sitting with a group of community members in rural Bangladesh. We had our models, our outputs, our maps. I was proud of what we had built.
I watched their faces as we presented.
Typical stages of project development and implementation. Credits: Author
They were polite—Bangladeshi hospitality is genuine and disarming—but something was wrong. They could not recognise what we were showing them. Not because they lacked intelligence, but because we were describing a system that bore little relationship to the system they actually lived in. We were talking about flood risk and hydraulic gradients. They were talking about where their children go to school when the water rises, whether their land would still be theirs next season, how a family decides when to move, when to stay, and what gets left behind either way.
I was speaking the language of the expert. They were speaking the language of experience. Those are not the same language.
The models were not wrong, exactly. The science was sound. But the models were answering questions that nobody in that room had asked. We had travelled eleven hours to show people a mirror, and the mirror was reflecting something they did not recognise as themselves. It was reflecting us, the experts, not them, the locals.
I returned to Dhaka in 2022 for an international conference on the Delta Plan. The halls were full. Slides polished. Words like integrated, transformative, climate-proof floated through the air. And yet something had shifted. The plan that once felt like a national narrative now read like a sector document. The voices of farmers, youth, and local communities were absent.
During a coffee break, I stood at a window overlooking the city. A colleague joined me. We stood in silence for a moment.
"Do you think it will work?" I asked.
He smiled. "Not the way we planned it."
We laughed. Not bitterly, but with something like relief.
This is, I have come to believe, the central problem with the way the Dutch engage with water management beyond our own borders. We arrive carrying assumptions we have never examined. In the Netherlands, floods are fear. Boundaries are rigid: water here, land there. In Bangladesh, floods bring life. Fresh sediments enrich the land. Traditional communities understand the delta as dynamic, fluid. Adaptation is not about stopping the flow; it is about moving along with it.
Sketching the logic, debating the data, and seeking the mandate. Credits: Author
And there is something even deeper we choose to ignore. In the Netherlands, we have an extraordinary trust in government, built over centuries of shared water management, and of knowing that if your neighbour's dike fails, yours fails too. We assume, when we export our solutions, that this social contract travels with them. It does not. In many of the places we work, the relationship between communities and the state is defined not by trust but by abandonment. People have learned to build their own resilience outside of any masterplan, including ours.
When we ignore this, we are not just making a technical error. We are making a human one.
Here is the detail that humbles me most. In one of our projects, we proposed dynamic polder management, allowing controlled flooding, moving with the water rather than against it. The Bangladeshi experts resisted. Too soft. Not infrastructural enough. They wanted embankments, gates, certainty.
Years later, the Netherlands adopted the same approach. We called it dynamic coastal management. Cutting-edge, innovative, distinctly Dutch. Our Gift to the World.
It was the same concept. The same logic Bangladesh had practised for generations.
Perhaps knowledge does not travel in straight lines. Perhaps it travels in loops.
When I returned to Dhaka after the conference, a colleague greeted me with a grin and a bag of bananas.
"For you," he said. "We remember."
It meant more to me than any conference applause.
I am still an engineer. I still believe in models, data, and technical expertise. But expertise without humility is just another way of not listening. And in a world where the people most affected by floods and rising seas are rarely in the room when decisions are made, not listening is not a neutral act.
The most important distance in this work is not the eleven hours between Rotterdam and Dhaka. It is the distance between your certainty and someone else's reality.
Travel the last 100 metres. Sit down. Strip away a little less. And pay attention to what was already there.
Willem van Deursen is a senior integrated water resources expert and founder of Carthago Consultancy, with over 25 years of experience using modeling at the interface of hydrology, policy, and livelihoods to improve people’s lives.
21 March 2026, 15:00 PM
Willem van Deursen
My colleagues called me the Banana Man.
Not because I was particularly yellow, or easy to peel, but because of the way I ate bananas. I would strip the skin away completely, touching the fruit with my hands. My Bangladeshi colleagues found this endlessly amusing.
"The banana has its own packaging," they said. "Why strip it all away?"
Friendly laughter. Gentle teasing. But looking back now, I think the joke carried a truth I wasn't ready to hear. Perhaps I was always stripping away what was already there, the natural wrapping, the local knowledge, the lived experience, in order to get to what I thought was the essential thing underneath. Perhaps that was my mistake. And perhaps it took me twenty-five years of travelling to Bangladesh to understand it.
The journey itself is not subtle. Eleven hours in the air, then Dhaka. Chaotic, loud, overwhelming, beautiful in its own relentless way. And then, almost immediately, the bubble closes around you: the hotel, the office, the project meetings, the PowerPoints. The familiar rhythm of international development work, which has a way of making every city feel like every other city, as long as you stay inside it.
For years, that was my Bangladesh. I was a solid engineer. I knew the science, I trusted my models, I had the data and the computing power to back up everything I said. I told myself I understood the delta.
I did not understand the delta.
In September 2018, I was part of the Dutch team working on the Bangladesh Delta Plan 2100, a document that dared to think eighty years ahead in a country where cyclones do not wait and policies change quickly. Long sessions. Heated debates. Whiteboards covered in arrows. I survived those sessions on bananas.
We had a remarkable team: Bangladeshi experts, Dutch colleagues, modellers, planners, economists. Those were good days. And yet, even then, something sat at the edge of my awareness. We could talk, we could model, we could laugh together. But this was more their delta than ours. They carried an intimate knowledge, a lived experience that I could never fully access from behind my models.
When the Government of Bangladesh approved the Delta Plan, I felt proud. The Dutch water sector had contributed substantially. At that moment, confidence felt like exactly what Bangladesh deserved.
As a Dutch water professional, I should have been more careful with my enthusiasm.
The moment I truly understood my limits was not dramatic. It was quieter than that, and in some ways more unsettling.
I was sitting with a group of community members in rural Bangladesh. We had our models, our outputs, our maps. I was proud of what we had built.
I watched their faces as we presented.
Typical stages of project development and implementation. Credits: Author
They were polite—Bangladeshi hospitality is genuine and disarming—but something was wrong. They could not recognise what we were showing them. Not because they lacked intelligence, but because we were describing a system that bore little relationship to the system they actually lived in. We were talking about flood risk and hydraulic gradients. They were talking about where their children go to school when the water rises, whether their land would still be theirs next season, how a family decides when to move, when to stay, and what gets left behind either way.
I was speaking the language of the expert. They were speaking the language of experience. Those are not the same language.
The models were not wrong, exactly. The science was sound. But the models were answering questions that nobody in that room had asked. We had travelled eleven hours to show people a mirror, and the mirror was reflecting something they did not recognise as themselves. It was reflecting us, the experts, not them, the locals.
I returned to Dhaka in 2022 for an international conference on the Delta Plan. The halls were full. Slides polished. Words like integrated, transformative, climate-proof floated through the air. And yet something had shifted. The plan that once felt like a national narrative now read like a sector document. The voices of farmers, youth, and local communities were absent.
During a coffee break, I stood at a window overlooking the city. A colleague joined me. We stood in silence for a moment.
"Do you think it will work?" I asked.
He smiled. "Not the way we planned it."
We laughed. Not bitterly, but with something like relief.
This is, I have come to believe, the central problem with the way the Dutch engage with water management beyond our own borders. We arrive carrying assumptions we have never examined. In the Netherlands, floods are fear. Boundaries are rigid: water here, land there. In Bangladesh, floods bring life. Fresh sediments enrich the land. Traditional communities understand the delta as dynamic, fluid. Adaptation is not about stopping the flow; it is about moving along with it.
Sketching the logic, debating the data, and seeking the mandate. Credits: Author
And there is something even deeper we choose to ignore. In the Netherlands, we have an extraordinary trust in government, built over centuries of shared water management, and of knowing that if your neighbour's dike fails, yours fails too. We assume, when we export our solutions, that this social contract travels with them. It does not. In many of the places we work, the relationship between communities and the state is defined not by trust but by abandonment. People have learned to build their own resilience outside of any masterplan, including ours.
When we ignore this, we are not just making a technical error. We are making a human one.
Here is the detail that humbles me most. In one of our projects, we proposed dynamic polder management, allowing controlled flooding, moving with the water rather than against it. The Bangladeshi experts resisted. Too soft. Not infrastructural enough. They wanted embankments, gates, certainty.
Years later, the Netherlands adopted the same approach. We called it dynamic coastal management. Cutting-edge, innovative, distinctly Dutch. Our Gift to the World.
It was the same concept. The same logic Bangladesh had practised for generations.
Perhaps knowledge does not travel in straight lines. Perhaps it travels in loops.
When I returned to Dhaka after the conference, a colleague greeted me with a grin and a bag of bananas.
"For you," he said. "We remember."
It meant more to me than any conference applause.
I am still an engineer. I still believe in models, data, and technical expertise. But expertise without humility is just another way of not listening. And in a world where the people most affected by floods and rising seas are rarely in the room when decisions are made, not listening is not a neutral act.
The most important distance in this work is not the eleven hours between Rotterdam and Dhaka. It is the distance between your certainty and someone else's reality.
Travel the last 100 metres. Sit down. Strip away a little less. And pay attention to what was already there.
Willem van Deursen is a senior integrated water resources expert and founder of Carthago Consultancy, with over 25 years of experience using modeling at the interface of hydrology, policy, and livelihoods to improve people’s lives.
