Reply #5: We've definitely had half of that scenario. [View All]

[sofa king]

This is a picture of Great Falls (Virginia Side), about ten miles upstream from Washington, DC. The water is actually a little bit high in that picture.

Now take a look at this picture of a modest flood at Great Falls. It's taken from maybe fifty to a hundred feet upstream of the first picture.

Now scroll down to the pictures on this page of the high water post at Great Falls. Both of the pictures I linked above were taken from six to nine feet below the 1942 high water mark! Also on that page, you can see a shot of the Jefferson Memorial getting swamped by the same flood.

With the combination of tides (which strangely enough, DC has), this town could be completely wrecked by anything worse.