HOUSTON — The mayhem that Hurricane Harvey unleashed on Houston didn’t only come from the sky. On the ground, it came sweeping in from the Katy Prairie some 30 miles west of downtown.

Water drains naturally in this stretch of Texas, or at least it used to. At more than 600 square miles, Houston has grown to be as big as Chicago, Cleveland, Detroit and Philadelphia combined, a giant spread of asphalt smothering many of the floodplains that once shuttled water from the prairies to the sea. When finished, the newest road to ring the city and propel its latest expansion, called the Grand Parkway, will encircle an area equivalent to all of Rhode Island.

For years, the local authorities turned a blind eye to runaway development. Thousands of homes have been built next to, and even inside, the boundaries of the two big reservoirs devised by the Army Corps of Engineers in the 1940s after devastating floods. Back then, Houston was 20 miles downstream, its population 400,000. Today, these reservoirs are smack in the middle of an urban agglomeration of six million.

Many of the residents living in and around the reservoirs didn’t even know they slept in harm’s way — until the water came pouring in from the prairie during Harvey.

The story of Harvey, Houston and the city’s difficult path forward is a quintessentially American tale. Time and again, America has bent the land to its will, imposing the doctrine of Manifest Destiny on nature’s most daunting obstacles. We have bridged the continent with railways and roads, erected cities in the desert, and changed the course of rivers.

Built on a mosquito-infested Texas swamp, Houston similarly willed itself into a great city. It is the country’s energy capital, home to oil and carbon-producing giants, to the space industry, medical research and engineers of every stripe. Its sprawl of highways and single-family homes are a postwar version of the American dream.

Unfortunately, nature always gets the last word. Houston’s growth contributed to the misery Harvey unleashed. The very forces that pushed the city forward are threatening its way of life.

Sprawl is only part of the story. Houston is also built on an upbeat, pro-business strategy of low taxes and little government. Many Texans regard this as the key to prosperity, an antidote to Washington. It encapsulates a potent vision of an unfettered America.

Harvey called that concept into question. It may have been an unusually bad hurricane, dumping trillions of gallons of water in a few days, even more to the east of the city than to the west, in the prairie, and setting all kinds of records. But it was also the third big storm to slam Houston in three years, dispelling any notion that Houston shouldn’t expect more of the same.

One estimate puts recovery from Hurricane Harvey at $81 billion, much of which will end up shared by taxpayers across the country.

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A Houston Selling Point: It’s Not New York

At the same time, Houston is in many ways a forward-looking, progressive city. Before it elected Mr. Turner, it elected a mayor who was a lesbian. The city is in thrall to cars and highways and has precious little mass transit, but the municipality of Houston relies more on renewable energy than any other big city in America. Houston has more green space, relative to paved, than New York.

And what many Houston residents like about it, its supporters say, is precisely that it isn’t New York or San Francisco or Boston. They insist that its business-friendly, light-on-regulations approach helps account for a big rise in employment since 2000. A report by the city’s Center for Opportunity Urbanism, a pro-development organization, which cautions against overreacting to Harvey, said: “The city emanates a conviction that people should have the freedom to determine their destiny.”

Houston’s sprawl, and its dependence on the automobile, contributed to the misery that Hurricane Harvey unleashed.

Thomas Cole, director of the McGovern Center for Humanities and Ethics at the Texas Medical School of Houston, recalled how, during the 1960s, business leaders and politicians conspired with media executives to desegregate Houston quietly, seeing the turmoil that desegregation was causing elsewhere in the South. Decades later, Houston boasts of becoming the most diverse big city in the country, with comparatively low housing costs that translate to higher levels of minority homeownership.

But what does “affordable” really mean if residents have to pay hefty transportation costs and rebuild, time and again, after floods? Houston’s affordability leans on loosely regulated, low-cost immigrant labor providing an abundance of cheaply made, slab-on-grade, single-family houses that sprawl on all that open land, in areas like the Katy Prairie.

And it relies heavily on American taxpayers providing government tax credits, mortgage interest deductions, gas subsidies, artificially low flood insurance rates, highway construction money — and emergency relief, including buying out homeowners to remove their properties from harm’s way.

Harris County officials say they have received as many requests for buyouts since the hurricane (3,000) as there have been buyouts since the mid-1990s. Harvey turned out to be an equal opportunity disaster. In Meyerland, an affluent district where Brays Bayou burst its banks, Steve and Julie Sacks’s house flooded for the third time in three years. They are among the homeowners hoping for a buyout.

“But I’m not counting on one,” Mr. Sacks told me. Buying out rich homes to repurpose vulnerable areas like Meyerland for flood detention, as Mr. Sacks notes, would require loads of money and remove valuable properties from tax rolls in a county that relies on property taxes.

Bruce Hooper would move, too. During Harvey, he woke up to crackling sounds, when floodwaters started to seep into his appliances and electrical outlets. Mr. Hooper lives in a poor area called Kashmere Gardens. I found him sitting on a tattered lawn chair outside the shell of his tumbledown rental. An unemployed former parks employee, Mr. Hooper told me that he and his family of five had to be airlifted out by the Coast Guard after a detention pond overflowed and water inside the house rose from ankle to chest high in an hour. He would live elsewhere, he said, but like many others without flood insurance or savings, “we got nowhere else to go.”

Andy and Christine Kahan inside their damaged home in Bear Creek Village. “Welcome to the war zone,” Mr. Kahan said.

As for Andy and Christine Kahan, they were among thousands who had no inkling they were especially vulnerable before Harvey. The Kahans own a single-story home in a middle-class neighborhood, Bear Creek Village.

“The damn dam did us in,” Mr. Kahan said. The Kahans’s home was among those houses flooded by the reservoirs, which Harvey for the first time filled and threatened to overflow.

Christine Kahan and her husband had lived for 28 years in their house without a flood. Now Ms. Kahan said she would entertain a buyout. A part-time real-estate agent, she advises clients to think twice about buying any home that flooded. Hers is now one of them.

But Mr. Kahan says they will stay, for the time being. “I’m not a skeptic about climate change,” he told me. “It defies logic not to believe something is going on.”

I asked how that lined up with his desire not to leave Bear Creek. “Harvey was an exception, an act of God,” he said, then added, “I know it doesn’t make sense. But I’m an optimist.

“At least, I am until the next flood.”

Andy and Christine Kahan’s house in Bear Creek Village. Josh Haner/The New York Times

Weather at the Extremes for Texas

Will Houston be any more ready by then?

One afternoon I biked with Guy Hagstette around Buffalo Bayou Park. Mr. Hagstette is director of parks and civic projects for the Kinder Foundation, which underwrote much of the $75 million downtown park. We met at Allen’s Landing, where the Buffalo and White Oak Bayous converge before flowing into the Houston Ship Channel. The Allen brothers were real estate swindlers from New York who founded Houston in 1836. After oil turned up beneath the muck and clay, they seemed like prophets.

Harvey burst the tall banks of Buffalo Bayou Park, flooding the city’s theater district and City Hall. It collapsed riverbanks and left dunes of silt that buried pedestrian paths, playgrounds and fields.

“This will take a lot more than tweaking,” Mr. Hagstette told me. He meant not just repairing and fortifying the park, but also adapting Houston to the new normal.

For starters, that will require fresh numbers. Harris County demands that new developments retain enough rainwater on site to neutralize the effects of a 100-year storm. But those 100-year numbers date back years. They are based on mitigating a storm that averages 13.2 inches of rain in 24 hours. Harvey brought 25.9 inches in 24 hours. The Memorial Day flood dropped 11 inches in three hours. The Tax Day flood dumped 17 inches in 12 hours in the Katy Prairie.

“We need to get climatologists, politicians and policymakers talking to each other,” Jeff Lindner told me. “They’re not.” As meteorologist for the Harris County Flood Control District, Mr. Lindner spent five sleepless days and nights during Harvey as an unshakable, tousled expert in a blue, button-down shirt, going on television and providing Houstonians with useful information. We met at the flood control district office one morning.

“There’s little question the earth is warming,” he said, adding as a qualifier: “Regardless of whether it’s a natural cycle or human-induced, hotter air holds more moisture. And so for Harris County that means the potential for more extreme events.”

Mr. Lindner’s concern, he said, is that “by the time policy is in place it will already lag behind the latest information.”

Considering that most people whose homes flooded had no flood insurance, getting everyone to buy it might solve one problem — but would increase another. “We ought to call federal flood insurance what it actually is,” as Phil Bedient, an engineer and colleague of Mr. Blackburn’s at Rice, put it. “It is subsidized floodplain development.” The Netherlands — the global gold standard for water management — does not offer a national flood insurance program for just this reason.

Mr. Blackburn tells a story about a local hero, Jesse Jones, the former secretary of commerce, who helped secure federal funds for the ship channel. In 1929, Mr. Jones convinced fellow Houston bankers to put aside reserves of cash that prevented city banks from failing in the Depression. What may save Houston today, Mr. Blackburn said, is another common-sense strategy involving stricter controls and infrastructural investments that somehow lets state Republicans acquiesce behind closed doors but beat their chests in public.

“The worst flood has not yet occurred,” Mr. Blackburn noted. A hurricane that pushes a massive storm surge from the Gulf of Mexico into Galveston Bay, up the ship channel, could overwhelm refineries and unleash a toxic tsunami, killing many and rattling the national economy.

The judge and mayor are among those talking about a so-called Ike Dike, named after Hurricane Ike in 2008, which killed dozens in Texas. It would be a massive sea-gate that could block a surge. The scale and engineering would be Texas-size. The cost would be, too.

It’s hard to imagine that happening in the current political climate, Washington’s included, when so little gets done. “Looking back, should we have spent more to avoid some of the flooding?” Judge Emmett asked, rhetorically, when we met in his office. “Sure. Did taxpayers want to pay more to do those things? No.

“We need a whole new structure of governance,” he insisted. “We’ve built in watersheds, paved roads and highways because we don’t have mass transit.

“Inevitably, it all catches up with us,” the judge said. “Mother Nature has a long memory.”

Urban sprawl is only part of the story of Houston. The city was also built on an upbeat, pro-business strategy of low taxes and little government.

Follow Michael Kimmelman on Twitter at @kimmelman; and on Facebook at facebook.com/michaelkimmelman

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