A science columnist reflects on a city made possible and made vulnerable by reliance on technology.
"New Orleans has not had river water in its streets for more than a century. But the river is not the only threat to the cityâ€"and this was already well known even before Hurricane Katrina made it painfully clear at the end of August.
...Experts on hurricanes and on New Orleans say that no one should have been surprised by the impact of Katrina on the city... Computer models constructed by workers at the Louisiana State University Hurricane Center predicted that a storm of Katrina's strength would produce "back door" flooding from Lake Pontchartrain and the canals. In 2002 a prescient series of articles by John McQuaid and Mark Schleifstein, published in The New Orleans Times-Picayune, brought the results of those simulations to public attention.
...Given the century-long history of "back door" flooding in New Orleans, the Corps of Engineers and other flood-control agencies may well be criticized for devoting too much energy to the Mississippi River while neglecting the hurricane hazard. But in fact the river remains the greatest force of nature in the region. Before Katrina, the worst disaster in Louisianaâ€"and one of the worst in the nation's historyâ€"was the Mississippi flood of 1927, in which nearly a million people were forced from their homes. In that case the city of New Orleans was sparedâ€"but only by dynamiting a levee downstream, wiping out much of Plaquemines Parish."
FULL STORY: Natural and Unnatural Disasters

Rethinking Redlining
For decades we have blamed 100-year-old maps for the patterns of spatial racial inequity that persist in American cities today. An esteemed researcher says: we’ve got it all wrong.

Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

California High-Speed Rail's Plan to Right Itself
The railroad's new CEO thinks he can get the project back on track. The stars will need to align this summer.

Savannah Reduces Speed Limits on Almost 100 City Streets
The historic Georgia city is lowering speed limits in an effort to reduce road fatalities.

A Park Reborn: Resilience and Renewal in Fire-Stricken Altadena
Rebuilt in just two months after the devastating Eaton Fire, Loma Alta Park now stands as a symbol of community resilience and renewal, even as some residents hope recovery efforts will continue to support housing stability and long-term equity.

Spain Moves to Ban 66,000 Airbnbs
The national government is requiring the short-term rental operator to remove thousands of illegal listings from its site as part of an effort to stem a growing housing crisis.
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
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