In my last post, I wrote about the Dutch Way, the habits of directness, consensus, and warmth that shape how the Dutch manage water. This time I want to look at a harder, more technical difference between our two countries, one that came up in almost every briefing on this NAFSMA trip. The Dutch build to a level of protection most Americans can barely imagine, and they will tell you frankly that crisis response is their weak spot. We tend to do the opposite.
The Dutch Bet on Prevention
For decades after the 1953 flood, Dutch dikes (levees) were built to hold back water levels expected only once in 1,250 to 10,000 years, with the highest standards reserved for the heavily populated coast of North and South Holland. In 2017, the Dutch went further and changed what the standard measures. The new rule starts from people rather than water levels. Every person living behind the dikes or dunes is entitled to the same base protection: an annual chance of dying in a flood of no more than 1 in 100,000. That target is then translated into a required failure probability for each stretch of dike, ranging from 1 in 300 up to 1 in 1,000,000 where a failure would do the most damage.
The deadline is 2050, and the Dutch are not there yet. Of the roughly 9 million people living behind a primary flood defense, about 80 percent had the base level of protection in 2020. They are paying for the rest. Through 2050, the Delta Fund (the national fund for Dutch water infrastructure) expects to have about €29 billion available for the Delta Programme, against estimated costs of about €38 billion.
The Dutch Are Candid About the Weak Spot
The Dutch are open about the other side of that bet. In 2008, the Dutch government told its parliament that, in a worst credible storm-surge scenario, the coastal areas could not be evacuated preventively in the 48 hours before the flood. Evacuation is also built into the math behind the new standard: the allowable flood probability for each dike is calculated using the expected share of people who would evacuate and the expected mortality. Put simply, where people can’t get out, the dikes have to be stronger.
The Dutch have been working on the gap. Since 2009, their policy framework has been “multi-layer safety” (meerlaagsveiligheid). The first layer is prevention (dikes and room for the river), the second is spatial planning (flood-proofing and elevating buildings), and the third is crisis management (warning and evacuation). But prevention still dominates, both in practice and in public perception.
America Bets on Response
In the United States, the national benchmark is far lower. The National Flood Insurance Program is built around the 100-year flood, an event with a 1 percent chance of occurring in any year, and that benchmark has shaped what many communities build. After Katrina, New Orleans received a $14.5 billion system designed to withstand a 100-year storm surge. When local officials pressed for 200-year protection, the Corps’ own analysis found that the 100-year system returned $2.50 in avoided flood costs per dollar spent, compared to $2.30 for a 200-year system. Corps modeling also showed that a 500-year event would still leave much of the city under five feet of water.
That is not the whole story, though. Some American communities have deliberately aimed higher. Since 2007, California has required new urban development in the Central Valley to meet a 200-year “urban level of flood protection,” and local agencies there have spent years building toward it. St. Louis built its floodwall to hold back a 52-foot river stage, and when the Mississippi crested at 49.6 feet in 1993, the wall held. Communities like these show that higher standards are achievable here. The challenge is that they remain the exception rather than the rule.
What America does have everywhere is a formidable response system. Since the 1940s, the Corps has had authority to fight floods, including sandbagging and building temporary levees, and to repair damaged nonfederal levees. According to the Government Accountability Office, the Corps spent more than $34 billion on disasters from fiscal year 2006 through fiscal year 2025. FEMA’s Disaster Relief Fund, which covers all types of disasters, recorded about $52 billion in obligations in fiscal year 2025 alone. I’m not aware of any country that moves people, supplies, and money into a disaster zone the way the United States does.
The Case for Balance
Here is my position. The United States needs higher standards. For a major city, 100-year protection should be treated as a floor, not a goal. The benefit-cost rules that keep many places at that floor undervalue lives, the cost of rebuilding, and the damage a catastrophic flood does to a regional economy. Protection is not a business case; it is a human values case. The communities that have pushed beyond 100-year protection deserve credit, and the rest of the country should follow them toward 200-year protection and beyond, and toward the Dutch habit of setting standards based on risk to people.
But we cannot trade away our response capacity to get there. The Dutch themselves are working to strengthen the crisis-management layer they neglected for decades, while we are debating whether to weaken ours. In May, the President’s FEMA Review Council recommended shifting much more disaster response and recovery responsibility to states and localities. That recommendation came after FEMA absorbed roughly a 14 percent workforce reduction since January 2025 and a record 76-day lapse in its parent department’s funding. Better levees reduce how often we need a response, but they never eliminate that need. Every levee can be overtopped, and every system has a larger storm waiting somewhere in its future.
The Dutch built a country that almost never floods, and they are now learning how to respond when it does. America built a response system second to none, and too many of our communities still need to learn how to flood less. Each of us has half the answer. The goal should be to have both.