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September 13, 2009

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David Hecht

Look, this business of crowd-counting--while not an exact science--isn't just guesswork either.

I watched the rally on the Mall on Glen Beck's show last night. Someone said that it's a mile from the Capitol to the Washington Monument, and that the intervening space was "filled with people".

OK, let's suppose that's true. Let's also assume that the frontage involved is about 100 feet (obviously you can insert your own, more accurate figure: I was doing this off-the-cuff). So that's ( 1 mi = ~5000 ft x 100 ft = ) about 500,000 square feet, "filled with people."

How much space does one person occupy in a crowd? They didn't look all that packed in to me, nothing like what you see at (say) parades. So say each person was taking up about a 2x2 or maybe 3x3 space. That would be about 4-9 sqft each. At 9 sqft/person, we're talking roughly 50-60,000 people (500,000 / 9). At 4 sqft/person, it would be about 125,000 people.

The obvious conclusion is that we are talking about roughly a hundred thousand people, but nowhere near a million, let alone two million.

Jethro

Here's how the Park Service does it:
http://www.usatoday.com/news/washington/2009-01-19-crowd_N.htm

They use 2.5 square feet, which seems small to me...well, maybe not. That's a radius of nearly 11 inches, which is similar to your 2x2 box but without the corners. But still 5/8 the area per person.

Also, the Mall is more like 500 feet across (the picture Malkin posted of the crowd from the webcam shows Pennsylvania Ave, which is about 100 feet across though). That's almost a factor of ten between the two though and could start pushing a million. From the USA Today pic, 1.2 million is doable, maybe more if it spills out past the Monument and with stragglers on Pennsylvania Ave. Really should wait for better air pics though.

bailey

I was there. I think the 60-70,000 estimate that the fire department gave sounds right. Even Fox and the Washington Times say tens of thousands. And none of the higher figures that I have seen are backed up by sources.

Also, I live in DC, which has a population of about 550,000. There is just no way that there were an extra 500,000 people here yesterday, much less millions. In my neighborhood, which is less than a mile from the White House, there was no effect whatsoever -- no people with signs or t-shirts, no extra cars, just a typical Saturday. During the Inauguration, it was obviously busier and more crowded.

Mike in Green Bay

0.3 x 1.4mi = (1584ft x 7392ft) = 11,708,928 ft^2 (Mall)

346yds x 1.07mi (1038ft x 5649.6ft) = 5,864,284.8 ft^2 (Pennsylvania Ave)


11,708,928 + 5,864,284.8 = 17,573,212.8ft^2 total

assume 2.5ft x 2.5ft area per person = 6.25 ft^2/person


17,573,212.8ft^2 / 6.25 ft^2/person

2,811,714.048 people MAX

Cut this into 1/3 for error, voids, buildings, etc.---> 937,238

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