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Tag Archives: flooding

Palm

Still dealing with the impact of Hurricane Sandy, I keep pondering the cost of preparing for the next storm. Personally, it has been worth purchasing a generator. But, what to do about my neighbor?

Located a half mile from my home, he has many beautiful old huge trees that were destabilized by the storm. Just a week ago, one tumbled down onto a power line during a rainstorm and eliminated our power for 6 hours until repair crews hauled the debris away. However, when asked to engage in further disaster prevention and cut down whatever remaining limbs threaten power lines, he refused.

Similarly, for my power company, it is much cheaper to clean up after a storm than to prepare for it. In NYC, Consolidated Edison (Con Ed) expects to spend $450 million cleaning up storm damage. And, when the Sandy relief bill passes Congress, I expect they will get some of the money. By contrast, storm prevention, including underground wires and elevated substations, would cost Con Ed 100 times as much.

So, if we focus on their private cost, it makes sense for my neighbor and Con Ed to do minimal disaster damage prevention. For them, prevention is much more expensive than clean-up.

But what if we move beyond and look at the “social” cost?

The entire cost benefit equation changes when we add the cost to society. Then, we include fatalities and storm related illness, lost work days, longer commuting times, school cancellations, lower retail sales, lower stock prices of retailers and even the diminished value of pension funds that hold those retail stocks. You see where I am going. The impact of Sandy has a far reaching ripple. Her cost has been huge.

The private cost of prevention is much greater than the private cost of clean up. However, the results might be reversed if we look at the private cost+social cost. Then, does prevention make sense? And if so, what should I do about my neighbor?

Sources and Resources: For more reading about the intricacies of disaster prevention, I suggest the NY Times article, “Hurricane Sandy Alters Utilities’ Calculus on Upgrades” and James Surowiecki’s New Yorker column, “Disaster Economics.”

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How much should cities plan for the storm of the century?

In NYC, the last time that the East River touched the Hudson River (see below) was on September 3, 1821 when a hurricane struck directly and the tide rose 13 feet in one hour. Should the city plan for it to happen again?

Along its 520 mile long coastline, New York’s waters have eased upward at an inch a decade, a rate that some say is accelerating. If so, by 2050, another 2 feet might be added. Although not below sea level, New York is vulnerable. A direct hurricane hit could mean subways flooded for weeks, basements inundated, electricity out, undrinkable water, commuter transport lines incapacitated.

Assessing the unlikely probability that a massive storm would directly hit New Orleans, in 1978, economists recommended a relatively low level of levee protection. Using rational cost benefit analysis, the question was where to allocate the city’s limited resources. They had no crystal ball–just some logical decision making that did not work out.

New York has some of the same dilemmas. When it equips subways with better flood protection like higher ventilation grates, then the same money cannot be used for new subway cars. Consolidated Edison says it would need $250 million for submersible switches and above ground high voltage equipment and other flood appropriate retooling. Green roofs? Sea gates? Water permeable bike paths? Stop all waterfront development? They did install porous riprap rock in Brooklyn. (???I have no idea what this is but the name is great).

You see where this is going. If a catastrophic storm hits the city, people might say the cost was immense. However, using classic opportunity cost reasoning, don’t the benefits of minimal action outweigh any benefits we enjoy if we mobilize for the storm of the century now?

This NYC site has a complete hurricane history for the city. Most of my facts about the city’s planning for a devastating flooding event are from this NY Times article. Also, I suggest looking at this EconLife post on cost benefit and pre-Katrina planning. Looking at this Congressional Report on Hurricane Katrina might provide more insight about current NYC decisions and Japan’s lack of planning for her recent nuclear plant catastrophe.

When the 1831 storm hit, the East River, extending down the right side of Manhattan met the Hudson River located west of the city.

Manhattan Island is bordered by the East River (east) and the Hudson River (west).

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