In 2011, a tsunami slammed into the Japanese coast. Waves taller than buildings swallowed entire towns. In Fudai, a village of about 3,000 people, the water came. But it stopped. Not because of luck. Because of a decision made 40 years earlier — one that was mocked, ridiculed, and called the biggest waste of public money in the region.
The floodgate was called a monument to government waste. Until it became the only thing between 3,000 people and certain death.
Kotaku Wamura was the mayor of Fudai in the 1970s. After a typhoon caused flooding, he became obsessed with building a massive floodgate. He pushed through a 3.6 billion yen project — a wall 15 meters high with gates that could close the valley. Locals called it “Wamura’s Folly.” They said it was unnecessary, ugly, and a waste of taxes. For decades, the floodgate sat closed, unused. People forgot why it was there. Some wanted it torn down.
Then March 11, 2011, happened. The tsunami hit Fudai with waves that reached 15 meters. The floodgate, closed in time, held. The village behind it survived. Only one person died (from a heart attack, not the water). In neighboring towns, thousands perished.
After the disaster, the ridicule turned to reverence. But the story is not just about a heroic mayor. It’s a cautionary tale about how we judge preparation.
We celebrate foresight only when the disaster arrives. But the real test of foresight is that it never gets to prove itself.
This is survivorship bias in action. If the 2011 tsunami had hit further south, Fudai’s floodgate would still be a laughingstock — a case study in government waste. The very thing that made it a success — the disaster — was the only thing that could justify its existence. But the mayor had no way of knowing that a tsunami would come. He just knew that the cost of being wrong was too high.
This is the uncomfortable truth about long-term planning: We are terrible at valuing protection that never pays off. We demand ROI on safety. We want to see results. But the best catastrophe prevention is invisible. It’s the vaccine that prevents outbreak, the seawall that never gets wet, the pandemic stockpile that rots unused.
What does this mean for you? Whenever you make a decision to invest in safety, resilience, or preparation — whether it’s a backup system, an insurance policy, or a climate adaptation — you are choosing to be ridiculed for something that might never be needed. That’s the price of responsibility.
The most expensive infrastructure in the world is the one you never need. But the most tragic is the one you wish you had built.
Fudai’s floodgate stands as a monument not just to survival, but to the courage of spending money on something that might never be used. The next time you see a “wasteful” project, pause. Maybe it’s not waste. Maybe it’s the only thing standing between you and disaster.
FAQ
Q: What if the tsunami hadn't hit Fudai? Wasn't the money wasted?
A: No. The purpose of the floodgate was to prevent a catastrophe. The fact that it didn't happen doesn't mean the investment was wasted — any more than a fire extinguisher is wasted if your house doesn't burn down. The problem is our bias: we only see the cost, never the avoided disaster.
Q: How can we justify long-term investments when there's no immediate payoff?
A: Use scenario planning and calculate the expected value of prevention. Even a small probability of a huge loss can justify large spending. Also, build narratives that make the invisible visible — like Fudai's story — to help people grasp the value of preparation before the crisis.
Q: Isn't this just survivorship bias? The story is cherry-picked. Many 'wasteful' projects are actually wasteful.
A: Exactly — it's a double-edged sword. The story is a perfect example of survivorship bias: we only celebrate preparations that worked. But that's the point: we need to learn to value the preparation that never gets to prove itself, even when it's mocked. The real lesson is not about Fudai's mayor — it's about our own flawed judgment.